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Author : Edmond M. Dewan
Publisher : Unknown
Page : 56 pages
File Size : 50,7 Mb
Release : 1993
Category : Atmospheric turbulence
ISBN : IND:30000097835676
Author : Anonim
Publisher : Unknown
Page : 0 pages
File Size : 55,7 Mb
Release : 1993
Category : Atmospheric turbulence
ISBN : OCLC:156765933
Author : Hemani Kaushal,V.K. Jain,Subrat Kar
Publisher : Springer
Page : 209 pages
File Size : 46,5 Mb
Release : 2017-01-06
Category : Technology & Engineering
ISBN : 9788132236917
This book provides an in-depth understanding of free space optical (FSO) communication with a particular emphasis on optical beam propagation through atmospheric turbulence. The book is structured in such a way that it provides a basic framework for the beginners and also gives a concise description from a designer’s perspective. The book provides an exposure to FSO technology, fundamental limitations, design methodologies, system trade-offs, acquisition, tracking and pointing (ATP) techniques and link-feasibility analysis. The contents of this book will be of interest to professionals and researchers alike. The book may also be used as a textbook for engineering coursework and professional training.
Author : Elena Masciadri,Marc Sarazin
Publisher : World Scientific
Page : 415 pages
File Size : 53,5 Mb
Release : 2009
Category : Science
ISBN : 9781848164857
This book collects most of the talks and poster presentations presented at the "Optical Turbulence ? Astronomy meets Meteorology" international conference held on 15?18 September, 2008 at Nymphes Bay, Alghero, Sardinia, Italy. The meeting aimed to deal with one of the major causes of wavefront perturbations limiting the astronomical high-angular-resolution observations from the ground. The uniqueness of this meeting has been the effort to attack this topic in a synergic and multidisciplinary approach promoting constructive discussions between the actors of this science ? the astronomers, meteorologists, physicists of the atmosphere and the experts in adaptive optics and interferometry techniques whose main goal is to correct, in real-time, the wavefront perturbations induced by atmospheric turbulence to restore at the telescope foci the best available image quality.
Author : Elena Masciadri,Marc Sarazin
Publisher : World Scientific
Page : 416 pages
File Size : 44,9 Mb
Release : 2009-09-14
Category : Science
ISBN : 9781908978172
This book collects most of the talks and poster presentations presented at the "Optical Turbulence — Astronomy meets Meteorology" international conference held on 15–18 September, 2008 at Nymphes Bay, Alghero, Sardinia, Italy. The meeting aimed to deal with one of the major causes of wavefront perturbations limiting the astronomical high-angular-resolution observations from the ground. The uniqueness of this meeting has been the effort to attack this topic in a synergic and multidisciplinary approach promoting constructive discussions between the actors of this science — the astronomers, meteorologists, physicists of the atmosphere and the experts in adaptive optics and interferometry techniques whose main goal is to correct, in real-time, the wavefront perturbations induced by atmospheric turbulence to restore at the telescope foci the best available image quality. Contents: Optical Turbulence in High Angular Resolution Techniques in Astronomy (J M Beckers)Optical Turbulence Profiles at CTIO from a 12-Element Lunar Scintillometer (P Hickson et al.)High Resolution SLODAR Measurements on Mauna Kea (T Butterley et al.)How We Can Understand the Antarctic Atmospheric? (J W V Storey et al.)The Paranal Surface Layar (J Melnick et al.)Introduction to Data Assimilation in Meteorology (P Brousseau … L Auger)The Mauna Kea Weather Center: A Case for Custom Seeing Forecasts (T Cherubini et al.)Dealing with Turbulence: MCAO Experience and Beyond (R Ragazzoni et al.)Future-Look Science Operations for the LBT (R F Green)Surface Layer SLODAR (J Osborn et al.)and other papers Readership: Advanced undergraduates and graduate students, and physicists working in the field of astronomy. Keywords:Astronomy;Optical Turbulence;Atmospheric Models;GCM and Mesoscale Models;Monte Marlo Models
Author : Edmond M. Dewan
Publisher : Unknown
Page : 76 pages
File Size : 45,5 Mb
Release : 1980
Category : Atmospheric turbulence
ISBN : UOM:39015095331412
This report is a tutorial on the effects of atmospheric turbulence upon systems which rely upon the propagation of LASER beams. In addition to providing a simplified presentation of turbulence theory and optical effects, it describes the state of the art of the new technique of radiosonde estimation of index of refraction fluctuations. Suggestions are given for future research which will help to answer current Air Force needs. The feasibility of some laser systems will depend upon the value of r0, the coherence length (which is related to “C2n” which in turn is related to the degree of turbulence). At present, the statistics of “r0” are inadequate.
Author : Pierre Bely
Publisher : Springer Science & Business Media
Page : 527 pages
File Size : 51,7 Mb
Release : 2006-05-26
Category : Science
ISBN : 9780387226064
There is no dearth of books on telescope optics and, indeed, optics is clearly a keyelementinthedesignandconstructionoftelescopes.Butitisbynomeans the only important element. As telescopes become larger and more costly, other aspects such as structures, pointing, wavefront control, enclosures, and project management become just as critical. Although most of the technical knowledge required for all these ?elds is available in various specialized books, journal articles, and technical reports, they are not necessarily written with application to telescopes in mind. This bookisa?rstattemptatassemblinginasingletextthebasicastronomicaland engineering principles used in the design and construction of large telescopes. Itsaimistobroadlycoverallmajoraspectsofthe?eld,fromthefundamentals ofastronomicalobservationto optics, controlsystems,structural,mechanical, andthermalengineering,aswellasspecializedtopicssuchassiteselectionand program management. This subject is so vast that an in-depth treatment is obviously imprac- cal. Our intent is therefore only to provide a comprehensive introduction to the essential aspects of telescope design and construction. This book will not replace specialized scienti?c and technical texts. But we hope that it will be useful for astronomers, managers, and systems engineers who seek a basic understanding of the underlying principles of telescope making, and for s- cialists who wish to acquaint themselves with the fundamental requirements and approaches of their colleagues in other disciplines.
