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Proceedings Paper

A Telescope For The Infrared Astronomical Satellite (IRAS)
Author(s): R. L. Hedden
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Paper Abstract

The Infrared Astronomical Satellite (IRAS) will be used to survey the 8 to 120 μm spectrum of the entire sky to the faintest flux levels possible by using state-of-the-art detectors and preamplifiers. As a result of a recently completed study of the telescope and focal plane, a concept has been devised that demonstrates the feasibility of using stored cryogen to cool the telescope for one year of operation in a polar twilight orbit at an altitude of 900 km. Predictions regarding noise equivalent flux density, cryogenic life-time, and the number of noise spikes caused by Van Allen belt radiation are presented. The telescope is cooled both by supercritical and by superfluid helium. The on-board signal processing includes provisions for suppressing noise spikes.

Paper Details

Date Published: 15 November 1976
PDF: 5 pages
Proc. SPIE 0095, Modern Utilization of Infrared Technology II, (15 November 1976); doi: 10.1117/12.955152
Show Author Affiliations
R. L. Hedden, Hughes Aircraft Company (United States)


Published in SPIE Proceedings Vol. 0095:
Modern Utilization of Infrared Technology II
Irving J. Spiro, Editor(s)

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