NASA NTRS · 19800000374
Fast response cryogen level sensor
Abstract
Liquid level in cryogenic tank or pipe, or amount of gas trapped in pipeline flow, is monitored electronically by cylindrical capacitive sensor. Changes in liquid level between concentric tubes of capacitor change its impedance, varying current in drive circuit. Since it is oriented parallel to direction of liquid flow, sensor presents little resistance to moving fluid.
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Fitzpatrick, J. B., Maier, L. C.. 1981-01-01. Fast response cryogen level sensor. https://ntrs.nasa.gov/citations/19800000374
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