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Proceedings Paper

SIRTF stray light analysis
Author(s): David G. Elliott; Ann St. Clair Dinger
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Paper Abstract

The Space Infrared Telescope Facility (SIRTF) is a 1-meter cryogenic infrared telescope. Stray light is kept below the natural background by restrictions on sun, Earth, and moon off-axis angles; by conservative baffle design; by the use of advanced diffuse black coatings; and by superfluid helium cooling. The aperture stop is located at the primary mirror rather than at the secondary mirror to increase the aperture and reduce the central obscuration. Stray light from off-axis sources is greater with the aperture stop at the primary than with the aperture stop at the secondary, but the modulation of the signal produced by tilting of the secondary mirror for chopping is less. Stray light from telescope thermal emission is lower with the aperture stop at the primary.

Paper Details

Date Published: 1 December 1991
PDF: 5 pages
Proc. SPIE 1540, Infrared Technology XVII, (1 December 1991); doi: 10.1117/12.48715
Show Author Affiliations
David G. Elliott, Jet Propulsion Lab. (United States)
Ann St. Clair Dinger, NASA/Ames Research Ctr. (United States)

Published in SPIE Proceedings Vol. 1540:
Infrared Technology XVII
Bjorn F. Andresen; Marija Scholl; Irving J. Spiro, Editor(s)

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