Level detector system for cryogenic liquids

Details Level detector system for cryogenic liquids Level detector system for cryogenic liquids

1974-07-22

1976-03-16

Queisser, Richard C.

Measuring and testing

Liquid level or depth gauge

Thermal type

G01F 2324

Patent

active

039437671

ABSTRACT:
An improvement has been made to a cryogenic liquid level detection system of the type wherein a small electrical current is passed through a filament of superconducting material to generate a voltage proportional to the length of the filament above the liquid level. This improvement involves automatically interrupting the current flow immediately upon the growth of the normal resistance state of the filament above the liquid down to the liquid surface. Normally current flow is then reinitiated after a preset time interval. In this manner there is a minimum energy input to the liquid from the current and thus evaporative losses of the liquid are minimized.

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

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