Method and apparatus for detecting and locating perforations in

Details Method and apparatus for detecting and locating perforations in Method and apparatus for detecting and locating perforations in

1996-09-25

1998-06-09

Williams, Hezron E.

Measuring and testing

With fluid pressure

Leakage

73 38, G01M 304

Patent

active

057637652

ABSTRACT:
A method and apparatus detects and locates perforations in membranes used in electrochemical cells. The membrane has first and second oppositely facing major planar surfaces. The first surface is exposed to a first reactant fluid, preferably a gaseous mixture comprising hydrogen, while the second surface is exposed to a second reactant fluid, preferably ambient air comprising oxygen. The first and second reactant fluids are substantially fluidly isolated from each other by the membrane when no perforations are present in the membrane. The first reactant fluid contacts the second reactant fluid when at least one perforation is present in the membrane. The first and second reactant fluids exothermically react upon contact, preferably in the presence of a catalyst, to generate heat, which is then detected using an infrared thermal detector or thermal imaging device or a layer of thermally sensitive film positioned in proximity with the membrane.

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patent: 5235846 (1993-08-01), Fanciullo
patent: 5411682 (1995-05-01), Nagashima

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