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Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980spie..245..149v&link_type=abstract
In: Cryogenically cooled sensor technology; Proceedings of the Seminar, San Diego, CA, July 29, 30, 1980. (A81-39470 18-35) Bell
Other
Cooling Systems, Cryogenic Cooling, Liquid Helium, Optical Measuring Instruments, Spaceborne Telescopes, Supercritical Flow, Design Analysis, Focal Plane Devices, Heat Exchangers, Infrared Interferometers, Infrared Radiometers, Infrared Telescopes, Mass Flow Rate, Remote Sensors, Space Shuttle Payloads
Scientific paper
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.
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