University of Shanghai for Science and Technology, China
Professor SongLin Zhuang, was born in 1940. In 1995, he was selected as academician of the Chinese Academy Engineering. Currently, he is the dean and professor of the School of Optical-Electronics and Computer Engineering, University of Shanghai for Science and Technology. He also works as a visiting professor in Tsinghua University, Shanghai Jiaotong University, Fudan University, and Zhejiang University. He is the fellow of International Society of Optical Engineering, Optical Society of America, honor chairman of China Instrument and Control Society, council member of the Chinese Optical Society, specialist of China's Lunar Exploration Project, associate director of Higher Education Instrument Science and Technology teaching Steering Committee (Ministry of Education). His research interests are graded refractive index optical materials, theory of vector mode status for grating diffraction, optical supperresolution imaging metamaterials and high-density optical storage technology. He is the pioneer of CAD for optical system in the country and he is acclaimed as “one of the most contributor for modern white-light optical information processing”. In recent years, he leaded his team in developing the active terahertz body security inspection system and the terahertz time domain spectroscopy system for detection of the organics. His terahertz laboratory recently was approved “Cooperative Innovation Centre of Terahertz Science”by Shanghai government, which is more than 10,000 m2. Furthermore, two doctors instructed by him have been chosen as“the National 100 excellent PhD thesis”and nomination of “the National 100 excellent PhD thesis”in 2009 and 2013.
Speech title: Terahertz Spectroscopy and Imaging Technology: From Source to System
Abstract: The vibration and rotation frequencies of some organic and bio molecules are located in terahertz region. Therefore, by using terahertz spectroscopy technology, the macro-organic material can be detected and identified. Furthermore, because of the good transmission and low photon energy, terahertz wave is also considered as an option for homeland security check. m-i-n diode based on intrinsic GaAs for terahertz emitter is fabricated by University of Shanghai for Science and Technology (USST), whose operation frequency can reach 4.2 THz. Furthermore, some terahertz functional devices are also developed, i.e., broadband high efficiency terahertz absorber, whose absorption can be more than 95% from 0.6-2.6 THz. Based on the above terahertz emitter and functional material, an fast scan and fiber based terahertz spectroscopy system is fabricated. The system can realize 0.1 s/spectrum scan for drug functional group identification and cancel cell detection. Moreover, an active terahertz imaging system for homeland security is also developed. The system is based on multi detectors and fast vibration scan mirror, which can realize a scan ~1.3 s/ person with the resolution about 1.5 cm.
David J. Brady
Duke University, USA
David J. Brady is the Fitzpatrick Family Professor of Photonics at Duke University and Professor of Electrical and Computer Engineering at Duke Kunshan University. Professor Brady is the author of the text “Optical Imaging and Spectroscopy” and is a fellow of IEEE, OSA and SPIE. He won the 2013 SPIE Denis Gabor Award for his work on compressive holography. He has developed numerous computational imaging systems for visible, infrared, x-ray and millimeter wave applications. His work has focused particularly on compressive tomography and on hyperspectral imaging. In 2012, Brady and his team developed the world’s first terrestrial gigapixel camera.
Speech title: Resolution and Camera Size, Weight and Power
Abstract: Parallel optical and electronic processing enables gigapixel-scale cameras. This talk reviews recently developed gigapixel cameras and considers current and future limits on camera pixel capacity as a function of size, weight and power. Using multiscale lens designs, it is possible to build cameras resolving more than 10 gigapixels per liter camera volume. However, the electronic processing volume in current gigapixel cameras exceeds optics volume by more than 10x. We consider novel processing architectures and algorithms to reduce electronical power and volume requirements.
Utrecht University, Netherlands
Allard Mosk (1970) started his physics career in ultra-cold atomic gases with work in Amsterdam (Ph.D. 1994), Heidelberg, and Paris, performing the first observation of a Feshbach resonance in Li, and of photo-association of H. In 2003 he joined the nano-photonics group of Ad Lagendijk and Willem Vos at the University of Twente where he pioneered wave-front shaping methods to focus and image through strongly scattering media. In 2015 he was elected Fellow of the Optical Society (OSA). Since 2015 he leads a group at Utrecht University, The Netherlands, where he studies statistical properties of light in complex scattering media with a view on imaging and metrology.
Speech title: Imaging and Metrology Using Scattered Light
Abstract: Random scattering of light, which causes the opaqueness of paper, paint and biological tissue is an obstacle to imaging and focusing of light. Scattered laser light produces random interference patterns, known as speckle, that contain scrambled information pertaining to the environment of the scatterers, and that make imaging difficult. On the other hand, in some systems scattered light gives access to information that cannot be obtained through ballistic light. For example, scattering can increase the effective numerical aperture of an optical system and thereby improve the resolution. To be able to use this information the scattering should be carefully controlled and characterised. I will show several recent methods to use information to control and focus focus scattered light and to use scattered light to obtain relevant information and images.
National Taiwan University, Taiwan, China
Professor Din Ping Tsai received Ph.D in Physics from University of Cincinnati, USA in 1990. He worked at Microlithography Inc., California, USA; Ontario Laser and Lightwave Research Center, Toronto, Canada; and National Chung Cheng University, Taiwan from 1990 to 1999. He joined Department of Physics, National Taiwan University as an Associate Professor in 1999, and became Professor and Distinguished Professor in 2001 and 2006, respectively. He served as the Director General of the Instrument Technology Research Center (NARL) located in Hsinchu Science Park, Taiwan from 2008 to 2012. He is the Director and Distinguished Research Fellow of Research Center for Applied Sciences, Academia Sinica since 2012. He is a Fellow of AAAS, APS, IEEE, OSA, SPIE, TPS and Electro Magnetics Academy. He is also Academician of Asia Pacific Academy of Materials and Corresponding Member of International Academy of Engineering (IAE). He currently serves as Editor of Progress in Quantum Electronics, Associate Editor of Journal of Lightwave Technology, Member of Editorial boards of Physical Review Applied, Applied Physics Letters Photonics, Optics Communications, Plasmonics, ACS photonics, Small Method and Optoelectronics Letters, respectively. He is now the President of Taiwan Information Storage Association. He was the Director of the Board of SPIE and Member of IEEE/LEOS Nanophotonics Committee; OSA Fellows & Honorary Members Committee; SPIE Fellow Committee; IEEE Joseph F. Keithley Award Committee; OSA and IS&T Edwin H. Land Medal Committee; respectively. He was also President of Taiwan Photonics Society; Chairman of IEEE Instrument and Measurement Society Taipei Chapter; and Chairman of the SPIE Taiwan chapter.
Speech title: Metasurface for Photonics Application in Demand
Abstract: The functionalities of traditional optical component are mainly based on the phase accumulation through the propagation length, leading to a bulky optical component like lens and waveplate. Metasurfaces composed of two-dimensional (2D) artificial structures have attracted a huge number of interests due to their ability on controlling the optical properties including electromagnetic phase as well as amplitude at a subwavelength scale. They therefore pave a promising way for the development of flat optical devices and integrated optoelectronic systems. In this talk, important research topics for photonics applications based on metasurfaces will be performed and discussed. Examples of Beam deflection, muti-dimensional holographic imaging, versatile polarization generation and analysis, multi-functional and tunable metadevices, engineering non-radiating anapole mode in free space and achromatic metasurface devices will be shown.
Utsunomiya University, Japan
Yukitoshi Otani is a professor of Department of Optical Engineering, Utsunomiya University, JAPAN. He received his doctor's degree from the University of Tokyo in 1995. After working for a brief period at HOYA Corp., he worked at Tokyo University of Agriculture and Technology as a research associate and an associate professor until 2010. He was a visiting professor at College of Optical Sciences, the University of Arizona from 2004 to 2005. He joined the Center for Optical Research and Education(CORE), Utsunomiya University as a professor from April 2010. His current interests include polarimetry, interferometry, optical measurement and optomechatoronics. He is a SPIE fellow from 2010. He was a board member of the Japan Society for Precision Engineering from 2013 to 2016, the general chair of the International Symposium on Optomechatronic Technology, ISOT 2016 and the general char of the Optics and Photonics Japan, OPJ2016. He is working the head of Polarization Science and Engineering Group in OSJ from 2015.
Speech title: Real-Time Phase Analysis of A Bio Sample by Differential Interference Contrast Microscope Using Pixelated Polarization Camera
Abstract: A polarization technology has become important in the field of optical science and engineering. We have proposed a new technology by a differential interference contrast (DIC) microscope with a polarization camera which has a linear micro-pixel polarizer array in adjacent 4 pixels aligned to 0, 45, 90 and 135° of azimuthal direction. It shows a real-time analysis for phase and amplitude of a transparent material. Tyo’s algorithm is employed to increase a spatial resolution of the polarization camera. We demonstrated to measure real-time phase distribution inside of an alive fish and its egg as bio-samples and succeeded to show a 3D reconstruction of a blood vessel, a beating heart and a backbone of a Medaka fish as same as a confocal microscope without staining method.
Utsunomiya University, Japan
Okihiro Sugihara received the D.E. degrees in electrical engineering from Keio University, Yokohama, Kanagawa, Japan, in 1991. He was a Research Assistant and an Associate Professor at Shizuoka University, Hamamatsu, Japan, where he worked on organic nonlinear optical devices. In 2003, he joined Tohoku University, Sendai, Japan, where he was engaged in polymeric lightwave devices. In 2014, he joined Utsunomiya University. He is currently a professor at the Center for Optical Research and Education, Utsunomiya University. Dr. Sugihara is a project leader of “Optical Interconnect Devices Using Photonic Polymers”, JST, Japan.
Speech title: Gigabit and Multigigabit Optical Transmission System Using Multimode Optical Fibers for Next Generation In-Vehicle Communication
Abstract: With a demand of high bandwidth in-vehicle network, optical fiber is a potential candidate to realize gigabit and multigigabit data transmission for the purpose of future advance driver assistance system and autonomous driving. We are now engaging in an international standardization and dissemination project for high-speed communication network performance over multimode optical fibers. Recent research and standardization progress of components and system for such ultrahigh bit-rate optical transmission will be presented.
University of Shanghai for Science and Technology, Shanghai
Sen Han obtained his Ph.D.in Optical Engineering from University of Stuttgart, Germany. Dr. Han is a Professor of University of Shanghai for Science and Technology and one of Co-Founder of H&L Instruments. He is both a SPIE Fellow and an Adjunct Professor of University of Arizona, USA. Dr. Han won R&D 100 Awards twice in USA.
Speech title: Transmitted Wavefront of Multiple-Wavelength Expressed by Related Zernike Coefficients
Abstract: Wavefront aberration can reflect the performance of optical systems, the test of wavefront aberration is convenient to express in Zernike polynomials form. Transmission optical system wavefront changes with wavelength, testing at design wavelength is critical for the optical system, from now on only a few wavelength wavefront can be tested by laser interferometer. A new idea is put forward in this paper, transmission optical system wavefront can be calculated at any wavelength utilizing the relationship between transmitted wavefront Zernike coefficients and wavelength. The optical system was modeled and Zernike coefficients at different wavelength were collected by Zemax, then the coefficients were fitted by Matlab curve fitting tool, finally we found Conrady-Zernike formula. The maximum error of the calculated Zernike coefficients is within 1%. The results show that the Zernike coefficients and the wavelength are basically consistent with Conrady-Zernike formula.
