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Diffraction Limited Imaging With Large And Moderate Telescopes
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Book Synopsis Diffraction-limited Imaging with Large and Moderate Telescopes by : Swapan K. Saha
Download or read book Diffraction-limited Imaging with Large and Moderate Telescopes written by Swapan K. Saha and published by World Scientific. This book was released on 2007 with total page 633 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the fundamentals of wave optics, polarization, interference, diffraction, imaging, and the origin, properties, and optical effects of turbulence in the Earth's atmosphere. Techniques developed during the last few decades to overcome atmospheric image degradation (including passive methods, speckle interferometry in particular, and active methods such as adaptive optics), are highlighted. Also discussed are high resolution sensors, image processing, and the astronomical results obtained with these techniques.
Book Synopsis Diffraction-Limited Imaging with Large and Moderate Telescopes by :
Download or read book Diffraction-Limited Imaging with Large and Moderate Telescopes written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aperture Synthesis by : Swapan Kumar Saha
Download or read book Aperture Synthesis written by Swapan Kumar Saha and published by Springer Science & Business Media. This book was released on 2010-10-17 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the fundamentals of stellar interferometry with emphasis on aperture synthesis using sparse array of telescopes particularly at optical/IR wavelengths, the origin, properties, and optical effects of turbulence in the Earth's atmosphere, techniques developed to overcome image degradation. Studded with more than one hundred and fifty illustrations and tens of footnotes, it addresses the basic tricks of trade, current trend, motivation, methods, and path to future promise of true interferometry both from the ground and space. Also discussed are the technical challenge involved, such as beam transportation and recombination, detecting fringes using modern sensors, and image synthesis. Astronomical science that benefits from aperture synthesis imaging are highlighted as well.
Book Synopsis Adaptive Optics for Astronomical Telescopes by : John W. Hardy
Download or read book Adaptive Optics for Astronomical Telescopes written by John W. Hardy and published by Oxford Optical and Imaging Sci. This book was released on 1998 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book by one of the leaders in adaptive optics covers the fundamental theory and then describes in detail how this technology can be applied to large ground-based telescopes to compensate for the effects of atmospheric turbulence. It includes information on basic adaptive optics components and technology, and has chapters devoted to atmospheric turbulence, optical image structure, laser beacons, and overall system design. The chapter on system design is particularly detailed and includes performance estimation and optimization. Combining a clear discussion of physical principles with numerous real-world examples, this book will be a valuable resource for all graduate students and researchers in astronomy and optics.
Author :Virendra N. Mahajan Publisher :SPIE-International Society for Optical Engineering ISBN 13 :9780819486998 Total Pages :0 pages Book Rating :4.4/5 (869 download)
Book Synopsis Optical Imaging and Aberrations by : Virendra N. Mahajan
Download or read book Optical Imaging and Aberrations written by Virendra N. Mahajan and published by SPIE-International Society for Optical Engineering. This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ten years have passed since the publication of the first edition of this classic text in April 2001. Considerable new material amounting to 100 pages has been added in this second edition. Each chapter now contains a Summary section at the end. The new material in Chapter 4 consists of a detailed comparison of Gaussian apodization with a corresponding beam, determination of the optimum value of the Gaussian radius relative to that of the pupil to yield maximum focal-point irradiance, detailed discussion of standard deviation, aberration balancing, and Strehl ratio for primary aberrations, derivation of the aberration-free and defocused OTF, discussion of an aberrated beam yielding higher axial irradiance in a certain defocused region than its aberration-free focal-point value, illustration that aberrated PSFs lose the advantage of Gaussian apodizaton in reducing the secondary maxima of a PSF, and a brief description of the characterization of the width of a multimode beam. In Chapter 5, the effect of random longitudinal defocus on a PSF is included. The coherence length of atmospheric turbulence is calculated for looking both up and down through the atmosphere. Also discussed are the angle of arrival of a light wave propagating through turbulence, and lucky imaging where better-quality short-exposure images are selected, aligned, and added to obtain a high-quality image.
