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High-sensitivity photoacoustic leak testing.

Eric Huang¹, David R Dowling, Timothy Whelan

¹Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109-2133, USA.

The Journal of the Acoustical Society of America

|November 1, 2003

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Photoacoustic leak testing uses a tracer gas and laser to detect gas leaks. This method shows potential to surpass current sensitive leak detection systems.

Area of Science:

Physics
Engineering

Background:

Gas leaks in sealed components pose risks.
Current leak detection methods have limitations.

Purpose of the Study:

To explore the photoacoustic effect for gas leak detection.
To demonstrate a novel photoacoustic leak testing technique.

Main Methods:

Utilized 10.6-micrometer carbon-dioxide laser radiation.
Employed sulfur hexafluoride as a tracer gas.
Conducted experiments on leak rates from 6 x 10(-5) to 5 x 10(-9) cm3/s.

Main Results:

Successfully detected and localized gas leaks using the photoacoustic effect.
Achieved leak detection sensitivity comparable to or exceeding helium mass-spectrometers.

Related Experiment Videos

Observed that tracer gas cloud geometry affects photoacoustic signal amplitude.

Conclusions:

Photoacoustic leak testing is a viable and sensitive method for sealed components.
The technique offers a promising alternative to existing leak detection systems.
Further research into gas cloud geometry effects could optimize the technique.