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Proceedings Paper

CIRRIS 1A cryogen system performance
Author(s): Edward W. Vendell; David E. Morse; Andrew Landoch
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Paper Abstract

The Cryogenic InfraRed Radiance Instrumentation for Shuttle (CIRRIS 1A) instrument, successfully flown and operated on the Shuttle Discovery from 28 April to 6 May 1991, was designed to operate at supercritical helium temperatures. During flight, the focal plane temperature control and telescope contamination purge systems performed as designed and 36 hours of excellent data was obtained; however, the parasitic helium flow rate was higher than expected. This paper reviews thermal data obtained for the CIRRIS 1A cooling system during both ground and flight operations. The temperature control and purge systems are discussed, along with helium flow rates, dewar helium pressure, and thermal stratification. In addition, possible reasons for the high on-orbit parasitic flow rate are presented.

Paper Details

Date Published: 21 January 1993
PDF: 12 pages
Proc. SPIE 1765, Cryogenic Optical Systems and Instruments V, (21 January 1993); doi: 10.1117/12.140887
Show Author Affiliations
Edward W. Vendell, Utah State Univ. (United States)
David E. Morse, Utah State Univ. (United States)
Andrew Landoch, Air Force Phillips Lab. (United States)

Published in SPIE Proceedings Vol. 1765:
Cryogenic Optical Systems and Instruments V
Ramsey K. Melugin, Editor(s)

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