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Proceedings Paper

Supercritical Helium Cooling Of Optical Sensors
Author(s): Edward W. Vendell
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Paper Abstract

The operational restrictions on several current interferometer/radiometer instruments are such that focal planes, optical components, and telescope baffles must be maintained at temperatures near 8°K, 20°K, and 80°K respectively. One reliable method of achieving this is to expel supercritical helium from a supply dewar at constant pressure by applying energy to a dewar heater; the resulting flow then passes serially through three (or more) heat exchangers to achieve the desired cooling before being vented through a pressure regulator valve. A convenient set of approximate, time-dependent equations that can be programmed on a hand-held calculator for the preliminary design of a supercritical helium cooling system are presented in this paper. Predicted temperature and mass flow rates based on the simplified equations agree within 5 percent of those resulting from analyses by other researchers. The equations are applied to a particular cooler system for the CIRRIS 82 instrument scheduled to be flown on the Space Shuttle in 1982.

Paper Details

Date Published: 3 November 1980
PDF: 9 pages
Proc. SPIE 0245, Cryogenically Cooled Sensor Technology, (3 November 1980); doi: 10.1117/12.959346
Show Author Affiliations
Edward W. Vendell, Utah State University (United States)

Published in SPIE Proceedings Vol. 0245:
Cryogenically Cooled Sensor Technology
Ronald J. Huppi, Editor(s)

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