Temperature monitor and alarm for cryogenic instruments

John B. Thatcher Jr.; Pat Keliher; Carlos Jeanpierre

doi:10.1117/12.178602

23 June 1994 Temperature monitor and alarm for cryogenic instruments

John B. Thatcher Jr., Pat Keliher, Carlos Jeanpierre

Proceedings Volume 2227, Cryogenic Optical Systems and Instruments VI; (1994) https://doi.org/10.1117/12.178602
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

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.

Citation Download Citation

John B. Thatcher Jr., Pat Keliher, and Carlos Jeanpierre "Temperature monitor and alarm for cryogenic instruments", Proc. SPIE 2227, Cryogenic Optical Systems and Instruments VI, (23 June 1994); https://doi.org/10.1117/12.178602

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