Book Synopsis Aperture Synthesis by : Swapan Kumar Saha
Download or read book Aperture Synthesis written by Swapan Kumar Saha and published by Springer. This book was released on 2010-11-04 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the fundamentals of stellar interferometry with emphasis on aperture synthesis using sparse array of telescopes particularly at optical/IR wavelengths, the origin, properties, and optical effects of turbulence in the Earth's atmosphere, techniques developed to overcome image degradation. Studded with more than one hundred and fifty illustrations and tens of footnotes, it addresses the basic tricks of trade, current trend, motivation, methods, and path to future promise of true interferometry both from the ground and space. Also discussed are the technical challenge involved, such as beam transportation and recombination, detecting fringes using modern sensors, and image synthesis. Astronomical science that benefits from aperture synthesis imaging are highlighted as well.
Book Synopsis Adaptive Optics for Large Telescopes by :
Download or read book Adaptive Optics for Large Telescopes written by and published by . This book was released on 1992 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laser Guide Star Adaptive Optics for Astronomy by : N. Ageorges
Download or read book Laser Guide Star Adaptive Optics for Astronomy written by N. Ageorges and published by Springer. This book was released on 2000-05-31 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adaptive optics allows the theoretical limit of angular resolution to be achieved from a large telescope, despite the presence of turbulence. Thus an eight meter class telescope, such as one of the four in the Very Large Telescope operated by ESO in Chile, will in future be routinely capable of an angular resolution of almost 0.01 arcsec, compared tot he present resolution of about 0.5 arcsec for conventional imaging in good condition. All the world's major telescopes either have adaptive optics or are in the process of building AO systems. It turns out that a reasonable fraction of the sky can be observed using adaptive optics, with moderately good imaging quality, provided imaging in done in the near IR. To move out of the near IR, with its relatively poor angular resolution, astronomers need a laser guide star. There is a layer of Na atoms at approximately 90 km altitude that can be excited by a laser to produce such a source, or Rayleigh scattering can be employed lower in the atmosphere. But the production and use of laser guide stars is not trivial, and the key issues determining their successful implementation are discussed here, including the physics of the Na atom, the cone effect, tilt determination, sky coverage, and numerous potential astronomical applications.
Book Synopsis Amplitude and Intensity Spatial Interferometry II by :
Download or read book Amplitude and Intensity Spatial Interferometry II written by and published by . This book was released on 1994 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Working Papers by : National Research Council
Download or read book Working Papers written by National Research Council and published by National Academies Press. This book was released on 1991-02-01 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains working papers on astronomy and astrophysics prepared by 15 non-National Research Council panels in areas ranging from radio astronomy to the status of the profession.
Book Synopsis Astronomical Optics by : Daniel J. Schroeder
Download or read book Astronomical Optics written by Daniel J. Schroeder and published by Elsevier. This book was released on 2012-12-02 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by a recognized expert in the field, this clearly presented, well-illustrated book provides both advanced level students and professionals with an authoritative, thorough presentation of the characteristics, including advantages and limitations, of telescopes and spectrographic instruments used by astronomers of today. Written by a recognized expert in the field Provides both advanced level students and professionals with an authoritative, thorough presentation of the characteristics, including advantages and limitations, of telescopes and spectrographic instruments used by astronomers of today
Book Synopsis Instrumentation for Optical Remote Sensing from Space by : John S. Seeley
Download or read book Instrumentation for Optical Remote Sensing from Space written by John S. Seeley and published by . This book was released on 1986 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Adaptive Optical Systems and Applications by : Robert K. Tyson
Download or read book Adaptive Optical Systems and Applications written by Robert K. Tyson and published by . This book was released on 1995 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Adaptive Optics by : Michael S. Tarov
Download or read book Adaptive Optics written by Michael S. Tarov and published by Nova Publishers. This book was released on 2002 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adaptive optics is a field which is coming into its own with new discoveries occurring almost daily both in astronomy and in applications of AO in applied fields. In an adaptive optics system, the output from a wavefront sensor is used to calculate corrections that actively remove distortions from an image. The applications of adaptive optics in vision science have received considerable impetus from the knowledge developed by astronomers about how to correct images using AO technology. It is expected that developments in adaptive optics will radically change the face of astronomy in the 21st century. These systems will largely overcome the main limitation of ground-based telescopes, namely the severe reduction in image quality caused by turbulence in the Earth's atmosphere. Intended for use at near infrared wavelengths, adaptive optics allow imaging and spectroscopy at the limit of resolution imposed by optical diffraction an advance in astronomer's ability to view the heavens unparalleled since the invention of the telescope. AO is now also entering clinical medicine in the field of ophthalmology and other related fields. This new book presents several hundred current abstracts in the field, each fully indexed, for ease of access and contains a CD ROM for further research.
