Methods and apparatus for detection of air ingress into cryogen vessels
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United States of America Patent
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Apr 16, 2013
Grant Date -
Aug 12, 2010
app pub date -
Feb 9, 2010
filing date -
Feb 10, 2009
priority date (Note) -
Expired
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Abstract
In an apparatus and a method for detecting deposition of solid frost caused by air ingress into a cryogen vessel, a quartz crystal microbalance, that includes a crystal sensor, is placed within the cryogen vessel, and an actuating circuit actuates resonance of the crystal sensor, and detection equipment detects a change in the resonant characteristics of the crystal sensor caused by frost deposition on the crystal sensor, and signaling equipment indicates the detected change.
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