Photo-acoustic leak detector with multiple beams

Details Photo-acoustic leak detector with multiple beams Photo-acoustic leak detector with multiple beams

1997-03-27

1998-11-10

Brock, Michael

Measuring and testing

With fluid pressure

Leakage

73 405A, 73 41, 73 2402, G01M 316

Patent

active

058346325

ABSTRACT:
A photo-acoustic leak detection system for detecting a gas leaking from a component 30, includes at least two laser beams 24,26, incident on the component 30 and disposed so as to completely illuminate an inspection region 159 around at least a portion 28 of the component 30, each beam having a corresponding wavelength .lambda..sub.1 which is absorbed by the gas, the gas emitting an acoustic signal 36 when the gas absorbs light from at least one of the beams, an acoustic sensor 40, which receives the acoustic signals 36 and provides a sensor signal indicative thereof on a line 42 to a bandpass filter 44 and a synchronous detector 18 which provide a filtered signal indicative of the acoustic signal 36 on a line 50 to a signal processor 52. The processor 52 provides an output signal indicative of the leak in the component 30.

REFERENCES:
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patent: 4772789 (1988-09-01), Maram et al.
patent: 5161408 (1992-11-01), McRae et al.
Photonics Spectra, Apr. 1994, "Laser Applications," Assembly-Line Leak Testing, p. 114.
Brassington, D. J., "Photo-acoustic detection and ranging--a new technique for the remote detection of gases." J. Phys. D: Appl. Phys., 15 (1982), pp. 219-228.
Allen, Jr., John E. et al., "Optoacoustic pulses in a flame." Optics Letters, vol. 1, No. 4, Oct. 1977, pp. 118-120.

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