Level gauge for liquid helium

Details Level gauge for liquid helium Level gauge for liquid helium

1984-11-21

1987-04-07

Frankfort, Charles

Measuring and testing

Liquid level or depth gauge

Thermal type

73290R, 420901, G01F 2300, C22C 1600, H01B 102, H01B 1200

Patent

active

046550798

ABSTRACT:
A level gauge for liquid helium 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. The superconductive alloys are represented by a formula Zr.sub.100-x.(Ru.sub.y.Rh.sub.1-y).sub.x in which x represents contents of Ru and/or Rh in atomic % and in a numerical value of 22.5.ltoreq.x.ltoreq.27.5 and y represents a numerical value of 0.ltoreq.y.ltoreq.1. The alloys are made of an amorphous phase obtained by rapid quenching a molten alloy material and have a superconducting transition temperature, Tc, of 4.2.degree. to 4.5.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.

REFERENCES:
patent: 3085433 (1963-04-01), Shuveli
patent: 3436713 (1969-04-01), Di Noia
patent: 3496773 (1970-02-01), Cornish
patent: 3856513 (1974-12-01), Chen et al.
patent: 3943767 (1976-03-01), Efferson
patent: 4118984 (1978-10-01), Kuraoka et al.
patent: 4517253 (1985-05-01), Rose et al.
patent: 4564396 (1986-01-01), Johnson et al.
A Device for Controlling the Operation of a Metal Helium Cryostat, by Permyakov et al, Cryogenics, 4-1972.

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