Shanghai Institute of Optics and Fine Mechanics, China
Guohai Situ is a professor with the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, holding a “1000 Talents Plan” professorship. Before he joined this institute in late 2012, he spent about 6 years working in University College Dublin in Ireland, Universität Stuttgart in Germany, and Princeton University in the United States, after he obtained his Ph. D degree from the Chinese Academy of Sciences in 2006. Dr. Situ's research interests span a wide field of computational optical imaging, ranging from developing novel techniques and algorithms for phase retrieval, to actively engineering the phase for computational optical imaging and optical signal processing. He has published 44 papers in leading journals including Nature Photonics. His papers have been cited over 2200 times according to Google Scholar. Dr. Situ is in the editorial boards of Scientific Reports, Advanced Optical Technologies, and Applied Optics.
Speech title: Computational Imaging: When Optics Meets Deep Learning
Abstract: In this presentation, I will talk about the applications of deep learning technique in the field of optical imaging. I will first introduce the basic concept of deep learning, and then talk about three use cases: i.e., how deep learning can be used for image reconstruction in computational ghost imaging, imaging through opaque wall, and digital holography.
University of Stuttgart, Germany
Speech title: How to Design an Optical Measurement System with Outstanding Performance?
University of Stuttgart, Germany
Speech title: Flexible Interferometry for Freeform Testing
Abstract: Precision optics requires metrology as feedback in the production chain. The plentitude of metrology approaches that have been proposed for aspheres suggests that there is no one perfect instrument that covers all requirements. Complexity and variety increases even more in the field of freeform optics. In this contribution, we review the development of interferometric techniques towards freeform optics capability. We show how the transition from two- to four dimensional instrument calibration enhances instrument flexibility.
Utsunomiya University, Japan
PhD received in 1980 from University of Tokyo. From 1970 to 1983, Researcher in ROKEN Institute of Physical and Chemical Research. From 1983 to 2007, Associate and Full Professor in Tsukuba University. Professor and Director of Center for Optical Education, Utsunomiya University from 2007 to 2017. From 2017, Project professor in Utsunomiya University. SPIE Board Member from 2011 to 2016. 2015 President of SPIE. Fellow of SPIE, OSA and JSAP. 2017 Winner of Dennis Gabor Award.
Speech title: Full Viewing Angle 3D Display by Computer Generated Holography
Abstract: A basic spectral relation between a 3-D object and its 2-D diffracted wavefront has been derived by interpreting the diffraction calculation in the 3-D Fourier domain. Information on the 3-D diffracted object is clearly understood by using this relation. After the derivation, a method for obtaining the Fourier spectrum that is required to synthesize a hologram with a realistic sampling number for visible light is described. Some fast calculation methods for the diffraction calculation, including the hidden surface removal are discussed. In order to verify the validity and the practicality of the above-mentioned spectral relation, fast calculation of a series of wavefronts radially diffracted from a 3-D voxel-based object is demonstrated. A method for a continuous optical rotation compensation in a time-division-based three dimensional display with a rotating mirror is presented. Finally, we will propose the use of a parabolic mirror to expand the viewing zone for 3-D display.
Utsunomiya University, Japan
Speech title: Holographic Control of Femtosecond Laser Pulses for Material Laser Processing
University of Liverpool, UK
Dr. Shen received his PhD degree from Nanjing University in 1992. After that he held various positions at Southeast University, Heidelberg University and Cambridge University. Currently he is a full professor at the University of Liverpool. Dr. Shen has been working on terahertz-related technology for many years, first as a Research Associate (2001-2004) at the Cavendish Laboratory, University of Cambridge, and then as a Senior Scientist (2004-2007) at TeraView Limited, Cambridge. He served as the TPC Chair of the 10th UK/Europe-China Workshop on Millimetre-Waves and Terahertz Technologies in 2017. Dr. Shen has been awarded 7 patents and published 5 book chapters and over 180 conference & journal publications with over 4700 combined citations and an h-index of 37. His current research interests include the development of novel THz and infrared imaging technologies with a focus on the exploitation of their applications in industry and science.
Speech title: Online monitoring and off-line inspection of pharmaceutical pellet coatings using optical coherence tomography and THz imaging
Abstract: The terahertz (THz) region of the electromagnetic spectrum spans the frequency range between the mid-infrared and the microwave. Over the last decade or so, THz technology has advanced considerably with THz imaging instruments now commercially available. One of the distinct features of THz imaging is its 3D imaging capability, seeing not only the surface features but also the internal structures of a sample. On the other hand, in the near-infrared region optical coherence tomography (OCT) has also proven to be a non-invasive and cross-sectional imaging technique that permits, for example, 3D images with micrometre resolution to be obtained. In this talk, I will present our recent work on the development of an integrated THz and OCT online sensor for intelligent monitoring of high-value manufacturing and a novel OCT sensor for healthcare applications.
University of Fukui, Japan
Prof. Motoharu Fujigaki received his BE and ME degrees in mechanical engineering from Osaka University in 1990 and 1992, respectively. He received his doctoral degree from Osaka University in 2001. He was working in NABCO Ltd. from 1992 to 1995. He moved to Department of Opto-Mechatronics, Faculty of Systems Engineering, Wakayama University in 1995 as a research associate. He became an associate professor in 2003. He moved to Human and Artificial Intelligent Systems, Graduate School of Engineering, University of Fukui as a full professor in 2015. He is interested in optical metrology using image processing, especially 3D shape measurement using gating projection method, deformation measurement using phase analysis method used for structural health monitoring and small displacement and strain distribution measurement using laser interferometry.
Speech title: Camera Calibration-free 3D Shape Measurement Using Grating Projection Method
Abstract: Authors proposed a feature quantity type whole-space tabulation method (F-WSTM) as a camera calibration-free 3D shape measurement. 3D shape measurement using grating projection method is useful method for many fields. However, the method is not robust for vibrating of the measurement device. Especially, the optical positions of an imaging sensor and lenses are deformed easily owing to vibration. The F-WSTM overcomes these weak points. In this paper, the principle and the experimental result are shown.
University of Connecticut, USA
Dr. Guoan Zheng received his Ph.D. degree from Caltech in 2013. He is currently an assistant professor at the University of Connecticut. He is the recipient of Lemelson-MIT Caltech Student Prize for his development of chip-scale microscopy platforms in 2011. He also received the Caltech Demetriades Thesis Prize for his development of Fourier ptychography technology in 2013. His current research focuses on the development of novel imaging and sensing techniques for biomedical applications. Dr. Zheng has been awarded 10 patents, published 1 book and over 70 conference & journal publications. The Fourier ptychography developed by him and his colleagues has been written into the famous textbook, Introduction to Fourier Optics (4th edition) by Goodman.
Speech title: Fourier ptychographic imaging
Abstract: Fourier ptychography (FP) is a recently developed phase retrieval technique for wide-field, high-resolution imaging. This technique stitches together many variably illuminated, low-resolution measurements in the Fourier space to expand the frequency passband and recover the high-resolution complex sample image. Without involving any mechanical scanning, it facilitates gigapixel imaging in a simple and robust manner. In this talk, I will discuss the principle of the FP approach and its applications in microscopy, quantitative phase imaging, 3D holographic imaging, and macroscopic imaging. I will discuss how to extend the FP approach for other imaging settings. The FP innovation may provide new insights for the development of high-resolution, high-throughput imaging platforms using photon, X-ray, and electron.
The Hong Kong Polytechnic University, Hong Kong, China
Dr. Wen CHEN received PhD degree from the National University of Singapore in 2010. Dr. Chen conducted extensive research as Research Associate (2010) and Research Fellow (2011-2015) in the Department of Electrical and Computer Engineering of the National University of Singapore. He was a visiting scholar in Rowland Institute, Harvard University, U.S.A. from March 2013 to June 2013. Dr. Chen is currently an Assistant Professor in the Department of Electronic and Information Engineering, The Hong Kong Polytechnic University. Dr. Chen has published more than 80 international journal and conference papers, and some publications have been highlighted or reported, such as AIP press release. He currently fulfils some professional services, such as an Editorial Board Member for “Scientific Reports” Journal, an Associate Editor for “IEEE Access” Journal and an active reviewer for many important journals in his research field. He was recognized as an outstanding reviewer for OSA publishing (Optical Society of America) in Aug. 2016. He actively attended academic activities, and was awarded to attend Global Young Scientists Summit @ Singapore One-North 2014. Dr. Chen's current research interests focus on imaging systems, single-pixel imaging, coherent diffractive imaging, optoelectronic systems, phase retrieval, digital holography, computer-generated hologram, microscopy, information optics, signal/image processing, big data, machine/deep learning, and compressed sensing.
Speech title: Novel applications using ghost imaging principles
Abstract: Single-pixel ghost imaging principles have attracted much current attention in various applications, e.g., optical encoding, imaging through scattering media, and remote sensing. In this invited talk, the novel applications using single-pixel ghost imaging principles are presented and discussed, e.g., optical encoding and decoding, optical authentication and high-quality object reconstruction. It is hoped that this invited talk could shed some light on the further developments of single-pixel ghost imaging principles for more applications.
Iowa State University, USA
Dr. Beiwen Li is an Assistant Professor of Mechanical Engineering at Iowa State University. He received his Ph.D. from Purdue University in August, 2017. His research interests include experimental mechanics, 3D optical sensing, multi-scale optical metrology, machine vision, and bio-photonic imaging. He has published 18 journal papers and co-authored two book chapters. Two of his journal papers were highlighted on the cover page of Applied Optics and Optics Express. Dr. Li received different awards including Dean’s Fellowship from Iowa State University and the Lambert Fellowship from Purdue University. Dr. Li was also the recipient of the Optics and Photonics Educational Scholarship of SPIE.
Speech title: Superfast Photomechanics Testing of Robotic Flapping Wings
Abstract: The flapping flight study is important to a variety of fields including biology, aerospace engineering and robotics. Over the years, the flapping flight study has been enhanced with experimental tools such as high-speed 3D imaging with photogrammetry. However, dense full-field mechanics testing of flapping wings is not well-documented so far mainly because of the limited spatial resolutions of photogrammetry based methods. Conversely, the structured light method with defocused binary stripe illumination can perform superfast (e.g. several kHz) high-resolution 3D imaging, and thus has the potential for dense mechanics analysis. In this talk, I will present our preliminary testing with a robotic bird. Specifically, I will talk about: (1) our superfast 3D imaging method for the robotic bird; (2) our point tracking method with geodesic computation; and (3) our strain computational method based on Kirchhoff-Love shell theory.
Linkoping University, Sweden
Dr. Valyukh received his PhD degree from Taras Shevchenko National University of Kyiv, Ukraine, in 2003. After that he conducted research at Dalarna University and Swedish LCD Center (Borlange, Sweden). Several times from 2005 up to 2014, he was a visiting researcher at the Hong Kong University of Science and Technology. Since 2010 Dr. Valyukh has been an assistant professor at Linkoping University (Sweden), and since 2012 he is a docent (associated professor) at this University. Dr. Valyukh is an author of 11 patents, 1 book and over 80 scientific works. The area of his interests is optical simulations (interaction of light with complex structured media, design and optimization of optical devices) and measurements (spectroscopic ellipsometry and polarimetry).
