Real-time Video Rate Terahertz Digital Holographic Imaging System PDF Download
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Author: Mark Humphreys
Publisher:
ISBN:
Category : Holography
Languages : en
Pages : 0
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Author: Mark Humphreys
Publisher:
ISBN:
Category : Holography
Languages : en
Pages : 0
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Book Description
Author: Chung J. Kuo
Publisher: John Wiley & Sons
ISBN: 0471462896
Category : Technology & Engineering
Languages : en
Pages : 222
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Book Description
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.
Author: Christopher Shakespear Nilsen
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 362
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Author: Assaf Levanon
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
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Author: Xurong Li
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
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.
Author: Bahram Javidi
Publisher: SPIE-International Society for Optical Engineering
ISBN:
Category : Computers
Languages : en
Pages : 366
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Book Description
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.
Author: Sennan David Sulaiman
Publisher:
ISBN:
Category :
Languages : en
Pages : 100
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Book Description
Digital holography has received recent attention for many imaging and sensing applications, including imaging through turbulent and turbid media, adaptive optics, three-dimensional projective display technology and optical tweezing. It holds several advantages over conventional imaging and wavefront sensing, chief among these being significantly fewer and simpler optical components and the retrieval of complex field. A significant obstacle for digital holography in real-time applications, such as wavefront sensing for high-energy laser systems and high-speed imaging for target tracking, is the fact that digital holography is computationally intensive; it requires iterative virtual wavefront propagation and hill-climbing algorithms to optimize sharpness criteria. This research demonstrates real-time methods for digital holography based on approaches for optimal and adaptive identification, prediction, and control of optical wavefronts. The methods presented integrate minimum-variance wavefront prediction into dynamic digital holography schemes to accelerate the wavefront correction and image sharpening algorithms. Further gains in computational efficiency are demonstrated in this work with a variant of localized sharpening in conjunction with predictive dynamic digital holography for real-time applications. This "subspace correction" method optimizes sharpness of local regions in a detector plane by parallel independent wavefront correction on reduced-dimension subspaces of the complex field in a spectral plane.
Author: Darrell W. James
Publisher:
ISBN:
Category :
Languages : en
Pages : 226
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Book Description
Author: HANS. BROTHERTON-RATCLIFFE BJELKHAGEN (DAVID.)
Publisher: CRC Press
ISBN: 9780367576431
Category :
Languages : en
Pages : 664
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Book Description
Ultra-high resolution holograms are now finding commercial and industrial applications in such areas as holographic maps, 3D medical imaging, and consumer devices. This handbook provides complete coverage of real-time colour holographic processes and applications. In addition to discussing the optics and theory behind these holographic systems,
Author:
Publisher:
ISBN:
Category : Optics
Languages : en
Pages : 548
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Book Description
