Abstract
The Shuttle Infrared Telescope Facility (SIRTF) will operate over wavelengths from 2 to 1000 micrometers with background limited performance. This performance can only be achieved with good stray light suppression which places great emphasis on the absorption and scattering properties of optical black coatings. The stray light suppression performance of SIRTF was analyzed at 10.6 and 118 micrometers for two different optical black coatings by using Arizona's Paraxial Analysis of Radiation Transfer (APART) computer program. The coatings are Martin Black, and Infrablack. The results are presented as the Point Source Normalized Irradiance Transmittance (PSNIT) as a function of off-axis source angle. The dominant stray light paths in SIRTF are discussed with emphasis placed upon the scattering characteristics of the black coatings. The Bidirectional Reflectance Distribution Function (BRDF) of each coating is shown at 10.6 and 118 micrometers for incidence angles of 100 and 600. General conclusions are made about the propagation of stray light in SIRTF so that these results will be instructive for other infrared telescopes.
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