Speech title: Advanced Tunable Diffractive Optical Elements
Abstract: Diffractive optical elements based on liquid crystals will be reported. We investigated formation of a desired liquid crystal director distribution by the use of inhomogeneous alignment. Such an approach enables one to control the optical element by a uniform electric field when only two continues electrodes are needed. Physical limitations and potential abilities of liquid crystal diffractive optical elements will be discussed. As examples of practical applications, a reflective lens utilizing cholesteric liquid crystal and a projection optical system for an augmented reality display built into a contact lens or glasses will be demonstrated.
Jinan University, China
Professor Jingang Zhong is currently with the Department of Optoelectronic Engineering and the Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Educational Institutes, Jinan University, Guangzhou, China. He mainly investigates in the fields of single-pixel imaging, three-dimensional profilometry, digital holography, optical microscopy, surface plasmon resonance biosensors, etc.
Speech title: Fourier Single-pixel Imaging: Recent Progress
Abstract: Fourier single-pixel imaging (FSI) is a recently proposed computational imaging technique which allows for producing high-quality images by using a detector without spatial resolution. FSI is a breakthrough for the field, as it well tackles the problems of low quality and low efficiency of single-pixel imaging. More recently, FSI has been extended to three-dimensional imaging, multi-modality imaging, dynamic imaging, and encrypted imaging. What’s more, FSI has been demonstrated that it outperforms Hadamard single-pixel imaging in terms of efficiency. The recent progress of FSI adds the value of practical application of FSI. And FSI may find important applications where the pixelated detectors are unavailable.
The Institute of Electronic Structure and Laser of the Foundation for Research and Technology-Hellas, Greece
Principal project coordinator and laboratory head at IESL. Employed as research scientist at FORTH/IESL laser applications division since May 1996. Since then she has established and leads the Display Holography and Holographic Metrology laboratory. Obtained a BSc in Optical Physics - TEIA Univ. Athens Gr, Post-Graduate Diploma in Optical Holography - RCA Univ London UK, MSc in Material Science EMP Athens Polytechnic, MPhil in Art Conservation RCA-ICSTM-V&A London UK, and PhD in Applied Science - Univ. Sunderland. Research activities range from the development of optical holographic techniques for display holography and for ND material testing and artwork structural defect analysis, detection and identification of structural defects on artworks, antifraud technologies, physicomechanical deterioration mechanisms, environmental effects and transportation impact, photomechanical effects of laser ablation, optical instrumentation, optical prototype system design and experimental verification, optical prototype system development, structural assessment, on-field campaigns methodology planning, innovation and research development, philosophy of science and physical philosophy.
Speech title: Develoment Of Portable Interferometry System For Displacement Measurement In Cultural Heritage Applications
Abstract: Cultural Heritage is concerned with objects and materials that witness the historical evolution and human civilisation and are due to be inheritent to next generations. As such prevention of damage and failure is an ultimate neverending aim in art conservation science. Interferometry techniques offer the spatial sensitivity to assess minor changes prior to damage while important ethic principles of non destructivity and non invasivity are satisfied as basic requirements for artobject examnation. Scientific laboratories explore the trends in modern instrumentation to adjust it to the needs of Cultural heritage fields. In this context the development of a portable interferometry system based on the fundamentals of holographic and speckle interferometry satisfying the limitations and overpassing the state of the art in on-field measurements for structural diagnosis is presented with examples from represantative application fields.
Shanghai Synchrotron Radiation Facility, China
Education Experiences: 1991.9-1995-7, Bachelor degree of science at the Northwest Polytechnic University and my major was metal material and heat treatment. 2001.9-2005.7 PhD degree of science at Shanghai institute of optics and fine mechanics, Chinese Academy of Science. Now is in charge of optical metrology in SSRF(Shanghai Synchrotron Radiation Facility); Shanghai institute of applied physics, Chinese Academy of Science.
Speech title: Long Trace Profiler at SSRF
Abstract: LTP-1200 is the first long trace profiler (LTP) developed by Shanghai Synchrotron Radiation Facility (SSRF). Upgrade of the LTP-1200 started from 2015 to improve the slope error range of measurement and system accuracy. A new optical system has been designed, and the entire optical elements, such as pi-phase plate, laser and detector have also been replaced. In particular, slope error of ±4mrad measurement range, slope resolution of 2nrad and the lateral resolution of 0.2mm are obtained after the upgrade process.
Sichuan University, China
Dr. Lei Li is an associate professor at the department of School of Electronics and Information Engineering, Sichuan University. He received his Ph.D. and B.S. from Sichuan University in 2013 and 2008. He was a research assistant at Institute of Optics and Electronics, Chinese Academy of Sciences, from 2013 to 2014. In 2015, he was exceptionally promoted to associate professor in Sichuan University. His research interest focuses on liquid optical device, optical system design, and 3D display. He is the author or coauthor of more than 30 papers in peer-reviewed journals and conferences and one book chapter in his research career. He is the member for several professional organizations, also reviewer for many prestigious peer-review journals in optical sciences related fields.
Speech title: Optofluidic Devices for Imaging System
Abstract: Optofluidic devices such as liquid lenses, liquid irises are important elements of next generations of imaging system. In this talk, we report several adaptive imaging systems based on optofluidic devices. The proposed system can realize continuous zoom change and correct aberrations during the tuning range. voltages and pneumatic actuation are used to control the system. And, the proposed system is very compact without any mechanical movement part.
National University of Defense Technology, China
Dr. Lin Zhou is an associate professor at the National University of Defense Technology (NUDT) in China. He received his Ph.D. and B.S. from NUDT in 2008 and 2003. He had worked with Optics & Metrology Group in Brookhaven National Laboratory (BNL) as a visiting scientist for one year. His research field is optical fabrication and test. He is in charge of ion beam figuring group in NUDT. He won the 2nd prize of National Award for Technological Invention once, and was supported by the Program for New Century Excellent Talents in University.
Speech title: Slope-based Figuring Method to Fabricate Grazing-Incidence Reflective Optics
Abstract: The raw measurement output data of grazing-incidence reflective optics are commonly slope profiles, not height profiles. However, the traditional figuring processes are based on surface height profiles, not on surface slope profiles. Therefore, the raw slope profiles should be converted to height profiles in figuring processes, and this conversion will result in cumulative errors. As for this problem, we propose a slope-based figuring (SF) method which uses the raw slope data instead of the converted height data to fabricate grazing-incidence reflective optics. Both 1D SF model and 2D SF model are established in this study. The slope removal functions and algorithms used to calculate dwell times are discussed as well. Finally, some figuring results are presented.
University of Wollongong, Australia
Jiangtao Xi received BE from Beijing Institute of Technology, China in 1982, ME from TsingHua University, China in 1985 and Ph.D from the University of Wollongong, Australia in 1996, all in electrical engineering. He was a Postdoctoral Fellow at the Communications Research Laboratory, McMaster University, Ontario, Canada from 1995 to 1996, a Member of Technical Staff at Bell Laboratories, Lucent Technologies Inc., NJ, USA from 1996 to 1998. He worked as the Chief Technical Officer at TCL IT Group Co, China from 2000 to 2002. In 2003 he rejoined the University of Wollongong as a Senior Lecturer and he is currently a full Professor and the Head of School of Electrical, Computer and Telecommunications Engineering. His research interests include signal processing and its applications in various such areas as instrumentation and measurement, as well as communications.
Speech title: Fringe Pattern Analysis using Message Passing Based Expectation Maximization for Fringe Projection Profilometry
Abstract: Fringe projection profilometry (FPP) is a popular optical 3-D imaging approach, in which the images of deformed fringe patterns are analyzed to extract object surfaces (i.e., height maps of object surfaces). As an object surface normally exhibits smooth areas, height correlations of an object surface can be used to denoise and improve the measurement performance of the FPP. In this talk, we use autoregressive (AR) models with unknown parameters to describe the unknown height correlations and formulate the FPP analysis problem under the framework of expectation maximization (EM). With EM, the unknown AR model parameters are determined based on observations, and the estimates of the heights with their correlations exploited can also be extracted. To deal with the large-scale problem, a message passing based implementation of the formulated EM problem is studied and the relevant message updating rules are developed. The presented approach has a linear complexity and it allows parallel processing due to the nature of message passing. Simulation and experimental results demonstrate a significant performance improvement by the proposed approach.
Southeast University, China
Dr. Wang Chenxing received her Ph.D. degree from Southeast University in 2013, and was a research fellow at Nanyang Technological University in Singapore from 2014 to 2016. She is now an associate professor in Southeast University. Her research interests include optical measurement, advanced signal processing, precision engineering and automation.
Speech title: SEMD Profilometry
Abstract: Surface profiling in dynamic states is widely needed, which can be implemented using single-frame projection (SP) of structural illumination. The classic Fourier Transform Profilometry is disturbed by the possible complex background, which limits the ability for complicated surface or the measurement in harsh environment. Empirical mode decomposition (EMD) combined with Hilbert Transform (HT) has strong capability to process complex nonlinear signals, which has been successfully developed and applied to process fringe patterns. The recently developed Sinusoidal-assisted EMD (SEMD) profilometry will be introduced in this talk, including the solutions to the challenging issues of SP system. The newly proposed SEMD methods in different spatial dimensions will be described and investigated in various applications of optical fields.
Beihang University, China
Dr. Bing Pan is a full professor in School of Aerospace Science & Engineering at Beihang University (BUAA), China. He received his Ph.D degree in Mechanical Engineering from Tsinghua University in 2008. After working with Professor Anand Asundi in Nanyang Technological University (Singapore) as a postdoctor, he joined Institute of Solid Mechanics, BUAA in 2009. His current research interests mainly focus on advanced optical techniques and their applications in experimental mechanics, especially the digital image correlation, digital volume correlation techniques for surface or internal deformation measurement of solid materials and structures, as well as new experimental techniques for characterizing thermo-mechanical behavior of hypersonic materials and structures. He has published 93 peer-reviewed articles in international journals, and six of these papers were selected as ESI highly cited papers. All his publications have been cited more than 3500 times according to Web of Science with a h-index of 27. Dr. Pan was selected for Youth Changjiang Scholars (MOE) in 2016, and won the National Natural Science Funds for Excellent Young Scholar in 2013.
Speech title: Recent Progresses in Digital Volume Correlation
Abstract: In this talk, we report the following important progresses recently made in the basic theory and practical implementation of digital volume correlation (DVC) for full-field internal deformation measurement. First, we present an accurate and efficient 3D inverse compositional Gauss-Newton (IC-GN) algorithm for subvoxel registration, which outperforms existing algorithms in terms of computational efficiency and noise robustness. Second, we propose a flexible and accurate DVC method scale to high-resolution volume images with up to billions of voxels. This advanced DVC technique combines a novel layer-wise reliability-guided displacement tracking strategy with the 3D IC-GN algorithm, and addresses the challenge of processing high-resolution volumetric images in personal computers with limited random-access memory. Third, we establish a self-adaptive DVC method for full-automatic and accurate internal deformation, which can determine optimal subvolume sizes and shape functions at each measurement point according to image noise level, image gradients and local deformation feature. Final, we investigate the displacement and strain errors in DVC due to the self-heating effect of a commercially available X-ray scanner. To realize high-accuracy internal deformation measurement with DVC, we develop an effective and easily implemented reference sample compensation (RSC) method for in-situ systematic error correction.
