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Laser Beam Attenuation In The Lower Atmosphere
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Book Synopsis LASER BEAM ATTENUATION IN THE LOWER ATMOSPHERE. by :
Download or read book LASER BEAM ATTENUATION IN THE LOWER ATMOSPHERE. written by and published by . This book was released on 1963 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Small angle spreading, aerosol scattering and molecular absorption are considered the important mechanisms for the weakening of a laser beam in the open atmosphere. Three different transmission laws are worked out for these three mechanisms. Both the physical principles and the numerical values encountered in the lower atmosphere are discussed and illustrated. Random density fluctuations in the turbulent atmosphere are discussed as the cause of small angular deflections in a narrow pencil of light. Beam attenuation due to atmospheric aerosol scattering is treated for an aerosol size distribution described by the sum of two inverse powers of the droplet radius. Laser beams can help find the parameters of such distributions. Molecular absorption is examined in terms of the narrow infrared lines of water vapour. An effort is made to present this difficult topic in as simple and useful a form as is compatible with the observational material. The formulae are designed to make it possible to estimate in detail how the atmosphere would weaken a laser beam under a wide variety of conditions. It is found that some effects are serious even at short ranges of a few meters, while in favourable circumstances, laser signals would not be drastically attenuated out to any practical distance in the lower atmosphere.
Book Synopsis Laser Beam Propagation in the Atmosphere by : Hugo Weichel
Download or read book Laser Beam Propagation in the Atmosphere written by Hugo Weichel and published by SPIE Press. This book was released on 1990 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laser Beams in the Atmosphere by : Vladimir Evseevich Zuev
Download or read book Laser Beams in the Atmosphere written by Vladimir Evseevich Zuev and published by . This book was released on 1982 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Atmospheric Attenuation of Laser Radiation from 0.76 to 31.25 Micrometers by : R. A. McClatchey
Download or read book Atmospheric Attenuation of Laser Radiation from 0.76 to 31.25 Micrometers written by R. A. McClatchey and published by . This book was released on 1974 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: High resolution atmospheric transmittance curves are presented for the spectral region 320 to 13,200/cm (0.7576 to 31.25 micrometers). These spectra are useful as a guide for selecting laser wavelengths for atmospheric propagation studies in this spectral region. In addition, this report provides attenuation coefficients for those lines of the CO, HF, DF, and CO2 laser systems which suffer the least atmospheric attenuation. A new aerosol model is introduced here, taking into account recent measurements of the complex index of refraction of aerosol particles. (Author).
Book Synopsis Atmospheric Attenuation of HF and DF Laser Radiation by : Robert A. McClatchey
Download or read book Atmospheric Attenuation of HF and DF Laser Radiation written by Robert A. McClatchey and published by . This book was released on 1972 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the development of HF and DF lasers having emission lines in the range from 2800 to 3700/cm−1 (HF) and 2000 to 2750/cm−1 (DF), it is of importance to establish which of the more than 100 lines can be transmitted through a variety of atmospheric paths. The spectral region of HF emission spans a very important water vapor absorption band and, in addition, there is strong absorption by CO2 and weaker absorption by ozone and methane. The spectral region of DF emission covers the very strong 4.3 micrometer CO2 absorption band and weaker absorption by N2O and HDO at higher frequencies (low DF vibrational transitions). There is some weak ozone absorption also in the region of DF emission. Absorption lines associated with all of these molecules were included in the calculation of synthetic spectra covering the region of HF and DF emission. After limiting the number of emission lines to be considered in detail according to a criterion based on atmospheric attenuation, a series of tables was constructed providing quantitative attenuation information for each of 97 laser lines and for 10 different atmospheric models. Data based on two different aerosol scattering models are included in these tables.
Book Synopsis Atmospheric Attenuation of CO Laser Radiation by : R. A. McClatchey
Download or read book Atmospheric Attenuation of CO Laser Radiation written by R. A. McClatchey and published by . This book was released on 1971 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the development of the CO laser having emission lines in the range from 1200/cm to greater than 2000/cm, it is of importance to establish which of the more than 200 lines can be transmitted through a variety of atmospheric paths. The spectral region of CO emission spans a very important water vapor absorption band and, in addition, there is absorption by CO2, O3, N2O and CH4. Absorption lines associated with all of these molecules were included in the calculation of synthetic spectra covering the region of CO emission. After limiting the number of CO emission lines to be considered in detail according to a criterion based on atmospheric attenuation, a series of tables was constructed providing quantitative attenuation information for each of 88 laser lines and for 10 different atmospheric models. Data based on two different aerosol scattering models are included in these tables. (Author).
