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Proceedings Paper

Bidirectional Reflectance Distribution Function (BRDF) Measurements Of Sunshield And Baffle Materials For The Infrared Astronomy Satellite (IRAS) Telescope
Author(s): Sheldon M. Smith
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Paper Abstract

Measurements of the far-infrared bidirectional reflectance distribution functions (BRDF) of four samples of Martin Black coating and one sample of gold-coated aluminum from the telescope to be flown on the Infrared Astronomy Satellite (IRAS) are presented. At incidence angles near 35°, Martin Black is a diffuse reflector at wavelengths as long as 36 μm. However, by 112 μm it has become quite specular. The gold coated aluminum sample from the IRAS sunshield has a visible grain which causes a strong diffraction enhancement of the BRDF at large nonspecular angles. This enhancement from the sunshield will increase the stray light level inside the telescope.

Paper Details

Date Published: 31 March 1982
PDF: 9 pages
Proc. SPIE 0304, Modern Utilization of Infrared Technology VII, (31 March 1982); doi: 10.1117/12.932688
Show Author Affiliations
Sheldon M. Smith, NASA/Ames Research Center (United States)

Published in SPIE Proceedings Vol. 0304:
Modern Utilization of Infrared Technology VII
Irving J. Spiro, Editor(s)

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