University of Huddersfield, UK
Dr Feng Gao is a Reader in Metrology and Instrumentation at the School of Computing and Engineering, University of Huddersfield. His main research interests are in the field of surface metrology and advanced optics. He studied precision measurement and instrumentation as an undergraduate and postgraduate student in Tianjin University. After his postgraduate study he worked as an Assistant Engineer and Engineer in the National Institute of Metrology of China and as a visiting scholar at the PTB, Germany. Then he became a Ph.D. student in Coventry University. Following his Ph.D. study, he worked as a Research Associate in Loughborough University. Subsequently he joined the Centre of Precision Technologies of University of Huddersfield as a senior research fellow.
Speech title: Embedded Metrology for Surface Measurement and Inspection
Abstract: Surface quality becomes increasingly important due to the widely use of nanoscale and ultra-precision structured and freeform surfaces in many applications such as optics, MEMS, micro fluidics and the micro moulding industries. These industries all critically rely on ultra-precision surfaces. Embedded metrology providing metrology on the manufacturing platform, enabling measurement without the removal of the work piece. By integration of metrology sensor or system upon the manufacturing platform can lead to a better control of the quality of the surface of the product and increase throughput. In this paper, we present several optical sensors developed in our Center which can be used for embedded surface metrology. We focus on the discussions of optical interferometry at a shop floor environment, which is normally subjected to environmental disturbances and vibrations. We will discuss the methods to reduce the influence of these noises and present the applications through case studies
Harbin Institute of Technology, China
Jinsong Leng is Cheung Kong Chair Professor, NSFC Outstanding Young Investigator and Founding Director of the Center for Smart Materials and Structures (CSMS) at Harbin Institute of Technology (HIT), China. He was also recognized as Research Giant of University of Southern Queensland (Australia) and Honorary Professor of Kingston University London (UK), and elected as a World Fellow of ICCM, and Fellow of the SPIE, Fellow of Institute of Physics (IOP), Fellow of Royal Aeronautical Society (RAeS), Fellow of Institute of Materials, Minerals, and Mining (IMMM) and Associate Fellow of AIAA. The research areas of Prof. Leng cover sensors and actuators, shape memory and electroactive polymers and their composites, multifunctional nanocomposites, active vibration control, structural health monitoring, and active deployable or morphing structures.
Speech title: Smart Composite Structures and Their Structural Health Monitoring: Recent Progress and Future Perspective
Abstract: Smart composites and structures have excellent performances, including self-monitoring, self-assembly, and adaptability, and show great potential in various fields. This talk will present some progress in structural health monitoring that utilizing Fiber Bragg Grating (FBG) and Mechanoluminescent (ML) sensors to monitor the temperature and strain during curing and service process of composites, as well as the large deformation of smart composites structures. Moreover, novel actuation methods and potential applications in deployable structures and 4D printing of shape memory polymers and their composites will be introduced. Finally, some challenges and perspective of smart composites and structures will be summarized.
Tsinghua University, China
Dr. Xide Li is a professor in the Department of Engineering Mechanics at Tsinghua University. He received his B.Sc degree from the Department of Physics of Northwest University at Xi’an in 1986 and his M. Sc and Ph.D degrees in Engineering Mechanics in 1989 and in Mechanical Engineering in 1992, respectively, from Xi’an Jiaotong University. He was a guest researcher at Luleå University of Technology in Sweden in 1997 and Hong Kong University in 2000, and 2002 respectively. From 1993 to 1998, he was a postdoctoral research fellow and an associate professor at University of Science and Technology of China. He joined Tsinghua University as an associate professor in 1999 and then promoted to a full professor. He is a member of a council of Chinese Society of Theoretical and Applied Mechanics (CSTAM), the member of OSA (Optical Society of America) and American Nano Society, Vice-president of Experimental Mechanics Committee of CSTAM, and the Secretary-General of Beijing Society of Theoretical and Applied Mechanics (BSTAM). Professor Li’s current research fields are Micro/Nanomechanics, Experimental mechanics, and Mechanics of structures and materials in aerospace. He has edited several special issues in the international Journals, and authored and co-authored more than 160 scientific and technical papers.
Speech title: Scanning Imaging and Restoration of Moving and Deformed Surfaces
Abstract: Optical imaging is a parallel imaging, which can instantaneously make the image of an object at the image plane. People can record images from static to millions of frames per second with a proper medium. Recently, for example, New Scientist has reported that a super-fast camera was capable of capturing a laser beam on its flight at a speed of 20 billion frames per second. Therefore, for optical imaging, even transient or ultrafast events can be imaged and recorded by a suitable optical system and mediums. However, as it is known, the spatial resolution of optical imaging is limited by the diffraction effect of light waves, which is about 0.2 microns for visible light. Obviously, such spatial resolution is not acceptable for imaging and measuring materials, structures or devices at micro/nano scale. With the development of scanning microscopy technology such as SEM, TEM and AFM, high spatial resolution imaging technology enables one to distinguish a static object or its displacement at subatomic scale. However, for several decades, an important issue around scanning imaging is how to achieve accurate and precise image of a moving and deformed object. Although one can realize dynamic imaging of moving or deformed objects with high-speed frame scanning, the sequential imaging characteristic of scanning imaging mode leads to the imaging of every point in an image at different time, that is, non-parallel imaging. Obviously, first, scanning imaging mode can only form a blurry image for a moving or deformed object. Second, direct use of these scanning images measuring the displacement of the moving or deformed object will lead to delay and distortion of the displacement at time scale, which in turn causes inaccurate characterization of the object's displacement and deformation. Here, we establish a new scanning imaging and restoration theory of moving and deformed objects. The scanning equation of electron beam of an SEM, the kinetic and deformed equation of the tested object, and the hypothesis of imaging intensity invariant before and after movement or deformation of the object are combined, and a convolutional restoration equation of original image and scanned image is established. The restoration images scanning from harmonic vibration and nonlinear deformation of tested object are completed and a time series algorithm is proposed to extract its motion and deformation parameters. We anticipate that this imaging and restoration theory will make the scanning imaging to use in in-situ dynamic measurement.
Harbin Institute of Technology, China
Zhengjun Liu is a professor in Department of Automatic Test and Control, Harbin Institute of Technology (HIT), China. He received his BS degree in 2002 from HIT, Harbin, China. He received his PhD degree there in 2007 from the Department of Physics, HIT. He was honored by the Program for New Century Excellent Talents in University (2012). He published 96 peer reviewed journal articles in the field of optics, 2 books, and 1 book chapter. The publications have been cited by others for over 1300 times and H-index of 27. He is a senior member of OSA and a member of IEEE. His current research interests include optical image processing, super resolution imaging, and diffraction imaging.
Speech title: The Application of Multi-Image Phase Retrieval in Diffraction Imaging
Abstract: Coherent diffraction imaging is a useful tool for lens-free and less system, in the X-ray regime or visible spectrum. It is proved that lens imaging is a general kind of diffraction, which can be depicted by the general fractional Fourier transform mathematically. The multi-image phase retrieval is presented for obtaining more accurate reconstruction pattern of light field. Here more intensity patterns are applied for wavefront retrieval. The performance of these algorithm is demonstrated by numerical simulation and experiment. Noise reduction technique is also considered for the algorithms. The coherence of light source is also checked in these imaging system. The measurement error analysis of these axial methods, such as axial position error and wavelength bias, is displayed for obtaining the high quality of result image. The impact of sampling condition on phase retrieval is also analyzed here.
Purdue University, USA
Dr. Song Zhang is an associate professor of mechanical engineering at Purdue University. He received his Ph.D. degree in mechanical engineering from Stony Brook University in 2005; spent three years at Harvard as a postdoctoral research fellow; and then worked at Iowa State University before joining Purdue in Jan 2015. Dr. Zhang has published over 100 journal articles; authored one book; edited one book; co-authored 7 book chapters; and owns 3 U.S. patents. 13 of his journal articles were selected as cover page highlights. Besides being extensively utilized in academia, the technologies he developed have been used by rock band Radiohead to create a music video House of Cards; and by the Zaftig Films to produce a movie Focus (II). He has won AIAA Best Paper Award, IEEE ROBIO Best Conference Paper Award, Best of SIGGRAPH Disney Emerging Technologies Award, the NSF CAREER award, Stony Brook University’s “40 under 40 Alumni Award”, Discovery in Mechanical Engineering Award, and College of Engineering Early Career Faculty Research Excellence Awards from Iowa State University and Purdue University. Due to his contributions to high-speed, high-resolution 3D imaging and optical information processing, he was elected as the fellow of SPIE-International Society for Optics and Photonics, and the senior status of Optical Society of America (OSA).
Speech title: High-Speed 3D Shape Measurement Techniques and Applications
Abstract: Advances in optical imaging and machine/computer vision have provided integrated smart sensing systems for the manufacturing industry; and advanced 3D imaging could have profound impact on numerous fields, with broader applications including manufacturing, biomedical engineering, homeland security, and entertainment. Our research addresses the challenges in high-speed, high-resolution 3D imaging. The digital binary defocusing methods coincide with the inherent operation mechanism of the digital-light-processing (DLP) technology, permitting tens of kHz 3D imaging speed at camera pixel spatial resolution. In this paper, I will discuss the superfast 3D optical sensing using binary focusing method and cover some of the applications that we have been exploring including cardiac mechanics, forensic science.
Wuhan University, China
Dr. Yajun Wang received his PhD degree from Iowa State University in 2013.12. After that he conducted research about high-accuracy optical surface measurement in the Institution of Machinery Manufacturing Technology, CAEP. Since 2017 he has been an associate professor in the State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University. Dr. Yajun Wang has published over 20 journal papers and co-authored two book chapters. He has received the Excellence Research Award from Iowa State University, and the major areas of his interests include 3D optical sensing, machine vision and related applications.
Speech title: Multi-Level Pattern Design And Optimization for High-Accuracy 3D Shape Measurement
Abstract: For 3D shape measurement, the speed and accuracy are the two most concerned features for lots of applications. Recently developed binary defocusing technique has demonstrated its capability for high-speed 3D measurement using 1-bit fringe patterns. Meanwhile, numerous research has also been conducted to improve its accuracy by modulating the binary patterns in spatial domain. However, these techniques still have limitations for the current achieved accuracy. Considering the scenarios that extremely high accuracy is required, a possible solution is to adopt multi-level patterns with modulation in both time and spatial domain. In this presentation, I will introduce our recent work about multi-level pattern design and optimization, including multi-level triangular pulse width modulation (TPWM) method, multi-level optimal pulse width modulation (OPWM) method and single-pattern realization strategy.
Jiangsu University, China
Dr. Houxiao Wang received his PhD degree from Nanyang Technological University (NTU) in 2013. He conducted the collaboration work attached with the Institute of High Performance Computing (IHPC) in Singapore from 2009 to 2011. He is currently an associate professor at the School of Mechanical Engineering, Jiangsu University. His current research interests mainly focus on the ultrasonic vibration-assisted laser processing/manufacturing, the advanced integrated magnetic-ultrasonic assisted laser processing/manufacturing, and the focused ion beam (FIB) nanofabrication and nanometrology for optical applications. Dr. Wang is currently the member of several professional organizations such as The Optical Society (OSA), the Optics and Photonics Society of Singapore (OPSS), and the Materials Research Society of Singapore (MRSS). He served as a session chair for Advanced Lasers and Applications of the 12th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR 2017), the 22nd OptoElectronics and Communications Conference (OECC 2017), and the 5th Photonics Global Conference 2017 (PGC 2017), Singapore. He got the NTU Research Scholarship (Singapore) in 2008, and he is currently a core member of Innovation/Enterpreneurship Team supported by the Innovation & Enterpreneurship Project of Jiangsu Province.