Book Synopsis Laser Beam Propagation in the Atmosphere by : J. W. Strohbehn
Download or read book Laser Beam Propagation in the Atmosphere written by J. W. Strohbehn and published by Springer. This book was released on 2014-03-12 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: With contributions by numerous experts
Book Synopsis Atmospheric Attenuation of HeNe Laser Radiation by : Graham G. Williford
Download or read book Atmospheric Attenuation of HeNe Laser Radiation written by Graham G. Williford and published by . This book was released on 1977 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atmospheric attenuation of a low-powered HeNe laser beam was examined both theoretically and experimentally. Experimental results were limited, but useful information could be extracted from the data. Close agreement was found between experimental results and theoretical predictions based on interpolation between aerosol coefficients given by McClatchey and Selby. The effects of atmospheric turbulence upon laser propagation were also examined. An attempt was made to minimize the effect turbulence had upon test results, so that atmospheric attenuation could be studied independently. The conclusion of a theoretical study was that this could be accomplished by using a receiver several times larger than the beam size at the target. The prediction proved true during test runs. The experimentation was conducted over a 1.23 kilometer course, using a 2 milliwatt HeNe laser as the transmitter, and a 12 inch spherical mirror as the receiver. Tests were conducted under visibility conditions ranging from 2 kilometers to 18 kilometers. (Author).
Book Synopsis Atmospheric Attenuation of Laser Radiation from 0.76 to 31.25 Micrometers by : R. A. McClatchey
Download or read book Atmospheric Attenuation of Laser Radiation from 0.76 to 31.25 Micrometers written by R. A. McClatchey and published by . This book was released on 1974 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: High resolution atmospheric transmittance curves are presented for the spectral region 320 to 13,200/cm (0.7576 to 31.25 micrometers). These spectra are useful as a guide for selecting laser wavelengths for atmospheric propagation studies in this spectral region. In addition, this report provides attenuation coefficients for those lines of the CO, HF, DF, and CO2 laser systems which suffer the least atmospheric attenuation. A new aerosol model is introduced here, taking into account recent measurements of the complex index of refraction of aerosol particles. (Author)
Book Synopsis Free-Space Laser Communications by : Arun K. Majumdar
Download or read book Free-Space Laser Communications written by Arun K. Majumdar and published by Springer Science & Business Media. This book was released on 2010-05-05 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Potential Capabilities of Four Lower Atmosphere Remote Sensing Techniques by : Wave Propagation Laboratory
Download or read book Potential Capabilities of Four Lower Atmosphere Remote Sensing Techniques written by Wave Propagation Laboratory and published by . This book was released on 1971 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is a discussion and evaluation of the present and potential capabilities of four remote sensing techniques for the measurement of meteorological variables in the lower atmosphere (i.e., primarily the troposphere). The four techniques treated are acoustic echo sounding, FM-CW radar, Lidar, and microwave radiometry. The meteorological variables of interest are the profiles (in three dimensions) of wind velocity, temperature, humidity, density, and refractive index. The desired capability is not merely to sense, but also to measure quantitatively the variable being studied.
Book Synopsis Laser Monitoring of the Atmosphere by : Everett D. Hinkley
Download or read book Laser Monitoring of the Atmosphere written by Everett D. Hinkley and published by Springer. This book was released on 1976 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis U.S. Government Research Reports by :
Download or read book U.S. Government Research Reports written by and published by . This book was released on 1964 with total page 1118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Atmospheric Effects on Low-Power Laser Beam Propagation by : T. W. Tuer
Download or read book Atmospheric Effects on Low-Power Laser Beam Propagation written by T. W. Tuer and published by . This book was released on 1980 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt: A detailed discussion is presented of various theories, experiments, and models pertinent to atmospheric effects on the transmission of low-power laser radiation. The effects of molecules, aerosols, and turbulence and their levels in the atmosphere are considered. Specific conclusions and recommendations are given with regard to the state of knowledge in this field, and to models that can be used to predict atmospheric effects that are relevant to comprehensive personnel safety standards.
Book Synopsis Atmospheric Transmittance, 7-30 Micrometers by : R. A. McClatchey
Download or read book Atmospheric Transmittance, 7-30 Micrometers written by R. A. McClatchey and published by . This book was released on 1972 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: High resolution transmittance curves are presented for the spectral region 320-1400 wave numbers. These spectra are useful as a guide for selecting laser wavelengths for atmospheric propagation studies in this spectral region. In addition, this report provides specific information concerning the attenuation coefficients of 41 CO2 rotational laser lines in the 10.4 micrometer band system (v3 to v1). Charts for predicting the atmospheric attenuation of the CO2 laser lines are provided for each of five climatological model atmospheres and two haze models. The current report extends the work presented in two earlier reports on (1) CO laser attenuation in the 1400-2120/cm−1 (4.72-7. 14 micrometers) region: AFCRL-71-0370 and (2) HF and DF laser attenuation in the 2120-3740/cm (2.67-4.72 micrometers) region: AFCRL-72-0312. This report, when combined with the two previous reports described above, provides synthetic spectra for the entire region from 2.67-31.25 micrometers.
Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Springer Handbook of Lasers and Optics by : Frank Träger
Download or read book Springer Handbook of Lasers and Optics written by Frank Träger and published by Springer Science & Business Media. This book was released on 2012-05-05 with total page 1704 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition features numerous updates and additions. Especially 4 new chapters on Fiber Optics, Integrated Optics, Frequency Combs and Interferometry reflect the changes since the first edition. In addition, major complete updates for the chapters: Optical Materials and Their Properties, Optical Detectors, Nanooptics, and Optics far Beyond the Diffraction Limit. Features Contains over 1000 two-color illustrations. Includes over 120 comprehensive tables with properties of optical materials and light sources. Emphasizes physical concepts over extensive mathematical derivations. Chapters with summaries, detailed index Delivers a wealth of up-to-date references.
