Methods and apparatus for detection of air ingress into cryogen vessels
US8418534B2 · kind B2 · utility
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4References
11Claims
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Key dates
| Filing date | Feb 9, 2010 |
| Grant date | Apr 16, 2013 |
| Priority date | — |
| Expiry date | Dec 19, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N9/002
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.