Speech title: Magnetic-Ultrasonic Assisted Laser Drilling and Trepanning
Abstract: Electro-discharge machining (EDM) and pulsed laser drilling/trepanning are commonly used for fabricating cooling holes in nickel super-alloy aero-engine components. Although the EDM technique produces high quality holes, it is very slow, without mentioning the high tooling cost. The millisecond pulsed laser drilling/trepanning is much faster. However, the laser (especially a laser with millisecond pulses) alone usually cannot drill/trepan high quality microholes, mainly resulting from the normally encountered recast layer formation with metallurgical/morphological defects. In this talk, a magnetic-ultrasonic assisted laser drilling/trepanning technique is accordingly reported for machining microholes in GH4037 nickel super-alloy. The mechanism of this advanced technique will be introduced. Moreover, the effects of the ultrasonic-magnetic-laser parameters on the millisecond pulsed Nd:YAG laser drilling/trepanning performance and quality will be also reported through comparing with holes drilled/trepanned without ultrasonic-magnetic assistance.
University of Nottingham, UK
Richard is currently a professor in metrology at the University of Nottingham and prior to this spent 25 years at the National Physical Laboratory. Richard's research is dominated by what he calls "information-rich metrology": the enhancement of manufacturing metrology through the use of a priori information, often utilising concepts from artificial intelligence. His current interests are the dimensional measurement of precision and additive manufactured structures. Richard is on the Council of the European Society of Precision Engineering and Nanotechnology, the International Committee on Measurements and Instrumentation and several international standards committees. He is the European Editor-in-Chief for Precision Engineering. He has over 350 publications including five textbooks. He is a Fellow of the Institute of Physics, the Institution of Engineering & Technology, the International Society of Nanomanufacturing and a Sustaining Member of the American Society of Precision Engineering. He is a visiting professor at Loughborough University and the Harbin Institute of Technology.
Speech title: Enhancing Freeform Shape Measurement Using Artificial Intelligence
Abstract: There is increasing demand for quality assurance of highly-complex objects, for example, those produced using additive manufacturing. A priori information about the nominal geometry of the measured object and the operating principles of measurement techniques can used along with multi-sensor data fusion to improve system performance in terms of object coverage. More specifically, we present a surface form measurement system which uses artificial intelligence and machine vision to enable the efficient combination of fringe projection, photogrammetry and deflectometry, can identify the regions of an object that are optimally measured by each individual process, and employs a measurement strategy in which the measurement systems are combined in concert to achieve a complete three-dimensional measurement of the object. Three-dimensional data is acquired on multiple scales at high speeds whilst the system minimises the size of the dataset required to perform the measurement. The system has a target maximum permissible error of 50 μm and the prototype demonstrates the ability to measure complex geometries of additively manufactured objects, with a maximum size of (10 × 10 × 10) cm, with minimal user input.
Beijing University of Posts and Telecommunications, China
Xinzhu Sang is a professor of the State Key Laboratory of Information Photonics and Optical Communications at Beijing University of Posts and Telecommunications. His current research interests include three-dimensional display, holography and novel photonic devices. He has published more than 160 pre-reviewed research papers in scientific journals, and holds 25 patents. He received dual bachelor's degrees in instrument science and management engineering from Tianjin University in 1999, and the Ph.D. degree at Beijing University of Posts and Telecommunications in 2005.From December 2003 to March 2005, he was with Optoelectronics Research Centre, Department of Electronic Engineering, City University of Hong Kong as a research assistant. From July 2007 to July 2008, he worked in University of California at Irvine as a postdoctoral research scholar. He has been a full professor in Beijing University of Posts and Telecommunications since September 2012. He is the deputy director and the secretary-general of the committee of Holography and Optical information, Chinese Optical Society Processing, a vice director of VR/AR division of Chinese Institute of Electronics. In 2011, he was selected for the Program for New Century Excellent Talents in University, Beijing Nova Program of Science and Technology. He was awarded as "Beijing Outstanding Teacher" prize in 2017.
Speech title: Interactive 3D Light-Field Displays with Real Captured 3D Data
Abstract: From Human visual characteristics, required performances and parameters of the 3D light-field display are discussed. A review of three-dimensional (3D) light filed displays is presented, and large size 3D light-field displays in BUPT are specially discussed. With the holographic functional screen and the compound lens array, an interactive floating full-parallax 3D light-field display is demonstrated based on a 27 inch 5120×2880 liquid-crystal panel. To suppress the aberration and increase the viewing angle, a compound-lens-array with two pieces of lens in each lens unit is designed and fabricated. The optimally designed holographic functional screen is used to re-modulate the light distribution from the lens-array, and only the clear 3D light field image is perceived without seeing the lens array. The floating full-parallax 3D light-field image with clear displayed depth of 30 cm can be perceived with the right geometric occlusion and smooth parallax in the viewing angle of 45°, where 96 ×96 views are used to generate the coded light-field image. The real-time interactive full-parallax 3D light-field display with the frame rate of 30 fps is realized. The functions of the holographic functional screen and the complex lens array are resolved and integrated in a thin optical devices, the full-parallax 3D light field display with the view angel above 80°and acceptable resolution is demonstrated. Based on the backward ray tracing coding, the real-time rendering for the light field display is realized. Touchable floating 3D image light-field displays in the air all also demonstrated. Interactive scientific 3D displays with the data of little creatures acquired by the full-color structured illumination optical sectioning microscopy are provided.
Tsinghua University, China
Liangcai Cao received his BS/MS and PhD degree from Harbin Institute of Technology and Tsinghua University, in 1999/2001 and 2005, respectively. Then he became an assistant professor at Department of Precision Instruments, Tsinghua University. He is now a tenured associate professor and serving as the director of Institute of Opto-Electronic Engineering at Tsinghua University. He was a visiting scholar at UC Santa Cruz and MIT in 2009 and 2014, respectively. His current research interests are information storage, processing and display based on holography. He is a senior member of OSA and SPIE.
Speech title: A Fast Algorithm for Compressive Digital Holography
Abstract: In-line lensless holography could maintain high space-bandwidth product (SBP) without an imaging lens, compared with off-axis holography. Compressive holography (CH) which combines compressive sensing and in-line lensless holography is considered as a promising solution for high SBP three-dimensional imaging. We developed a high SBP three-dimensional imaging algorithm based on the total-variation sparsity constraint. An efficient block-wise CH algorithm is used to reduce the digital holographic reconstruction time. The block-wise algorithm could locate accurate reconstruction searching spaces, resulting in high convergence speed and improved image contrast.
Nanyang Technological University, Singapore
Elke Reinhuber has been an assistant professor at Nanyang University in Singapore since July 2014. In 2013, she was awarded a practice-based doctorate degree in media arts from COFA, Sydney, Australia. In her dissertation, she proposed the term ‘counterfactualism’ as a new category for the arts and humanities to deal with the retrospective analysis of turning points in life. Elke received her initial professional training as an industrial photographer. She studied in Berlin, at the Berlin University of the Arts (UDK), as well as in London (Chelsea College), Bologna (Accademia di Belle Arti) and Sydney (SCA) before lecturing at the Braunschweig University of the Arts (HBK) and establishing the department for Media Design at the German University in Cairo (GUC). Her artwork has been presented in a number of international institutions.
Speech title: A Potential Future for Artistic Imaging beyond Visibility
Abstract: In recent years, a rising interest in scientific imaging has become apparent, in art production and in thematic exhibitions, as well as in popular media and advertising. Images captured by, and supposedly read through, machines open up a new era – not only for an as-yet-undefined aesthetic journey, but also to reveal insight into a normally invisible layer of reality. A wide range of techniques is already well established – not only in science, but also in an artistic context. Based on an overview of different media and their applications, the term phasmagraphy is introduced to be applied to the expanded boundaries of the visible photographic spectrum to the adjacent wavelengths.
Xi’an Jiaotong University, China
Dr. Jinyou Shao is Youg Changjiang Scholar Professor of Mechanical Engineering at State Key Laboratory for Manufacturing Systems Engineering of Xi’an Jiaotong University. He is interested in micro/nanomanufacturing techniques, stretchable and flexible electronics, and 3D fabrication of complex materials and structures. Dr Shao is/was the Principal Investigator in several projects funded by National Natural Science Foundation of China and Ministry of Science and Technology of China. He has published more than 100 peer-reviewed papers in prestige international journals, including 10 front and back covers in multi-disciplinary journals Advanced Materials, Advanced Functional Materials and Small. Moreover, he holds more than 30 patents including two United States patents. His recent research awards include the First Prize Technology Invention Award from the Ministry of Education of China (2015), New Century Excellent Talent from Ministry of Education of China, Outstanding Young Scholar from National Natural Science Foundation of China and Shaanxi Young Talents from Department of Science and Technology in Shaanxi Province.
Speech title: Electrical Capillary Force Driven Imprint Lithography and Its Applications in Optical Component Fabrication
Abstract: A variety of micro-/nano molding methods such as nanoimprinting, replica molding and transfer molding have been technically supporting the industrial developments of optical electronics, biological medicine, sensors and so forth. The completely and efficiently filling of the functional liquid materials into the mold cavities are the key for those molding technologies, which significantly depend on the wettability of the mold surface especially at microscale. The control and optimization of the wettability will greatly improve the fidelity and efficiency of the filling process and even allow for conveniently fabricating the commonly assumed difficult-to-mold structures. So, we have introduced the electrowetting effect into micro/-nano molding methods. In order to maximize the electrowetting range, we have demonstrated a method for decreasing the saturated contact angle by using a timely-modulated square wave voltage instead of the commonly used DC or sine wave voltages. Taking the advantages of this improved electrowetting effect, we have proposed different micro/-nano molding methods for meeting the increasing demands in various functional structures, including(1) a low-cost method for mass-producing aspherical microlens arrays with controllable curvatures and ultrahigh smooth surfaces, (2) a step-controllable electric-field-assisted nanoimprinting method with high efficiently and fidelity for fabricating photonics crystal on large area uneven substrate, (3) a electrowetting-assisted blading method for generating flexible transparent conductive film.
Northwestern Polytechnical University, China
Jianglei Di is currently an associate professor at Northwestern Polytechnical University(NPU). He received his BS and MS degrees in applied physics and Optics from NPU in 2004 and 2007, respectively, and his PhD degree in optical engineering from NPU in 2012. He is an author of more than 80 journal and conference papers. His current research interests include digital holography and optical interferometry technique. He is a member of SPIE and OSA.
Speech title: Common-Path Digital Holographic Microscopy and Its Applications
Abstract: Digital holographic microscopy (DHM) has become a novel tool with advantages of full field, non-destructive, high-resolution and 3D imaging. Compared with the typical Mach–Zehnder or Michelson interferometer configurations, the common-path DHM is more simple, compact and stable, and it has very promising and potential applications in the field of biological and medical science. In this paper, we summarize the principles and applications of common-path DHM, introduce dual-wavelength technique into DHM, analyze the traditional optical configurations and basic realization method, and apply it to the quantitative measurement of MEMS device, living cells, and so on.
