Carbon granule probe microphone for leak detection

Details Carbon granule probe microphone for leak detection Carbon granule probe microphone for leak detection

1983-06-01

1985-02-12

Myracle, Jerry W.

Measuring and testing

With fluid pressure

Leakage

73753, G01M 324

Patent

active

044983336

ABSTRACT:
A microphone which is not subject to corrosion is provided by employing carbon granules to sense sound waves. The granules are packed into a ceramic tube and no diaphragm is used. A pair of electrodes are located in the tube adjacent the carbon granules and are coupled to a sensing circuit. Sound waves cause pressure changes on the carbon granules which results in a change in resistance in the electrical path between the electrodes. This change in resistance is detected by the sensing circuit. The microphone is suitable for use as a leak detection probe in recovery boilers, where it provides reliable operation without corrosion problems associated with conventional microphones.

REFERENCES:
patent: 1296683 (1919-03-01), Maxfield
patent: 1634210 (1927-06-01), Reisz
patent: 2171793 (1937-02-01), Huth
patent: 2548947 (1951-04-01), Clewell
patent: 3831561 (1974-08-01), Yamamoto et al.
patent: 4309576 (1981-01-01), Corrigan

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