The Precision Segmented Reflector program - On-orbit thermal behavior of the Submillimeter Imager and Line Survey telescope

Details The Precision Segmented Reflector program - On-orbit thermal behavior of the Submillimeter Imager and Line Survey telescope The Precision Segmented Reflector program - On-orbit thermal behavior of the Submillimeter Imager and Line Survey telescope

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991thph.confq....t&link_type=abstract

AIAA, Thermophysics Conference, 26th, Honolulu, HI, June 24-26, 1991. 12 p. NASA-supported research.

Astronomy and Astrophysics

Astronomy

High Temperature Environments, Radio Telescopes, Reflectors, Spaceborne Telescopes, Submillimeter Waves, Thermal Protection, Cryogenic Cooling, Cryostats, Spaceborne Astronomy, Temperature Effects

Scientific paper

The Precision Segmented Reflector program and the Submillimeter Imager and Line Survey mission are overviewed. The temperature requirements, thermal design and environment, as well as the on-orbit thermal performance of a 3.65-m-diameter passively-cooled submillimeter-wavelength telescope are discussed, and focus is placed on the geometric and thermal mathematical models employed in the study. Attention is given to an inflatable space-rigidized sunshade protecting the primary mirror thermally and the highly elliptical orbit chosen to reduce heat input from the earth. Primary-reflector temperature predictions are shown to indicate that a large spatial gradient can exist and the magnitude of the gradient is a strong function of the telescope pitch angle. It is suggested that the cryostat outer-shell temperature may be further lowered with the introduction of a rectangular shield between a solar array and the cryostat.

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