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Author: Robert A. McClatchey
Publisher:
ISBN:
Category : Atmospheric models
Languages : en
Pages : 148
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Book Description
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.
Author: Robert A. McClatchey
Publisher:
ISBN:
Category : Atmospheric models
Languages : en
Pages : 148
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Book Description
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.
Author: R. A. McClatchey
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 180
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Book Description
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).
Author: R. A. McClatchey
Publisher:
ISBN:
Category : Absorption spectra
Languages : en
Pages : 124
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Book Description
A series of tables and charts is presented from which the atmospheric transmittance between any two points in the terrestrial atmosphere can be determined. This material is based on a set of five atmospheric models ranging from tropical to arctic and two aerosol models. A selected set of laser frequencies has been defined for which monochromatic transmittance values have been given. For low resolution transmittance predcition, a series of charts has been drawn providing the capability for predicting transmittance at a resolution of 20 wave-numbers. Separate sections are included on scattered solar radiation, infrared emission, refractive effects, and attenuation by cloud and fog. This third edition differs from the others in that the low resolution spectral curves for the uniformly mixed gases and in the short wavelength region for water vapor have been revised, providing some overall improvement in accuracy; and more importantly, an appendix has been added providing model data and equivalent sea level path data for the U.S. Standard Atmosphere, 1962.
Author:
Publisher:
ISBN:
Category : Environmental geology
Languages : en
Pages : 350
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Book Description
Author: George A. Vanasse
Publisher: Elsevier
ISBN: 1483267032
Category : Science
Languages : en
Pages : 347
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Book Description
Spectrometric Techniques, Volume III presents the applications of spectrometric techniques to atmospheric and space studies. This book reviews the spectral data processing and analysis techniques that are of broad applicability. Organized into five chapters, this volume begins with an overview of the instrumentation used for obtaining field data. This text then reviews the contribution that space-borne spectroscopy in the thermal IR has made to the understanding of the planets. Other chapters consider the instruments that have recorded the planetary emission spectra. This book discusses as well the interpretation of planetary IR spectra based on the theory of radiative transfer, which describes the interaction of electromagnetic radiation with matter. The final chapter deals with a few practical remarks on calculation of the inverse-filtered spectrum, wherein the Fourier transform of the data is divided by the Fourier transform of the impulse response function for the low frequencies. This book is a valuable resource for spectroscopists and scientists.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 722
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author:
Publisher:
ISBN:
Category : Lasers
Languages : en
Pages : 634
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Book Description
References and abstracts to international literature (mostly journal articles). Classified arrangement. Subject, author, and source indexes. Ser. 1, 1974: 8256 references.
Author: Air Force Cambridge Research Laboratories (U.S.)
Publisher:
ISBN:
Category : Geophysics
Languages : en
Pages : 384
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Book Description
Author: F. X. Kneizys
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 28
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Book Description
This report describes the linear transmission effects of the atmosphere on laser beams and gives examples of high resolution (FASCODE) model predictions of transmittance for carbon dioxide, deuterium fluoride, Hydrogen fluoride, Neodymium - Yttrium aluminum garnet, Iodine, and Excimer laser wavelengths. Keywords: Atmospheric transmittance; Laser attenuation; Linear propagation; Infrared; Visible; Molecular absorption; Aerosol extinction; Aerosol absorption.
Author: Air Force Cambridge Research Laboratories (U.S.)
Publisher:
ISBN:
Category : Geophysics
Languages : en
Pages : 212
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Book Description
This bibliography lists all AFCRL in-house reports, journal articles, and contractor reports issued during the reporting period. The DD Form 1473 (Document Control Data - R & D) for each publication is included. In Part I, the 1473's for in-house reports are arranged numerically by the series in which they were issued: in Part II, the 1473's for journal articles are arranged alphabetically by author; in Part III, the 1473's for contractor reports are arranged alphabetically by corporate author. For cross-reference purposes, an index is included, listing the publications numerically by the AFCRL document number.