Book Synopsis The Present and Future of the Telescope of Moderate Size by : Frank Bradshaw Wood
Download or read book The Present and Future of the Telescope of Moderate Size written by Frank Bradshaw Wood and published by University of Pennsylvania Press. This book was released on 2016-11-11 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering the astronomical work achieved with telescopes of moderate size, this volume indicates how recent developments in electronics make it possible for these telescopes to cope with problems formerly attacked only by the largest instruments. Because the future accomplishments of the telescopes of moderate size should be tremendously increased, this book considers both what is being accomplished and what scientists may confidently expect to be able to do in the predictable future. In searching for an appropriate topic for the symposium, the astronomers who have contributed to this volume recognized that although much attention has been devoted in recent years to Schmidt type telescopes, radio telescopes, and very large instruments, a great deal of the useful work has been and is being carried out by conventional telescopes of moderate size. Especially in the fields of astrometry and photometry a rather large fraction of the observations are being made with telescopes within, roughly, an aperture range of twelve to forty inches. Although perhaps the most exciting or novel results will be obtained with the giant reflectors, much of our progress depends upon the unspectacular accumulation and discussion of data and, within the limits of stellar magnitude to which they are suited, the smaller instruments can contribute substantially, meriting the definitive research provided in the pages of this book. Outstanding scientists have contributed to this volume their findings in such matters as image tube development; photoelectric problems in astronomy; investigation of image detectors (sensitivity assessment, equivalent quantum efficiencies, etc.); modern computing machines capable of solving photometric problems; the Newton Lacy Pierce Photometer; the infrared technique for stellar photometry; application of the small telescope to photoelectric problems; photoelectric studies of scintillation of starlight; the upper atmosphere as discerned from studies of stellar scintillation; variable star problems, present and future; and stellar spectroscopy with the mode rate size telescope. The result is a book of vital importance to the student of astronomy who wishes to understand the advances in his field made possible by electronic progress.
Book Synopsis General Theory of Light Propagation and Imaging Through the Atmosphere by : T. Stewart McKechnie
Download or read book General Theory of Light Propagation and Imaging Through the Atmosphere written by T. Stewart McKechnie and published by Springer. This book was released on 2015-08-05 with total page 639 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book lays out a new, general theory of light propagation and imaging through Earth’s turbulent atmosphere. Current theory is based on the – now widely doubted – assumption of Kolmogorov turbulence. The new theory is based on a generalized atmosphere, the turbulence characteristics of which can be established, as needed, from readily measurable properties of point-object, or star, images. The pessimistic resolution predictions of Kolmogorov theory led to lax optical tolerance prescriptions for large ground-based astronomical telescopes which were widely adhered to in the 1970s and 1980s. Around 1990, however, it became clear that much better resolution was actually possible, and Kolmogorov tolerance prescriptions were promptly abandoned. Most large telescopes built before 1990 have had their optics upgraded (e.g., the UKIRT instrument) and now achieve, without adaptive optics (AO), almost an order of magnitude better resolution than before. As well as providing a more comprehensive and precise understanding of imaging through the atmosphere with large telescopes (both with and without AO), the new general theory also finds applications in the areas of laser communications and high-energy laser beam propagation.
Author :Eli Atad-Ettedgui Publisher :SPIE-International Society for Optical Engineering ISBN 13 : Total Pages :630 pages Book Rating :4.3/5 (91 download)
Book Synopsis Optical Fabrication, Metrology, and Material Advancements for Telescopes by : Eli Atad-Ettedgui
Download or read book Optical Fabrication, Metrology, and Material Advancements for Telescopes written by Eli Atad-Ettedgui and published by SPIE-International Society for Optical Engineering. This book was released on 2004 with total page 630 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.
