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Proceedings Paper

Far-Infrared (FIR) Optical Black Bidirectional Reflectance Distribution Function (BRDF)
Author(s): Sheldon M Smith
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Paper Abstract

A nonspecular reflectometer and its operation at far-infrared wavelengths are described. Large differences in nonspecular reflectance were found to exist between different optically black coatings. Normal incidence bidirectional reflectance distribution function (BRDF) measurements at wavelengths between 12 and 316 μm of three black coatings show that their mean BRDFs increase with wavelength. The specularity of two of these coatings also showed a strong wavelength dependence, while the specularity of one coating seemed independent of wavelength. The BRDF of one coating depended on the angle of incidence at 12 and 38 μm, but not at 316 μm. Beyond 200 μm, it was found necessary to correct the measurements for the beam spread of the instrument.

Paper Details

Date Published: 3 March 1981
PDF: 8 pages
Proc. SPIE 0257, Radiation Scattering in Optical Systems, (3 March 1981); doi: 10.1117/12.959612
Show Author Affiliations
Sheldon M Smith, NASA (United States)

Published in SPIE Proceedings Vol. 0257:
Radiation Scattering in Optical Systems
Gary H. Hunt, Editor(s)

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