NASA NTRS · 19690000210
Improved liquid-level sensor for cryogenics
Abstract
Liquid-level indicator, consisting of a diode heated by a resistor, allows simultaneous use of two or three of the liquids nitrogen, hydrogen, and helium. Operation depends on strong temperature-dependence of the forward resistance of a germanium diode and the difference between liquid and vapor in heat-transfer properties.
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Hyman, L. G., Sheppard, J. F., Spinka, H.. 1969-07-01. Improved liquid-level sensor for cryogenics. https://ntrs.nasa.gov/citations/19690000210
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