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Proceedings Paper

Spectra of multiple scattering radiation passed through layer of different optical thickness
Author(s): N. A. Voyshvillo; M. M. Seredenko
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Paper Abstract

An spectrum of a scattering radiation differs from that of radiation falling on a medium. In the case of the single scattering the radiation spectrum is defmed completly with regularities of elementary volume light scattering. In the case of multiple scattering the optical thickness of the scattering medium layer essentially influence on radiation spectrum. On the one hand, light scattering characteristics of layer depend on changes of elementary volume absorption a and scattering a indexes connected with wavelength changes, particulary due to the changes of indicartix of diffusion and refractive index dispersion. On the other hand, the light scattering characteristics of layer depend on the number of scattering actes, that, in turn, depends particulary on the geometrical thickness of the layer. For describing a sick absorption substances with /9 =a/a << 1 and with any indicatrix of diffusion the Rosenberg's arbitrary scattering approximate theory gives good results. Using this theory niultiple scattering radiation spectra for visible region were calculated for the radiation passed through layers of different optical thickness — from small one to thicknesses suitable to the establishment of the depth asymptotic regime. The researches were made for model media in the visible region of the spectrum. The influence of all parameters of elementary volume on the spectrum of passed radiation has been searched. As a result it has been received that in cases of small optical thicknesses (when the single scattering is realized) short-vawe radiation prevalences in scattering light, and in cases of large optical thicknesses — longwave one. Variations of A lead to changes of indicatrix of diffusion of elementary volume. For example, with increasing of A the isotropic indicatrix becames the anisotropic one. The radiation spectra passed through scattering medium into different directions change by different manners. As the depth regime is realized, the spectrum of the passed radiation optical density is formed only with the spectral characteristics of the elementary volume and does not depend on its indicatrix of diffusion and the geometrical thickness of the layer. The results of the calculations are adjusted with the experiments made on the light scattering optical glasses

Paper Details

Date Published: 31 October 1994
PDF: 1 pages
Proc. SPIE 1991, Diffractometry and Scatterometry, (31 October 1994); doi: 10.1117/12.192040
Show Author Affiliations
N. A. Voyshvillo, S.I. Vavilov State Optical Institute (Russia)
M. M. Seredenko, S.I. Vavilov State Optical Institute (Russia)

Published in SPIE Proceedings Vol. 1991:
Diffractometry and Scatterometry
Maksymilian Pluta; Mariusz Szyjer, Editor(s)

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