BRDF measurements of sunshield and baffle materials for the IRAS telescope

Details BRDF measurements of sunshield and baffle materials for the IRAS telescope BRDF measurements of sunshield and baffle materials for the IRAS telescope

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982bmsb.rept.....s&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Far Infrared Radiation, Infrared Astronomy Satellite, Infrared Telescopes, Angles (Geometry), Bidirectional Reflectance, Diffraction, Gold Coatings, Incidence

Scientific paper

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 deg Martin Black is a diffuse reflector at wavelengths as long as 36 microns. 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.

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