Small-angle approximation to the transfer of narrow laser beams in anisotropic scattering media / Michael A. Box and Adarsh Deepak ; prepared for Marshall Space Flight Center under contract NAS8-33135.
The broadening and the signal power detected of a laser beam traversing an anisotropic scattering medium were examined using the small-angle approximation to the radiative transfer equation in which photons suffering large-angle deflections are neglected. To obtain tractable answers, simple Gaussia...
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| Corporate Authors: | , , |
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| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington, D.C. : [Springfield, Va.] :
National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [For sale by the National Technical Information Service],
1981.
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| Series: | NASA contractor report ;
NASA CR-3407. |
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| Summary: | The broadening and the signal power detected of a laser beam traversing an anisotropic scattering medium were examined using the small-angle approximation to the radiative transfer equation in which photons suffering large-angle deflections are neglected. To obtain tractable answers, simple Gaussian and non-Gaussian functions for the scattering phase functions are assumed. Two other approximate approaches employed in the field to further simplify the small-angle approximation solutions are described, and the results obtained by one of them are compared with those obtained using small-angle approximation. An exact method for obtaining the contribution of each higher order scattering to the radiance field is examined but no results are presented. NASA thesaurus headings: Anisotropic media - Approximation - Atmospheric scattering - Lasing - Radiative transfer - Transmittance - Atmospheric optics - Clouds - Fog - Fourier transformation - Functions (Mathematics) - Photons - Radiance - Smoke. |
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| Item Description: | "April 1981"--Cover. Subject Category 74. |
| Physical Description: | vi, 40 pages : illustrations ; 27 cm. Distributed to depository libraries in microfiche; also available via the Internet. |
| Bibliography: | Includes bibliographical references. |