Shanghai University, China
Huadong Zheng received his PhD at Shanghai University in 2009. He is currently an associate professor at Shanghai University. His current research interests are in holographic display, computational optics, and diffraction optics.
Speech title: Full-Color Holographic Display Using Computer-Generated Phase-Only Holograms and Liquid Crystal Spatial Light Modulators
Abstract: In this presentation, some algorithms for calculating phase-only holograms for full-color holographic display will be introduced, and Holographic display system using phase-only spatial light modulators (SLMs) will also be introduced. In addition, the modulation curve of phase-only SLM and its effects on the full-color imaging will be introduced, and the corresponding countermeasures will be introduced. Chromatic aberration in full-color holographic display and the corresponding countermeasures will also be introduced. Methods for increasing viewing angle of reconstructed image will be introduced finally.
Nanjing University of Science and Technology, China
Dr. Chao Zuo is a professor at the department of Electronic and Optical Engineering, Nanjing University of Science and Technology (NUST). He received his Ph.D. and B.S. from Nanjing University of Science and Technology in 2014 and 2009. He was a research assistant at Centre for Optical and Laser Engineering (COLE), Nanyang Technological University (NTU), Singapore, from 2012 to 2013. In 2014 and 2016, he was exceptionally promoted to associate professor and professor of NUST, respectively. Now he is the principal investigator of the Smart Computational Imaging Laboratory at NUST where the research interest focuses on computational bio-imaging, phase retrieval, optical information processing, and high-speed 3D optical sensing. He has published over 60 peer-reviewed journals and one book chapter in his research career with total citation over 1400 times according to Google Scholar. He is the member for several professional organizations, also reviewer for many prestigious peer-review journals (>30) in optical sciences related fields.
Speech title: Computational Light Microscopy
Abstract: Computational light microscopy is an emerging technology which extends the capabilities of optical microscopy with the combination of optical coding and computational decoding. It provides us with novel imaging functionalities or improved imaging performance which are difficult or impossible to achieve by using conventional microscopic systems. Recent advances in LED lighting and digital display technology provide new opportunities for active digital illumination and imaging control for advancing microscopy. In this presentation, we report our most recent developments of computational light microscopy with programmable illumination and coded aperture. Based on Transport-of-Intensity Equation (TIE) computational phase retrieval, we demonstrate for the first time that noninterferometic high-resolution quantitative phase microscopy with transverse resolution up to 208 nm (corresponding to an effective numerical aperture of 2.66) at temporal scales ranging from 1-second to several days, without resorting to interferometric measurement and explicit synthetic aperture manipulation. Besides, we also report wide-field high-resolution imaging at 300 nm transverse resolution (corresponding to an effective numerical aperture of 1.6) with only use of a 10x objective, achieving a space-bandwidth-product of 98.5 megapixels (more than 50 times higher than that of the conventional microscope with the same resolution) based on Fourier ptychography computational phase retrieval.
Qingdao University of Technology, China
2016.01-, Qingdao University of Technology, Distinguished Professor of Taishan Scholar
2004.07-2015.12, Wenzhou University, Distinguished Professor
2013.01-2013.03, Osaka University, Visiting Scholar
2011.09-2012.08, National University of Singapore, Visiting scholar
1996.12-2001.08, Alignment tool(s) PTE LTD, Singapore, Engineer
1993.07-1996.11，Jier Machine-Tool Group Co. LTD, Assistant Engineer
Research Interests: Laser precision micro/nano processing
Projects Researched/researching: More than 20 projects are Researched/researching Awards, The first prize of Zhejiang Province
Papers: More than 40 papers are published
Patents: More than 30 patents are licensed
Speech title: Research and Application of Laser Micro Processing
Abstract: Laser micro processing is widely researched and used to process MEMS parts and micro structures. Femtosecond laser two-photon polymerization is a good method for 3D-printing micro parts. Femtosecond laser processing micro holes on different parts is also researched and used in many domain. Our team do much research and application on fabricating MEMS parts with femtosecond laser two-photon polymerization and drill micro holes on several kinds of parts.
Sichuan University, China
Qiong-Hua Wang is a professor of optics at the School of Electronics and Information Engineering, Sichuan University, China. She was a research scientist at the School of Optics/CREOL, University of Central Florida from 2001 to 2004. She received her M. S. and Ph. D. degrees from the University of Electronic Science and Technology of China (UESTC) in 1995 and 2001, respectively. She worked at UESTC from 1995 to 2001 and at Philips Mobile Display Systems in Shanghai in the summer of 2004. She has published approximately 200 SCI papers. She has authored 2 books. She holds 5 U. S. patents and 89 Chinese patents. She is a senior member of the Society for Information Display (SID) and associate editors of Optics Express and Journal of the Society for Information Display. Her research interests include optics and optoelectronics, especially display technologies.
Speech title: Integral Imaging 3D Displays Based on Micro-Lens Array Holographic Optical Element
Abstract: This talk will introduce several integral imaging 3D displays based on micro-lens array holographic optical element including an integral imaging augmented reality 3D display, a double-side integral imaging 3D display and a dual-view-zone table-top 3D display.
Shanghai University, China
Dr. Wen-Jing Zhou is a associate professor at the department of Precision Mechanical Engineering, Shanghai University. She received her Ph.D. from Shanghai University in 2007. She also is a visiting professor in the optical scanning-holographic imaging group (OSIG), Bradley Department of Electrical and Computer Engineering at Virginia Tech, USA. Her current research interests include digital holography, digital holographic tomography, Transport of Intensity-Equation and other precision optical measurement. She is an author of over 40 peer-reviewed journals publications, also has been invited as a reviewer for the prestigious journals in optical fields and biomedical fields.
Speech title: Phase retrieval based on Transport of Intensity-Equation by using Single Digital Hologram
Abstract: We presented a method to obtain intensity information for TIE calculations through the use of single digital hologram, and utilize a finite difference approach for solving the TIE. In the proposed method, there are no moving parts involved since a digital hologram is used to generate intensity distributions at different defocus distances. Both simulations and experimental results have verified the effectiveness and validity of our proposed method. For the simulations, we have analyzed the different effect by using a in-line hologram or a off-axis hologram for phase retrieval based on TIE. For the experimental part, we have used a phase object along with an off-axis holographic recording system. the proposed technique is accurate as demonstrated in simulations.
Hebei University of Technology, China
Dr. Zonghua Zhang is a full professor in Hebei University of Technology of China. He obtained his Ph.D degree from Tianjin University of China in 2000. From Jan. 2001 to Sep. 2002, he was a postdoctoral researcher in Mechanical Engineering, Tianjin University. From 2003 to 2009, he was in Ruhr University Bochum of Germany, Queen’s University of Canada, Heriot-Watt University and University of Leeds of UK. His research interests are 3D imaging, optical metrology, and fringe pattern analysis. He is a Marie Sklodowska-Curie Individual Fellowship, and New Century Excellent Talents in University Supported by Ministry of Education of China.
Speech title: Full-Field 3D Shape Measurement of Specular Objects by Direct Phase Measuring Deflectometry
Abstract: There are a large number of specular objects in aerospace, car industry, medicine, and so on. It is important to measure 3D shapes in order to gurantee their function and quality. Phase measuring deflectometry (PMD) has been widely studied to test specular free-form surfaces because of its advantages of non-contact operation, full-field measurement, large dynamic range, fast acquisition, high precision and automatic data processing. Due to slope integration procedure, complicated specular components having isolated and/or discontinuous surfaces cannot be measured by the existing PMD methods. This talk presents a novel Direct PMD (DPMD) technique to solve this kind of problem. A mathematical model is established to directly relate the absolute phase and depth, instead of the phase and gradient data. Based on the model, a hardware measuring system has been set up, which consists of two screens, a plane splitter, and a CCD camera. The system parameters are calibrated by using a plane mirror based on machine vision-based methods. 3D shape of an artificial specular step and a monolithic multi-mirror array having multiple specular surfaces has been measured. The experimental results verified that the proposed system based on DPMD can obtain full-field 3D shape of specular objects having isolated and/or discontinuous surfaces accurately and effectively.
Beijing Institute of Technology, China
Juan Liu has received her MS in optics from Shanghai University, Shanghai, China, in 1998, and her PhD degree in diffractive optics from the Institute of Physics, Chinese Academy of Sciences, Beijing, China, in 2001. She was a visiting scientist at Institute of Medical Physics in University of Vienna, Austria, from 2001 to 2003; at University of Arizona from August to October 2014; at University of California at Berkeley from October 2014 to August 2015. From 2005 to 2008, she was an associate professor in Beijing Jiaotong University, Beijing, China. From 2008 until present, she is a professor in Key Laboratory of Photo Electronic Imaging Technology and System, Ministry of Education of China, School of Optics and Electronics, Beijing Institute of Technology, Beijing, China. Her major research interests include: Diffractive Optical Elements, 3D holographic display, the design and the fabrication of micro-optical elements, surface plasmon polaritons, and rigorous analysis of microlens by various methods.
Speech title: Overview of Near-Eye Holographic 3D Display in BIT
Abstract: An overview of 3D near-eye display based on holographic elements is presented. The numerical simulations and the optical experiments demonstrate that the holographic waveguide near-eye display can solve the visual fatigue problemThese methods bring possible promotions for the Augmented Reality (AR) technique.
Beijing Institute of Technology, China
Dr. Bin Hu received his Ph.D degree in Institute of Microelectronics, Chinese Academy of Sciences in 2010. Then he became a research fellow of Nanyang Technological University, Singapore. In 2013, he joined the School of Optics and Photoncis, Beijing Institute of Technology, China. His research interests include Plasmonics, Metamaterials and Metasurfaces, Diffractive Optics, and Boundary Elecment Method.
Speech title: Dynamical Tuning of Terahertz Meta-Lens Assisted by Graphene
Abstract: Metasurface has become a new photonic structure for providing potential applications to develop integrated devices with small thickness, because it can introduce an abrupt phase change by arrays of scatters. However, the function of the metasurface based devices lacks active control once the structure is fabricated. Here a tunable terahertz meta-lens whose focal length is able to be electrically tuned by ~4 λ is demonstrated experimentally. The lens consists of a metallic metasurface and a monolayer graphene. Due to the dependence of the abrupt phase change of the metasurface on the graphene chemical potential, which can be modulated using an applied gate voltage, the focal length is changed from 10.46 mm to 12.24 mm when the gate voltage increases from 0 V to 2.0 V. This type of electrically controlled meta-lens could widen the application of terahertz technology.
Korea Advanced Institute of Science and Technology, Republic of Korea
YongKeun Park is Associate Professor of Physics at KAIST. He earned a Ph.D. from Harvard-MIT Health Science and Technology. Dr. Park’s area of research is digital holography and its applications for biology and medicine. He has published +100 peer-reviewed papers including 2 Nat Photon, 2 Nat Comm, 4 PRL, 4 PNAS papers. Also, he is a fellow in OSA, and an editor of Optics Express, Scientific Reports, Experimental Biology and Medicine, and Journal of Current Optics and Photonics. Two start-up companies with +30 employees have been created from his research (Tomocube, The.Wave.Talk).
