Method and system for detecting leaks in a plugged honeycomb...

Details Method and system for detecting leaks in a plugged honeycomb... Method and system for detecting leaks in a plugged honeycomb...

2006-05-16

2006-05-16

Williams, Hezron (Department: 2856)

Measuring and testing

With fluid pressure

Leakage

C374S005000

Reexamination Certificate

active

07043964

ABSTRACT:
A method for detecting leaks in a plugged honeycomb structure includes directing a gas at a first end face of the honeycomb structure at a temperature that is different from a temperature of the honeycomb structure and observing a temperature distribution at a second end face of the honeycomb substrate using an infrared detector, wherein the gas directed at the first end face of the honeycomb structure emerges preferentially at the second end face of the honeycomb structure at locations where the cells in the honeycomb structure are defective and appear as thermal spots in the temperature distribution.

REFERENCES:
patent: 3791194 (1974-02-01), Pontello
patent: 5102434 (1992-04-01), Hijikata et al.
patent: 5540691 (1996-07-01), Elstrom et al.
patent: 6301097 (2001-10-01), Ellsworth et al.
patent: 2004/0000186 (2004-01-01), Hagg et al.
patent: 2004/0003914 (2004-01-01), Avila

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