Bidirectional Reflectance Distribution Function (BRDF) Measurements Of Stray Light Suppression Coatings For The Space Telescope (ST)

Donald B. Griner

doi:10.1117/12.957400

27 September 1979 Bidirectional Reflectance Distribution Function (BRDF) Measurements Of Stray Light Suppression Coatings For The Space Telescope (ST)

Donald B. Griner

Author Affiliations +

Proceedings Volume 0183, Space Optics II; (1979) https://doi.org/10.1117/12.957400
Event: 1979 Huntsville Technical Symposium, 1979, Huntsville, United States

Abstract

A knowledge of the bidirectional reflectance distribution function (BRDF) of black coatings used on stray light suppression systems is extremely important for the Space Telescope (ST). The ST stray light suppression requirement is to reduce Earth, Moon, and Sun light in the focal plane to a level equivalent to one 23 My star per square arcsecond, an attenuation of 14 orders of magnitude. Because of the large size of the ST, it is impractical to verify the performance of a proposed baffle system design by full scale tests, so a computer analysis is used to select the design. To insure an accurate computer analysis, a knowledge of the diffuse scatter at all angles from the surface of the coatings, for all angles of incident light, is required. During the early phases of the ST program, a BRDF scanner was built at the Marshall Space Flight Center to study the scatter from black materials. This paper describes that apparatus and gives the result of measurements on samples proposed for use on the ST.

Citation Download Citation

Donald B. Griner "Bidirectional Reflectance Distribution Function (BRDF) Measurements Of Stray Light Suppression Coatings For The Space Telescope (ST)", Proc. SPIE 0183, Space Optics II, (27 September 1979); https://doi.org/10.1117/12.957400

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