Computer Science
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992kfnt....8....3d&link_type=abstract
Kinematika i Fizika Nebesnykh Tel (ISSN 0233-7665), vol. 8, no. 2, Mar.-Apr. 1992, p. 3-14. In Russian.
Computer Science
1
Asteroids, Circular Polarization, Light Scattering, Planetary Surfaces, Surface Properties, Celestial Bodies, Graphite, Metal Compounds, Regolith
Scientific paper
A high-precision laboratory Stokes polarimeter was used to obtain the phase dependences of the circular polarization of light scattered by surfaces formed by a layer of fine particles. The particles used (nickel, iron, and graphite) were similar in size but differed in shape; all the particles were highly absorbent. It is found that strongly absorbent materials are characterized by substantial (greater than 1 percent) circular polarization, particularly for large phase angles. It is also found that the phase variability of circular polarization depends strongly on the structural characteristics of the surface. A model is developed which makes it possible to calculate the integral Stokes vector of light scattered by a rough surface and which can be used for interpreting the phase dependences of circular polarization for absorbent materials. The theoretically determined phase dependences of circular polarization for iron, nickel, and graphite are found to be in good agreement with the observed dependences. It is concluded that measurements of the circular polarization of light scattered by the surfaces of atmosphereless celestial bodies, such as asteroids, can be used to detect metals in the surface layer and to determine the presence of regolith on the surface of metal-containing objects.
Degtiarev V. S.
Kolokolova L. O.
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