Apparatus for the remote detection of sounds caused by leaks

Details Apparatus for the remote detection of sounds caused by leaks Apparatus for the remote detection of sounds caused by leaks

1989-04-24

1990-12-25

Rosenberger, Richard A.

Optics: measuring and testing

Refraction testing

Schlieren effect

73 405A, 73592, 73655, 381172, G01M 324

Patent

active

049798200

ABSTRACT:
Two laser beams derived from a laser pass through a furnace and are superposed in a laser spot to produce interference fringes having the same pitch as that of a Ronchi grating printed on a retroreflecting screen. Minute fluctuations of the laser beams caused by sound waves from leaks result in intensity fluctuations of the laser spot when the laser fringes move past the fixed grating. A telescope and photocell arrangement detects the light variations to produce an electrical signal which is amplified and filtered to detect the sound of leaks. This non-contact laser Schlieren microphone is sensitive to sounds all along the path of the beams.

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Critical Review of Acoustic and Acoustic Emission Leak Detection Systems 2nd Epri Incipient-Failure Detection Conf.: Proceedings; McAnally(Ed); Report Epri-CS-4748: Conf.-8410452; Oct. 86 (Abstract Only).
New Acoustic Techniques for Leak Detection in Fossil Fuel Plant Components, Report CISE-2005, 1982; Parini, G & Possa, G. (Abstract Only).

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