Far-Infrared (FIR) Optical Black Bidirectional Reflectance Distribution Function (BRDF)

Sheldon M Smith

doi:10.1117/12.959612

3 March 1981 Far-Infrared (FIR) Optical Black Bidirectional Reflectance Distribution Function (BRDF)

Sheldon M Smith

Proceedings Volume 0257, Radiation Scattering in Optical Systems; (1981) https://doi.org/10.1117/12.959612
Event: 1980 Huntsville Technical Symposium, 1980, Huntsville, United States

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.

Citation Download Citation

Sheldon M Smith "Far-Infrared (FIR) Optical Black Bidirectional Reflectance Distribution Function (BRDF)", Proc. SPIE 0257, Radiation Scattering in Optical Systems, (3 March 1981); https://doi.org/10.1117/12.959612

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