Level indicator for liquid hydrogen tank

Details Level indicator for liquid hydrogen tank Level indicator for liquid hydrogen tank

2007-01-09

2007-01-09

Williams, Hezron (Department: 2856)

Measuring and testing

Volume or rate of flow

Combined

C073S30400R

Reexamination Certificate

active

11009525

ABSTRACT:
A liquid hydrogen tank assembly that employs a level sensor inductively coupled through the tank walls so as to minimize one conductive heat path through the tank walls. The tank assembly includes an inner tank and an outer tank having a vacuum layer therebetween to maintain the liquid hydrogen within the inner tank under cryogenic temperatures. A capacitive level sensor is positioned within the inner tank and provides an electrical indication of the level of the liquid hydrogen within the inner tank. The level sensor is electrically coupled to an inner coil within the inner tank. An outer coil is provided proximate the outer tank wall and is electrically coupled to a signal processing and conditioning circuit.

REFERENCES:
patent: 2409073 (1946-10-01), Sias et al.
patent: 3147878 (1964-09-01), Wissmiller
patent: 3293914 (1966-12-01), Renoult
patent: 3371533 (1968-03-01), Dumas
patent: 5735167 (1998-04-01), Puukangas et al.
patent: 6016697 (2000-01-01), McCulloch et al.
patent: 6295869 (2001-10-01), Delatte
patent: 2001349767 (2001-12-01), None

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