Speech title: Holotomography for Non-Invasive Label-Free 3d Imaging of Live Cells and Tissues
Abstract: Holotomography (HT) uses a laser interferometry to measure 3-D refractive index (RI) distribution. HT servses as a powerful tool for imaging small transparent objects, such as biological cells and tissues. HT is an optical analogous to X-ray computed tomography (CT); HT measured multiple 2-D holograms of a sample with various illumination angles, from which a 3-D RI distribution of the sample is reconstructed by inversely solving the wave equation. Unlike conventional fluorescence-based imaging techniques, HT provides label-free 3-D imaging capability. Without any fixation or labeling, 3-D images of live cells can be obtained with high spatial resolution (down to 110 nm). Furthermore, HT provide quantitative imaging capability : RI maps of a cell are precisely and quantitative measured, from which various cellular analysis can be followed. In this talk, we will present the recently developed 3-D holotomography setup using a dynamic mirror device. In particular, we will discuss the principle of HT techniques and the previous application in the field of hematology, cell biology, neuroscience, and infectious diseases. The outcome demonstrates outstanding visualization of 3D refractive index maps of live cells, which will be potentially used in various applications in biology and medicine. we will also discuss about the commercialzation of the technique.
Shanghai Jiao Tong University, China
Mingjun Ren received Ph.D. degrees from The Hong Kong Polytechnic University in 2012 and has been a research associate and postdoctoral fellow from 2012 to 2015 and now an assistant professor at the school of mechanical engineering in Shanghai Jiao Tong University. His research interest includes multi-sensor metrology, freeform surface characterization, in-situ measurement and instrumentation, measurement uncertainty analysis. He has been principle/co-principle investigator of a number of research projects, including National Natural Science of Foundation of China, Hong Kong Innovation Technology Fund, and Hong Kong Research Grant Council Grant, which covers research areas from ultra-precision machining technology to measurement science, and published more than 50 papers in various refereed journals. He is now research affiliate of CIRP, Youth Committee of China Instrument and Control Society.
Speech title: Dependant Gaussian Process for Intelligent Surface Metrology
Abstract: Complex surfaces superimposing functional structures are becoming popular in high-value-added industries, such as astronautics, new energy, and biomedicine, for their excellent optical and mechanical properties. However, the measurement of such types of surfaces remains challenging task and becomes a cutting-edge problem in precision surface measurement. This paper presents a dependent Gaussian process multi-sensor measurement system to address this challenge. The method establishes the mapping from measured data to surface model in the form of spatial covariance matrix by taking the Gaussian process as mathematical foundation, and the multi-scale datasets obtained by different sensors are then fused via dependent Gaussian process based on the auto-correlation and cross-correlation among the datasets. The statistic nature of the method not only possesses great flexibility in modelling various complex surfaces, but also can give credibility to the measurement results based on full Bayesian inference. Experital study is also given to demonstrate the effectiveness of the proposed method.
Beihang University, China
Professor Huijie Zhao received her PhD in 1994 in Harbin Institute Technology (HIT). Now she is the CPC party chief of School of Instrumentation Science and Opto-electronics Engineering, Beihang University. Her research interests include 3-D measurement techniques and application in Industry, Hyperspectral imaging techniques, Polarization detection techniques, Optical Imaging System Modelling, Simulation and evaluation, Hyperspectral data Processing, etc.. She is the (general) council member of several academic societies including The International Society for Optical Engineering (SPIE), Precision Machinery TC of China Instrument and Control Society, China Society of Image and Graphics, Beijing Society of Image and Graphics, etc.. She has won national prize twice, ministerial prize four times. She has been the PI of more than 50 research projects, including the major instrument project of National Natural Science Foundation, National 863 Project, China Geological Survey project etc. and awarded the Second Award of National Invention twice. She has published more than 100 research papers and hold more than 50 National Invention Patents of China. She has supervised more than 20 PhD candidates so far.
Speech title: 3D Data Acquisition, Modeling and Presentation for Ancient Architecture
Abstract: There are more than twenty thousands ancient architectures need to be carefully repaired or reconstructed in China. Usually, the 3D model with color texture of the ancient architecture needs to be established before the repair or the reconstruction, either for the purpose of digital archives or for the further analysis of the building structure. The 3D point cloud acquisition scheme and the working process are introduced. That is, the off-the-shelf time-of-flight type laser scanner is used to acquire the global 3D point cloud of the building and a self-developed stereo vision based local scanner is used to acquire the detailed, high accuracy 3D point cloud of the local part where may have few data during the global acquisition due to occlusion. The point cloud registration between the global data and the local data based on the intrinsic features of the building is also presented. The 3D modeling from the point cloud and the color texture mapping process of the ancient architecture are discussed then. The dynamic and interactive presentation software platform is then built to make the outer and inner cruise with the model for the VR or Intelligent tourism applications, as well as to cross-section the model for the building structure analysis applications.
Shanghai Jiao Tong University, China
Yan Hao is an assistant professor of Shanghai Jiao Tong University, School of Electronic Information and Electrical Engineering. Her research interest includes digital holography for 3D imaging, 3D deformation measurement and quantitative phase imaging techniques for bio-applications.
Speech title: Digital Holography and Simultaneous Three-Dimensional (3D) Displacement Measurement
Abstract: In this talk, a simultaneous three-dimensional (3D) displacement measurement technique based on the combination of off-axis digital holography (DH) and digital imaging correlation (DIC) is presented. The current DH-based 3D displacement measurement technique needs three sets of DH setups, and only the phase images are utilized in measurements, with all the intensity images discarded. In contrast, we propose a simultaneous 3D displacement measurement technique which only adopts a single off-axis DH setup. In the proposed technique, the phase images are used to extract out-of-plane displacements, but the intensity images, instead of being discarded, are processed by an intensity correlation algorithm to retrieve in-plane displacement components. Because the proposed technique fully takes advantage of all the information obtained by an off-axis DH without additional optical arrangements, it is simpler and more practical than the existing DH-based 3D displacement measurement technique.
Shanghai Academy of Fine Arts, China
Jiang Fei is an Associate Professor at Shanghai Academy of Fine Arts Shanghai University. His interdisciplinary background spans three areas: design, media arts and mechanical engineering. His works focus on interaction design, wearable sensing, and immersive experience.
Speech title: The Art of Projection
Abstract: The Art of Projection investigates the history and current state of the use of projected images in art, moving from the screen to the exhibition space and back again. The interative artists always strive to create an ultimate experience the audience will never forget. The projected space pushes the viewer beyond the everyday limits of perception. It may take many different forms and uses many different technologies to achieve the aim.
Tianjin University, China
2004.06-2007.06, Tianjin University, Major in Measurement Technology and Instrumentation, PhD
1992.09-1995.10, Tianjin University, Major in Optical Engineering, Master of Engineering
1983.09-1987.07, Tianjin University, Major in Optoelectronics, Bachelor’s Degree
Speech title: The Rational Design of Terahertz Attenuated Total Reflection (THz-ATR) Prism
Abstract: Terahertz (THz) spectroscopy offers a new dimension to reveal the low frequency vibrations and rotations of biomolecules, as well as the dynamic process on sub-picosecond to picosecond scale. Together with its nonionizing property, it is suitable for the measurement of biological samples. However, water is a double-edged sword in the field of THz biomedical application. On the one hand, it is the main component in biological system, making it essential in the study of dynamic biological process. On the other hand, water is a strong absorber to THz waves. A reasonable way to overcome this restriction is the terahertz attenuated total reflection (THz-ATR) system, avoiding the high power loss of THz wave during the penetration of water layer. Due to the symmetry of the optical path, the cross-section shape of the prism is determined to be an isosceles triangle. Combined with the law of refraction and geometrical relationship of triangle, the function relationship between the base angle of ATR prism and the incident angle θ is obtained. Substituting the value of incident angle as 30°, 45° and 60°, the base angle of ATR prism is determined to be designed as 13.42°, 30.34° and 48.88°.
Nanjing University of Science and Technology, China
Zhanghua Han is a Professor of Terahertz Optics at Advanced Launching Co-innovation Center, Nanjing University of Science and Technology. He obtained his bachelor’s degree from Zhejiang University in 2003, where he also got his PhD degree in 2008. After that he did his postdoctoral researches first at the University of Alberta, Canada working on the fabrication of plasmonics devices and then at the University of Southern Denmark on active plasmonics. Before he moved to Nanjing at the beginning of 2018, he had worked at China Jiliang University as a professor for four years. He has published around 60 papers with a total citation number over 2000 by SCI. His current research interest focuses on Terahertz plasmonics.
Speech title: Spoof Surface Plasmon based Antennas for Terahertz Applications
Abstract: Spoof surface plasmons, supported by corrugated metal surfaces, mimick the properties of surface plasmon polaritons. This circumvents the problem that at low frequencies like terahertz or microwave bands, metals behave like perfect electric conductors and don't support regular surface plasmons. Based on spoof surface plasmons, we have investigated terahertz antennas whose behavior is quite similar to optical nanoantennas, exhibiting huge local electric enhancement. This opens up a variety of possibilities in terahertz sciences, including emission control, sensing enhancement and nonlinear applications.
Fudan University, China
Xiangchao Zhang, born in 1982, is currently an associate professor at Fudan University, China. He is a member of ISO TC/201, SPIE, ASPE, IEEE, and Shanghai Laser Society, respectively, and a trustee of Precision Machinery Sub-Society of China Instrument and Control Society. He graduated from University of Science and Technology of China in 2005 and received his PhD degree at University of Huddersfield, UK in 2009. In 2011, he joined Department of Optical Science and Engineering, Fudan University, China. Dr Zhang’s research interests include precision optical measurement, surface metrology and image processing. He has published more than 70 papers and leaded several research grants. He won a Second Prize of Science and Technology Development, Ministry of Education of China in 2016.
Speech title: High Precision Measurement and Reliable Characterization of Surface Defects of Large Complex Components
Abstract: Surface defects and local textures are of significance for the functionalities of optical surfaces, but the full-area measurement and reliable characterization of large complex components are of great challenges to surface metrology. A flexible microscopic system based on the fiber interferometry is designed, so that the surfaces can be measured by full-area scanning. The problems of measurement signal loss and speckle noise disturbance are solved by digital holographic reconstruction. The resolution loss due to the mosaicing effect of the fibre bundle is solved by superreolution data fusion of multiframe images. The local morphologies are recognized and assessed by shift-invariant multi-scale transformations.
Fudan University, China
Prof. Dr. L.B. Kong received the B.Eng. and M.Eng. degrees from Harbin Institute of Technology, Harbin, China, and the PhD. degree from The Hong Kong Polytechnic University, Hong Kong. His research interests include: process modeling and optimization of ultra-precision manufacturing, freeform machining and measurement, design and generation of bionic functional structures, multi-sensor and multi-spectrum metrology, optical engnieerng, etc. Dr. Kong joined Advanced Optical Manufacturing Centre as a Research Assistant in 2004 and then a Research Associate in 2008. He got a visiting scholar to Centre for Precision Technology in Huddersfield University, UK, in 2007. Dr. Kong held a position as a Scientific Officer in Partner State Key Laboratory of Ultra-precision Machining Technology at The Hong Kong Polytechnic University during 2011 to 2015, and a Senior Research Fellow from 2015-2016. Currently Dr. Kong is a Research Professor in Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing of Fudan University, Shanghai, China. He has published more than 100 research papers in various international journals and conferences, authored /co-authored 2 book chapters, and got a number of granted patents and a series of awards. He is a Research Affiliate of The International Academy for Production Engineering (CIRP), a member of American Society of Mechanical Engineers (ASME) and The Institute of Electrical and Electronics Engineers (IEEE) in USA, a member of The Institution of Engineering and Technology (IET) in UK, a senior member of Chinese Mechanical Engineering Society in China, a board member of Chinese Journal of Mechanical Engineering, a standing Committee member of Optical Manufacturing Branch of The Chinese Optical Society of China, a board member of Chinese Optical Engineering Society, and an observer member of ISO/TC213 in HKSAR.
