Download or read book Real time Video Rate Terahertz Digital Holographic Imaging System written by Mark Humphreys and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Three Dimensional Holographic Imaging written by Chung J. Kuo and published by John Wiley & Sons. This book was released on 2003-04-08 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive survey of the state of the art in 3-D holographic imaging techniques and applications This book introduces the general concepts of both real-time and non-real-time 3-D holographic imaging techniques for scientific and engineering applications. It offers readers a fundamental understanding of the concepts of 3-D holographic imaging as well as cost-effective design and implementation. World-renowned experts in the field provide in-depth discussion of the following topics: * Holograms of real and virtual point trajectories * Self-stabilized real-time holographic recording * Principles and applications of optical scanning holography * Tangible, dynamic holographic images * Holographic laser radar * Preliminary studies on compression of interference patterns in electronic holography * Photoelectronic principles, components, and applications * Design and implementation of computer-generated hologram and diffractive optical elements * Catastrophe analysis as the basis for visual perception Three-Dimensional Holographic Imaging is the most complete survey available of the fundamental topics in the field, ideal for electrical engineers, optical scientists, and advanced CAD/CAM systems engineers engaged in the design and construction of advanced imaging systems.
Download or read book Terahertz Focal Plane Array for Terahertz Time Domain Imaging written by Xurong Li and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Imaging systems operating in the terahertz part of the electromagnetic spectrum are in great demand because of the distinct characteristics of terahertz waves in penetrating many optically-opaque materials and providing unique spectral signatures of various chemicals. However, the use of terahertz imagers in real-world applications has been limited by the slow speed, large size, high cost, and complexity of the existing imaging systems. These limitations are mainly imposed due to the lack of terahertz focal-plane arrays (THz-FPAs) that can directly provide the frequency-resolved and/or time-resolved spatial information of the imaged objects. During my doctoral studies, I designed, fabricated, and characterized the first THz-FPA that can directly provide the spatial amplitude and phase distributions, along with the ultrafast temporal and spectral information of an imaged object. It consists of a two-dimensional array of ~0.3 million plasmonic photoconductive nanoantennas optimized to rapidly detect broadband terahertz radiation with a high SNR. Terahertz time-domain imaging on amplitude and phase objects is demonstrated in both terahertz lens-free and lens-based imaging systems. By eliminating the need for raster scanning and spatial terahertz modulation, our THz-FPA offers more than a 1000-fold increase in imaging speed compared to the state-of-the-art. The high imaging speed enables the first terahertz video taken in a terahertz time-domain imaging system with a frame rate of 16 fps. The unprecedented rich information in the terahertz time-domain imaging data can facilitate many new applications. As the first proof-of-concept, we utilized the multispectral nature of the amplitude and phase data captured by the plasmonic photoconductive THz-FPA to realize pixel super-resolution imaging of objects. We successfully imaged and super-resolved etched patterns in a silicon substrate and reconstructed both the shape and depth of these structures with an effective number of pixels that exceeds 1 kilo pixels. We also super-resolved the terahertz video at 16 fps of a water flow in three adjacent plastic pipes using a holographic reconstruction algorithm. Beyond these proof-of-concept super-resolution demonstrations, the unique capabilities enabled by our plasmonic photoconductive THz-FPA offer transformative advances in a broad range of applications that use hyperspectral and three-dimensional terahertz images of objects for e.g., industrial inspection, security screening, and medical diagnosis, among others.
Download or read book Design of Real Time Inexpensive THz Imaging Video Systems written by Assaf Levanon and published by . This book was released on 2015 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Three dimensional Video and Display written by Bahram Javidi and published by SPIE-International Society for Optical Engineering. This book was released on 2001 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of SPIE present the original research papers presented at SPIE conferences and other high-quality conferences in the broad-ranging fields of optics and photonics. These books provide prompt access to the latest innovations in research and technology in their respective fields. Proceedings of SPIE are among the most cited references in patent literature.
Download or read book A Real Time Motion sensing Video Imaging System written by Darrell W. James and published by . This book was released on 1991 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optics Letters written by and published by . This book was released on 2006 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Non iterative Methods for Image Improvement in Digital Holography of the Retina written by Julie Rivet and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the increase of the number of people with moderate to severe visual impairment, monitoring and treatment of vision disorders have become major issues in medicine today. At the Quinze-Vingts national ophthalmology hospital in Paris, two optical benches have been settled in recent years to develop two real-time digital holography techniques for the retina: holographic optical coherence tomography (OCT) and laser Doppler holography. The first reconstructs three-dimensional images, while the second allows visualization of blood flow in vessels. Besides problems inherent to the imaging system itself, optical devices are subject to external disturbance, bringing also difficulties in imaging and loss of accuracy. The main obstacles these technologies face are eye motion and eye aberrations.In this thesis, we have introduced several methods for image quality improvement in digital holography, and validated them experimentally. The resolution of holographic images has been improved by robust non-iterative methods: lateral and axial tracking and compensation of translation movements, and measurement and compensation of optical aberrations. This allows us to be optimistic that structures on holographic images of the retina will be more visible and sharper, which could ultimately provide very valuable information to clinicians.