Author : James H. Brown
Publisher : Unknown
Page : 62 pages
File Size : 51,7 Mb
Release : 1984
Category : Atmospheric turbulence
ISBN : UOM:39015095140441
Five different instruments were used in coordinated multiple experiments to measure atmospheric turbulence. C sub n squared, the optical refractive structure constant, was measured by thermosondes, UHF radar, stellar scintillometer, and aircraft mounted micro-thermal probes. Presented here are the results of 19 rawinsode flights. Also comparisons of eight thermosonde/radar profiles, one radar, scintillometer, thermosonode profile, and several aircraft profiles are presented. For the scales discussed here, good agreement is shown between radar, thermosonode, and scintillometer data. Worse agreement is obtained from aircraft measurements. A diurnal shift in the C2 profile is noted but no tropopause enhancement is found.
Author : James H. Brown
Publisher : Unknown
Page : 44 pages
File Size : 52,9 Mb
Release : 1984
Category : Atmosphere, Upper
ISBN : UOM:39015095140458
Eight AFGL thermosondes were flown from Mt. Haleakala, Hawaii to measure atmospheric turbulence in the form of the optical refractive index structure constant C sub n squared. Temperature and relative humidity comparisons between the AFGL instruments and standard GMD rawinsondes are presented. The AFGL instruments obtain greater temperature and humidity spatial resolution and consequently show finer structure in the profiles. A diurnal shift in the C sub n squared profile is noted as well as a tropopause enhancement. Coherence scales are calculated from the thermosonde data.
Author : Anonim
Publisher : Unknown
Page : 1642 pages
File Size : 53,6 Mb
Release : 1992
Category : Science
ISBN : MINN:31951P002973399
Author : Arun K. Majumdar,Jennifer C Ricklin
Publisher : Springer Science & Business Media
Page : 429 pages
File Size : 45,8 Mb
Release : 2010-05-05
Category : Science
ISBN : 9780387286778
This is a comprehensive tutorial on the emerging technology of free-space laser communications (FSLC). The book offers an all-inclusive source of information on the basics of FSLC, and a review of state-of-the-art technologies. Coverage includes atmospheric effects for laser propagation and FSLC systems performance and design. Free-Space Laser Communications is a valuable resource for engineers, scientists and students interested in laser communication systems designed for the atmospheric optical channel.
Author : Indian Institute of Tropical Meteorology
Publisher : Unknown
Page : 110 pages
File Size : 54,5 Mb
Release : 1996
Category : Meteorology
ISBN : CHI:48294444
Author : Olivier Bouchet,Hervé Sizun,Christian Boisrobert,Frédérique de Fornel
Publisher : John Wiley & Sons
Page : 221 pages
File Size : 40,8 Mb
Release : 2010-01-05
Category : Technology & Engineering
ISBN : 9780470394410
Free space optics is a telecommunications technique which is already being used for everyday exchange of information and has many advantages over other techniques (bandwidth, low cost, mobility of the equipment, security, etc.); within the next decade, it is likely to become an integral and essential part of data-processing architectures and telecommunications. A history of wireless optical telecommunications is given, together with a recapitulation of the application of the principles of electromagnetism to free-space optics. Coverage is also given to the transmitters and receivers of optical beams, whih are the basis of any optical communication system. These devices were responsible for the first truly significant advances in the performance of these systems. Special attention is given to the problems associated with the propagation of photons, both in the presence and absence of obstacles, since these are key issues in gaining an understanding of future telecommunication systems based on wireless optics. Finally, the authors considwer standards, as well as safety and confidentiality issues.
Author : Environmental Research Institute of Michigan. Infrared Information and Analysis Center,United States. Office of Naval Research
Publisher : Unknown
Page : 1740 pages
File Size : 54,7 Mb
Release : 1978
Category : Infrared radiation
ISBN : UCR:31210003060389
Author : Larry C. Andrews
Publisher : Society of Photo Optical
Page : 96 pages
File Size : 43,6 Mb
Release : 2004
Category : Technology & Engineering
ISBN : 0819453188
The material in this Field Guide is a condensed version of similar material found in two textbooks: Laser Beam Propagation through Random Media (SPIE Vol. PM53) and Laser Beam Scintillation with Applications (SPIE Vol. PM99). Topics chosen for this concise presentation include a review of classical Kolmogorov turbulence theory, Gaussian-beam waves in free space, and atmospheric effects on a propagating optical wave. These atmospheric effects have great importance in a variety of applications like imaging, free space optical communications, laser radar, and remote sensing. This Guide presents tractable mathematical models from which the practitioner can readily determine beam spreading, beam wander, spatial coherence radius (Fried's parameter), angle of arrival fluctuations, scintillation, aperture averaging effects, fade probabilities, bit error-rates, and enhanced backscatter effects, among others.