Liquid level indicator for an extremely low temperature-liquefie

Details Liquid level indicator for an extremely low temperature-liquefie Liquid level indicator for an extremely low temperature-liquefie

1977-08-29

1978-10-10

Woodiel, Donald O.

Measuring and testing

Liquid level or depth gauge

Thermal type

G01F 2324

Patent

active

041189841

ABSTRACT:
In a liquid level indicator for an extremely low temperature-liquefied gas wherein a current is caused to flow through a superconductor wire immersed in the extremely low temperature-liquefied gas, a voltage across terminals of the superconductor wire is measured, and the liquid level of the liquefied gas lying between the terminals is gauged on the basis of the measured value, the improvement therein comprising the providing of a current supply portion which, at first, increases the current to be fed to the superconductor wire up to the so-called plateau region in a current - voltage hysteresis curve of the superconductor wire, and thereafter, decreases it down to a return-path rectilinear region in the curve departing from the plateau region, the liquid level being gauged on the basis of the measured value of the terminal voltage of the superconductor wire as obtained by the use of the decreased current. The improved liquid level indicator is capable of measuring the liquid levels of, for example, helium over from the normal-pressure state to the superfluid state.

REFERENCES:
patent: 3267730 (1966-08-01), Satterthwaite et al.
patent: 3496773 (1970-02-01), Cornish
patent: 3943767 (1976-03-01), Efferson

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