Download or read book Introduction to Modern Digital Holography written by Ting-Chung Poon and published by Cambridge University Press. This book was released on 2014-01-23 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building up from the basic principles of optics, this straightforward introduction to digital holography, aimed at graduate students, engineers and researchers, describes modern techniques and applications, plus all the necessary underlying theory. Supporting Matlab code is available for download online, and homework problems are accompanied by an instructor solution manual.
Download or read book Holography 3D Imaging and 3D Display written by Ting-Chung Poon and published by MDPI. This book was released on 2021-02-19 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern holographic techniques have been successfully applied in many important areas, such as 3-D inspection, 3-D microscopy, metrology, and profilometry, augmented reality, and industrial informatics. This Special Issue covers selected pieces of cutting-edge research works, ranging from low-level acquisition, to high-level analysis, processing, and manipulation of holographic information. The Special Issue also serves as a comprehensive review of existing state-of-the-art techniques in 3-D imaging and 3-D display, as well as broad insights into the future development of these disciplines. The Special Issue contains 25 papers in the field of holography, 3-D imaging, and 3-D display. All the papers underwent substantial peer review under the guidelines of Applied Sciences.
Download or read book Information Metamaterials written by Tie Jun Cui and published by Cambridge University Press. This book was released on 2021-02-18 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metamaterials have attracted enormous interests from both physics and engineering communities in the past 20 years, owing to their powerful ability in manipulating electromagnetic waves. However, the functionalities of traditional metamaterials are fixed at the time of fabrication. To control the EM waves dynamically, active components are introduced to the meta-atoms, yielding active metamaterials. Recently, a special kind of active metamaterials, digital coding and programmable metamaterials, are proposed, which can achieve dynamically controllable functionalities using field programmable gate array (FPGA). Most importantly, the digital coding representations of metamaterials set up a bridge between the digital world and physical world, and allow metamaterials to process digital information directly, leading to information metamaterials. In this Element, we review the evolution of information metamaterials, mainly focusing on their basic concepts, design principles, fabrication techniques, experimental measurement and potential applications. Future developments of information metamaterials are also envisioned.
Download or read book Visualizing Chemistry written by National Research Council and published by National Academies Press. This book was released on 2006-06-01 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientists and engineers have long relied on the power of imaging techniques to help see objects invisible to the naked eye, and thus, to advance scientific knowledge. These experts are constantly pushing the limits of technology in pursuit of chemical imagingâ€"the ability to visualize molecular structures and chemical composition in time and space as actual events unfoldâ€"from the smallest dimension of a biological system to the widest expanse of a distant galaxy. Chemical imaging has a variety of applications for almost every facet of our daily lives, ranging from medical diagnosis and treatment to the study and design of material properties in new products. In addition to highlighting advances in chemical imaging that could have the greatest impact on critical problems in science and technology, Visualizing Chemistry reviews the current state of chemical imaging technology, identifies promising future developments and their applications, and suggests a research and educational agenda to enable breakthrough improvements.
Download or read book Metasurface Holography written by Zi-Lan Deng and published by Springer Nature. This book was released on 2022-05-31 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: The merging of metasurface and holography brings about unprecedented opportunities for versatile manipulation of light in terms of both far-field wavefront and near-field profile. In this book, a brief evolving history from surface plasmon polariton holography to metamaterial holography and finally to metasurface holography is introduced at first. Basic physical mechanisms that govern the phase modulation rules behind metasurface holography design are discussed later. Next, extended functionalities such as arbitrary polarization holography, vectorial holography, full-color holography, and hybrid holography achieved in the metasurface platform are presented. Surface wave and metagrating holography that bridges the on-chip surface wave and free-space wave is also introduced. In the end, we envisage practical applications of high-fidelity 3D holographic display, high-secure encryption, and high capacity digital encoding and also indicate remaining challenges based on metasurface holography.
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Terahertz Technologies written by Ho-Jin Song and published by CRC Press. This book was released on 2015-04-15 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: Terahertz waves, which lie in the frequency range of 0.1-10 THz, have long been investigated in a few limited fields, such as astronomy, because of a lack of devices for their generation and detection. Several technical breakthroughs made over the last couple of decades now allow us to radiate and detect terahertz waves more easily, which has trigg
Download or read book Electrical Electronics Abstracts written by and published by . This book was released on 1997 with total page 2304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book THz and Security Applications written by Carlo Corsi and published by Springer. This book was released on 2014-05-06 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings comprise invited papers from highly experienced researchers in THz technology and security applications. THz detection of explosives represents one of the most appealing technologies to have recently emerged in dealing with terrorist attacks encountered by civil security and military forces throughout the world. Discussed are the most advanced technologies and developments, the various points of operational strength and weaknesses as well as are suggestions and predictions the best technological solutions to overcome current operational limits. The current status of various levels of cooling in THz detectors, sources and associated electronics are also addressed. The goal was to provide a clear view on the current technologies available and the required advances needed in order to achieve more efficient systems. This goal was outlined in part by establishing the baseline of current uncertainty estimations in physics-based modelling and the identification of key areas which require additional research and development.