Speech title: A 3D Measurement System for Microstructures Based on Light Field Optics
Abstract: The 3D Measurement of microstructures with rich information has draw great interests from academic research and industries. In this walk, a new approach for measuring 3D microstructures based on light field optics is presented. In the system, a traditional microscope was modified by inserting a microlens array between the camera sensor and the objective lens, and hence a bunch of regular sub-images are recorded by the photosensor, which then are used to reconstruct a 3D image by the developed algorithsm. In other words, the proposed 3D measurement system can be transformed from a regular microscope, in which the light field information of the microstructures is detected and acquired by the microlens array. A prototype measurement system has been developed and a series of simulation and experimental studies were carried out for measuring microstructures. The preliminary results verified the validity of the proposed 3D measurement system, which indicates the 3D information with a wide view angle for the sampel is obtained through only one exposure in a flash time, and a high resolution of the pictures captured can be achieved provided with the specification of the microscope. The proposed 3D measuring system with particular illumination can also be applied to biomedical applications.
Huazhong University of Sciency & Technology, China
Jian Wang, PhD, Associate Research Scientist in Huazhong University of Science & Technology (HUST). He obtained his BEng degree in the University of Science and Technology of China in 2008, and PhD degree in the University of Huddersfield (UK) in 2013. Then he work successively in the National Physical Laboratory Engineering Measurement Division and the University of Huddersfield EPSRC Centre for Innovative Manufacturing as a research fellow. Since 2015, he entered into the School of Mechanical Science & Engineering of the HUST. His research focuses include 3D machine vision, multi-sensor distributive measurement and engineering surface sampling, modelling and evaluation. He is a member of the IET and the Chinese Society on Interchangeability and Measurement Research. He has joined three EPSRC/ERC/FP7 projects and is hosting a NSFC project, published a dozen high-reputation journal research papers and one of them was an annual high-light of the Meas. Sci. Technol. He is also a peer-reviewer of the journals including Precis. Eng. and Surf. Topogr.: Metrol & Prop.
Speech title: Potentials of High-Speed Super-Resolution 3D Measurement via Machine Vision Fusion
Abstract: Manufacturing of high-dynamic-range surface products with both large area and tiny structures have been increasingly popular due to their exceptional and controllable functionalities. However, a critical challenge is that there is a lack of high-speed in-line metrological solutions to inspect these products with both reasonable large area coverage and high resolution. In this presentation, an effective sensor fusion solution and algorithm to achieve super-resolution three-dimensional surface topography measurement within seconds of computation is introducd. This technique is conducted by integrating a low-resolution depth sensor and a high-resolution 2D vision sensor and fusing their data through a natural illumination-imitated lighting model. With both simulation and real measurement experiments, the effectiveness of the proposed solution has been demonstrated.
Beijing Insititue of Technology, China
Xiaodi Tan, graduated from the Optical Department of Shandong University in 1984,he obtained a Master’s Degree from the Optical Engineering Department of the Beijing Institute of Technology. His Doctoral thesis on "Optical Secure Holographic Storage Systems" was completed at The University of Tokyo, Institute of Industrial Science, in the Laboratory of Kuroda-Shimura in 2001. He was a Senior Engineer of the Technology Division in OPTWARE Corporation, researching and developing the next generation of optical storage systems. And he was a Senior Technology Analyst, Distinguished Engineer and Optical Technology Manager of Core Device Development Group in Sony Corporation. He is currently a professor at the School of Optoelectronics in Beijing Institute of Technology. His research interests are in information optics: holographic storage, optical information display, optical devices, etc.
Speech title: 360° Realistic 3D Image Display using “Holo-Table”
Abstract: The realistic 3D image display using Direct Light Scanning Method, so-called Holo-Table has been proposed, and will be demonstrated in this presentation. This method requires projecting the directional 2D images corresponding directions by parallel rays same as these from the 3D objects. Therefore, Holo-Table allows us to observe reconstructed 3D images without having any special glasses. Thus displayed 3D image has smooth motion parallax, and the viewing position is not restricted.
DeYi Times(Tianjin) Science&Technology Co. LTD, China
Dr. Yang Xiufeng received her B.A and Ph.D degrees in physics and optics from Nankai University and M.E degree in Communication from Tianjin University. She performed research in optical fiber device,fiber lasers and fiber sensing technology at Institute for Infocomm Research, Nanyang Technological University Singapore and she also worked as a Professor in Tianjin University of Science and Technology China.
Speech title: Fiber Optics Sensors and Their Applications
Abstract: The use of optical fiber itself and devices as sensing elements has grown over the two decades mainly due to their advantages over traditional sensors because of their small size, immune to EMI, ability to work in demand harsh environment etc,. In this paper, the classification of the fiber sensors is briefly reviewed, and we describe the several sensing technologies such as fiber micro bending sensor, fiber laser sensor, fiber Bragg grating sensor and their applications in health care monitoring and environment health monitoring.
Xi'an University of Posts & Telecommunications, China
Speech title: Fabrication of Novel Long-Period Fiber Gratings with a CO2 Laser Fusion Splicer
Abstract: A new scheme for fabricating microtapered long-period fiber gratings (LPFGs) and helical LPFGs is proposed and demonstrated successfully by periodically tapering and twisting a standard single-mode fiber, respectively, using a CO2 laser fusion splicer as heater. In comparison to previous fabrication methods, our scheme can significantly improve the quality of the microtapered and helical LPFGs. Superior sensing characteristics of them are also demonstrated experimentally. Considering the simple and flexible fabrication process as well as the high quality of fabricated gratings, we believe that this may offer a simpler and alternative choice to current filters or sensing applications.
Guangdong University of Technology, China
Yanzhou Zhou received the B.S. and M.S. degrees from Harbin Institute of Technology, Harbin, China, in 1981 and 1992, respectively, and the Ph.D. degree in optical engineering & structure intergrety from Loughborough University, UK, in 2007 .He is currently a Professor with the School of Automation, Guangdong University of Technology, Guangzhou, Guangdong, China. His research interests include optical signal and image processing, mechanical measurement etc.
Speech title: Theroy ,system and application on 3D optical interferometry
Abstract: Many important components are composed of high-precision and complex multilayer interfaces with a depth of centimeter and with an interlayer spacing of micrometers. The theory, system and method on their high- precision measurement have been started just years ago. In this project, theory and method of multi-channel blind source optical 3D interferometric signal separation is proposed. It challenges 4D (light intensity, x, y, z) optical interferometric difficulties with high-precision, cross-scale and large dynamic range in the internal interface contour measurement. Firstly, dual channel optical wavenumber-scanning interferometries in the time and space domain are developed. Secondly, the blind source separation algorithm of dual channel interferometric signals is studied; super-resolution image registration algorithm is designed; based on the ray tracing theory, the separation algorithm between the optical refractive index and the 3D interface contour in the multilayer structure are explored. Finally, taking a nanometer precision motion platform and a laser interferometer as references, multilayer slide is measured to verify the accuracy of the system and method; photovoltaic organic thin-film and optical lens are used as typical components and their 3D contour and center of curvature are measured with high accuracy. In the end, interlayer spacing measurement resolution of 1μm and 3D contour measurement resolution of 1nm in the transparent or translucent multilayer structure are achieved. It may be a standard method for high-precision measurement of 3D interface coutour inside complex multilayer structure, and can be widely applied.
Southeast University, China
Xiaoyuan He received his BS degree from the Department of Applied Mechanics at Nanjing University of Science and Technology, China, in 1982, MS degree from the Department of Mathematics and Mechanics at Southeast University in Nanjing, China, in 1987, and PhD from the Institute of Mechanics Southwest Jiaotong University, Chengdu, China, in 1994. Currently, he is a professor in the Department of Engineering Mechanics at Southeast University. His research interests include 3D shape and deformation measurement by optical method and image processing techniques.
Speech title: Recent Advances of Several Key Problems in Digital Image Correlation
Abstract: Digital image correlation (DIC) technique is now the most popular deformation measurement technique in experimental solid mechanics. This paper reports the important research progress in DIC method, which is achieved by the photomechanics research group affiliated to Institute of Mechanics at Southeast University. The main progress as follows: (1) Through theoretical error analysis of inverse compositional Gauss-Newton (IC-GN) algorithm in DIC, a new theoretical error formula was proposed, which further proves the comprehensive advantages of inverse compositional Gauss-Newton algorithm in improvement of computation speed and noise robustness; (2) Adopting new theoretical error formula, the optimization and fabrication method of digital speckle patterns (DSPs) was developed to ensure the consistency and accuracy of measured results; (3) Based on camera array and image stitching technology, a super-resolution DIC method was developed, which greatly improves strain measurement resolution of DIC; (4) A calibration method of 3D system with large field of view was proposed, which can realize real-time calibration of extrinsic parameters of a 3D measurement system and automatic correction of camera position and orientation in a multi-camera measurement system; (5) A portable in situ 3D measurement instrument and a multi-scale DIC measurement system were developed and real-time 3D DIC was realized, which further meet the application requirements of DIC method in industrial online detection and medical field.
Nanyang Technological University, Singapore
Dr. Fu Yu received his bachelor's degree from Shanghai Jiao Tong University in 1991, and his Master’s and Doctoral Degree from National University of Singapore (NUS). His research areas included optical coherent detection, non-destructive testing, optical dynamic testing and experimental mechanics. He has published more than 70 publications in journals and proceedings. In 2006, he was awarded the prestigious Alexander von Humboldt research fellowship by the German Government and worked with Institut für Technische Optik (ITO), University of Stuttgart. In 2010, he won the Best Paper Award on the ISOT 2010 conference in Canada. He joined Temasek Laboratories of Nanyang Technological University in 2009. In July 2011, Dr. Fu received the prestigious Temasek Research Fellowship from Singapore’s Defence Ministry and Nanyang Technological University to be a Principal Investigator in the area of coherent laser detection. His research was mainly on applications of laser coherent detection in defence and security area. Dr Fu is now a senior member of SPIE.
Speech title: Evaluation of Laser-Induced Particle Vibration Using Laser Doppler Vibrometry
Abstract: Photoacoustic/photothermal spectroscopy is an established technique for detection of chemicals and explosives. However, prior sample preparation is required and the analysis is conducted in a sealed space with a high-sensitivity sensor coupled with a lock-in amplifier, limiting the technique to applications in a controllable laboratory environment. Hence, this technique may not be suitable for defense and security applications where the detection of explosives or hazardous chemicals is required in an open environment at a safe standoff distance. In this study, trace chemicals and explosives in small particles were excited by an intensity-modulated quantum cascade laser (QCL), while a laser Doppler vibrometer (LDV) was applied to detect the vibration signal resulting from the photocoustic/photothermal effect. The photo-vibrational spectrum obtained by scanning the QCL’s wavelength in MIR range, coincides well with the corresponding spectrum obtained using typical FTIR equipment. The experiment in short and long standoff distances demonstrated that the LDV is a capable sensor for chemical detection in an open environment.