Bidirectional Reflectance Distribution Function (BRDF) Measurements Of Sunshield And Baffle Materials For The Infrared Astronomy Satellite (IRAS) Telescope

Sheldon M. Smith

doi:10.1117/12.932688

31 March 1982 Bidirectional Reflectance Distribution Function (BRDF) Measurements Of Sunshield And Baffle Materials For The Infrared Astronomy Satellite (IRAS) Telescope

Sheldon M. Smith

Author Affiliations +

Proceedings Volume 0304, Modern Utilization of Infrared Technology VII; (1982) https://doi.org/10.1117/12.932688
Event: 25th Annual Technical Symposium, 1981, San Diego, United States

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.

Citation Download Citation

Sheldon M. Smith "Bidirectional Reflectance Distribution Function (BRDF) Measurements Of Sunshield And Baffle Materials For The Infrared Astronomy Satellite (IRAS) Telescope", Proc. SPIE 0304, Modern Utilization of Infrared Technology VII, (31 March 1982); https://doi.org/10.1117/12.932688

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