High sensitivity leak detection method and apparatus

Details High sensitivity leak detection method and apparatus High sensitivity leak detection method and apparatus

1993-08-27

1994-09-06

Williams, Hezron E.

Measuring and testing

With fluid pressure

Leakage

G01M 320

Patent

active

053437403

ABSTRACT:
An improved leak detection method is provided that utilizes the cyclic adsorption and desorption of accumulated helium on a non-porous metallic surface. The method provides reliable leak detection at superfluid helium temperatures. The zero drift that is associated with residual gas analyzers in common leak detectors is virtually eliminated by utilizing a time integration technique. The sensitivity of the apparatus of this disclosure is capable of detecting leaks as small as 1.times.10.sup.-18 atm cc sec.sup.-1.

REFERENCES:
patent: 4593530 (1986-06-01), Longsworth

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