Physics – Optics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1331...98d&link_type=abstract
IN: Stray radiation in optical systems; Proceedings of the Meeting, San Diego, CA, July 12, 13, 1990 (A92-17433 05-74). Bellingh
Physics
Optics
Cassegrain Optics, Computer Programs, Cryogenic Equipment, Earth Orbital Environments, Infrared Telescopes, Spaceborne Astronomy, Cosmic Background Explorer Satellite, Equipment Specifications, Infrared Astronomy Satellite, Mirrors, Thermal Emission
Scientific paper
The APART/PADE program is used to examine whether the SIRTF aperture stop can be moved back to the primary mirror without jeopardizing the requirement for natural background-limited observations. The straylight performance of the baseline design, which has the aperture stop at the secondary mirror, is compared to that of a revised design with the stop at the primary mirror. Both designs include reimaging optics and a LYOT stop, as well as a chopping secondary mirror. The straylight due to off-axis sources and telescope thermal emission is investigated at 50 and 550 microns. It is found that in SIRTF, where every instrument will include reimaging optics and a LYOT stop, the aperture stop may be moved to the primary mirror with modest degradation of the straylight performance.
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