Level gauge for liquid helium

Details Level gauge for liquid helium Level gauge for liquid helium

1986-01-24

1988-05-24

Cuchlinski, Jr., William A.

Measuring and testing

Liquid level or depth gauge

Thermal type

73290R, 73304R, 420901, G01F 2324, C22C 1600, H01B 102, H01B 1200

Patent

active

047458062

ABSTRACT:
A level gauge for liquid helium suitable for use under a higher vapor pressure comprising a sensing element in the form of a ribbon wire made of superconductive alloys and a tube supporting the sensing element which tube is inserted into liquid helium upon measurement. Chemical composition of the superconductive alloys are represented by a formula, Zr.sub.100-x (Ru.sub.1-y Rh.sub.y).sub.x, in which x represents a content of Ru and/or Rh in atomic % and in a numerical value of 17.0.ltoreq.x.ltoreq.22.5 and y represents a numerical value of .ltoreq.y.ltoreq.1. The alloys are made of an amorphous phase obtained by rapid quenching of a molten alloy material and have a superconducting transition temperature, Tc, of 4.5.degree. to 5.2.degree. K. When the level gauge is immersed in liquid helium, a portion of the sensing element below the level of the liquid helium has a zero electric resistance because of the superconductivity of the alloy, so that the level of the liquid helium can be detected by a variation in resistance of the sensing element.

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patent: 4566323 (1986-01-01), Masumoto et al.
patent: 4655079 (1987-04-01), Masumoto et al.

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