Download or read book Optical Metrology by Prescription Retrieval and Transverse translation Diversity Phase Retrieval written by Dustin B. Moore and published by . This book was released on 2016 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Phase retrieval (PR) has been integral to the success of wavefront sensing for alignment of space telescope systems, like NASA's Hubble Space Telescope and the James Webb Space Telescope, and it has shown promise for optical shop testing. It requires that an optical system image a target such as a star or an illuminated pinhole onto a detector array. The measured intensity, the point spread function (PSF), becomes input to a nonlinear optimization process which finds wavefront aberrations that predict PSFs consistent with the measured PSFs. Transverse-translation-diversity phase retrieval (TTDPR) is a ptychographic algorithm in which multiple PSFs are acquired for various translations of a subaperture. The subaperture translates in a plane conjugate to the exit pupil. We assess informationtheoretic limits on the ability to estimate subaperture translation, essential for accurate metrology, as a function of the aberrations of the system. Attention is given to the case that an unknown linear phase aberration, or equivalent detector or target motion, is present that varies with each PSF. We then introduce unknown-transverse translation diversity phase retrieval: an algorithm that estimates the direction of translation and the distance traveled by the subaperture from one PSF to the next. Uniquely, it estimates translations without prior information about the approximate direction of translation. It also estimates unknown point target motion and rotations of the subaperture between PSF acquisitions from the PSF data. In prescription retrieval, the unknowns being searched for are the prescription parameters of a sequential raytrace of the optical system. This search was previously hampered by the use of gradients calculated by the method of finite-differences (FD). Gradients calculated using FD become slow for problems involving many unknowns, and/or a large amount of PSF data to be fit. We use the reverse mode of algorithmic differentiation (RMAD) to find fast analytic gradient computations for metrics depending on raytraces of systems including freeform surfaces. This is combined with a customized diffraction integral model to perform prescription retrieval using computationally-efficient gradient functions. Finally, we show a simulated example where the use of RMAD gradients speeds computation by a projected 10, 000 times"--Pages ix-x.
Download or read book Advances in Optical Surface Metrology by Phase and Prescription Retrieval written by Aaron M. Michalko and published by . This book was released on 2020 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This thesis presents advances in the application of phase retrieval techniques to optical metrology of spherical and freeform surfaces. We explore metrology configurations using transverse translation-diverse phase retrieval (TTDPR), in which translating subaperture illumination is projected on the test surface. The wavefront aberration, and from it surface error, can be reconstructed from measured reflected intensities. TTDPR is advantageous for freeform surface metrology due to its relatively simple hardware requirements and demonstrated accuracy in other fields. Through simulations we probe TTDPR performance as a function of various parameters including illumination beam softness, detector signal-to-noise ratio and position uncertainty of the illumination. We report on the laboratory measurement of a concave spherical test surface using TTDPR, which agrees with an interferometric measurement to 0:006[lambda] root-mean-square (RMS) with certain terms removed. We report on measurements of a concave freeform using TTDPR. Freeform surface reconstructions from two disjoint datasets agree to 13 nm RMS, or 0:02[lambda] RMS at [lambda] = 632:8nm. Next we explore configurations suitable for metrology of convex surfaces. We explore a configuration using converging source illumination and a moving test surface. We discuss a suitable algorithm, prescription retrieval, with which we directly reconstruct surface prescription terms from measured intensities using combined ray-tracing and diffraction modeling. A prescription retrieval algorithm is demonstrated through simulation and ultimately a convex surface measurement using the technique is demonstrated"--Pages xi-xii.
Download or read book Wireless Communication And Sensor Network Proceedings Of The International Conference Wcsn 2015 written by Salah Bourennance and published by World Scientific. This book was released on 2016-06-29 with total page 1047 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume collects the most up-to-date, comprehensive and state-of-the-art knowledge on wireless communication, sensor network, network technologies, services and application.Written by world renowned researchers, each chapter is original in content, featuring high-impact presentations and late-breaking contributions.Researchers and practitioners will find this edition a useful resource material and an inspirational read.
Download or read book Phase Retrieval and Diversity in Adaptive Optics written by Robert Arthur Gonsalves and published by . This book was released on 1982 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical Metrology written by Kjell J. Gåsvik and published by John Wiley & Sons. This book was released on 2003-04-11 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: New material on computerized optical processes, computerized ray tracing, and the fast Fourier transform, Bibre-Bragg sensors, and temporal phase unwrapping. * New introductory sections to all chapters. * Detailed discussion on lasers and laser principles, including an introduction to radiometry and photometry. * Thorough coverage of the CCD camera.
Download or read book Optical Metrology and Optoacoustics in Nondestructive Evaluation of Materials written by Zinoviy Nazarchuk and published by Springer Nature. This book was released on 2023-05-23 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book includes the description, modeling and realization of new optical metrology techniques for technical diagnostics of materials. Special attention is paid to multi-step phase shifting interferometry with arbitrary phase shifts between interferograms, phase shifting and correlation digital speckle pattern interferometry, optical-digital speckle correlation, and digital image correlation, as well as dynamic speckle patterns analysis. Optoacoustic techniques can be treated as a separate branch of optical metrology and can solve many problems of technical diagnostics, including detection and localization of subsurface defects in laminated composite materials. The utility of such techniques can be increased by illumination of the object via acoustic waves at certain frequencies. Hence, an effective theoretical approach to the modeling of an elastic wave field interaction with an interphase defect, and to defect visualization using dynamic speckle patterns, is also included in this book. The experimental proof of the proposed approaches was achieved using a specially created hybrid optical-digital system for detection of different subsurface defects. This book is intended for engineers, researchers and students engaged in the field of nondestructive evaluation of materials and technical diagnostics of structural elements, hybrid optical systems, speckle metrology and optoacoustic imaging techniques.
Download or read book Application of Phase Retrieval to the Measurement of Optical Surfaces and Wavefronts written by Gregory R. Brady and published by . This book was released on 2008 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical Metrology written by Olivério D.D. Soares and published by Springer. This book was released on 1987-06-30 with total page 824 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Study Institute held in Viana do Castelo, Portugal, July 16-27, 1984
Download or read book Optical Metrology written by Kjell J. G?svik and published by . This book was released on 1987-05-06 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covers the four optical metrology techniques of holographic interferometry, moire techniques, speckle methods and photoelasticity in a single volume.
Download or read book Optical Metrology written by Ghanim A. Al-Jumaily and published by SPIE-International Society for Optical Engineering. This book was released on 1999 with total page 286 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 Three dimensional Imaging Optical Metrology and Inspection IV written by Kevin G. Harding and published by SPIE-International Society for Optical Engineering. This book was released on 1998 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Topics in this volume include: structured light methods; rangefinding methods; and micromeasurements.
Download or read book Adaptive Optics for EUV Lithography written by Alessandro Polo and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical Metrology written by Kjell J. Gasvik and published by . This book was released on with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: New material on computerized optical processes, computerized ray tracing, and the fast Fourier transform, Bibre-Bragg sensors, and temporal phase unwrapping. * New introductory sections to all chapters. * Detailed discussion on lasers and laser principles, including an introduction to radiometry and photometry. * Thorough coverage of the CCD camera. * End-of-chapter problems. Solutions available at http://www.wiley.co.uk/opticalmetrology
Download or read book Optical Metrology written by Oliverio D D Soares and published by . This book was released on 1987-06-30 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Introduction to Optical Metrology written by R. S. Sirohi and published by . This book was released on 2016 with total page 423 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical Metrology and Inspection for Industrial Applications written by Society of Photo-Optical Instrumentation Engineers and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II written by Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
