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Proceedings Paper

Temperature monitor and alarm for cryogenic instruments
Author(s): John B. Thatcher Jr.; Pat Keliher; Carlos Jeanpierre
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Paper Abstract

Internal temperatures in filled cryostats must be continuously monitored to preserve the health and safety of hardware and personnel. The accidental response of cryogenic gases into the atmosphere pose a health threat and, if the gases are flammable, may lead to an explosion. One indication of an imminent cryogen release is the sudden increase in cryogen temperature. Although there are many data acquisition systems and temperature monitoring products commercially available, these systems lack the portability and safety features required during cryostat qualification tests and transport. This paper describes a temperature monitor and alarm circuit developed for the Spirit II solid hydrogen cryostat program. The instrument is battery-operated, accurate, portable, and intrinsically safe in an explosive atmosphere.

Paper Details

Date Published: 23 June 1994
PDF: 7 pages
Proc. SPIE 2227, Cryogenic Optical Systems and Instruments VI, (23 June 1994); doi: 10.1117/12.178602
Show Author Affiliations
John B. Thatcher Jr., Lockheed Palo Alto Research Lab. (United States)
Pat Keliher, Lockheed Palo Alto Research Lab. (United States)
Carlos Jeanpierre, Lockheed Palo Alto Research Lab. (United States)

Published in SPIE Proceedings Vol. 2227:
Cryogenic Optical Systems and Instruments VI
James B. Heaney; Lawrence G. Burriesci, Editor(s)

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