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Backscattering and polarization ratio for cylindrical graphite fibers at CO2 laser wavelengths

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Abstract

Measurements are presented of backscattering from an artificial cloud composed of cylindrical graphite fibers at a distance of 730 m with a CO2 lidar system at 20 wavelengths and two incident polarizations (horizontal and vertical). The backscatter measurements and the polarization ratio are in good agreement with single-scattering calculations for an infinitely long cylinder at normal incidence. The measurements give experimental evidence of the predominant orientation of graphite fibers with their long axes in a random position in the xy plane (i.e., parallel to the ground).

© 1993 Optical Society of America

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