In SITU Bidirectional Reflectance Distribution Function (BRDF) Measurement Facility

B. M. Kale; Barry Broome

doi:10.1117/12.957048

4 April 1979 In SITU Bidirectional Reflectance Distribution Function (BRDF) Measurement Facility

B. M. Kale, Barry Broome

Proceedings Volume 0171, Optical Components: Manufacture and Evaluation; (1979) https://doi.org/10.1117/12.957048
Event: Los Angeles Technical Symposium, 1979, Los Angeles, United States

Abstract

The angular distribution of light scattered from optical surfaces is best described by a Bidirectional Reflectance Distribution Function (BRDF). Scattered light in spaceborne optical systems may be induced by surface contaminants that are present only under the combined conditions of extreme cold, high vacuum, and strong ultraviolet radiation. An instrument is described that gqnerates surface contaminants and measures BRDF in situ. Measurements are performed at 10-0 Tarr pressure and at 77K for angular scatter ranging from one degree away from the specular reflected beam to sixty degrees away from the specular reflected beam. Measured BRDF intensity ranges from 10-° watt per incident watt per steradian to 10-6 watt per incident watt per steradian.

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B. M. Kale and Barry Broome "In SITU Bidirectional Reflectance Distribution Function (BRDF) Measurement Facility", Proc. SPIE 0171, Optical Components: Manufacture and Evaluation, (4 April 1979); https://doi.org/10.1117/12.957048

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