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Acoustical Detection Of Leakage In A CombustorAbnormal combustion excites characteristic standing wave. Acoustical leak-detection system gives early warning of failure, enabling operating personnel to stop combustion process and repair spray bar before leak grows large enough to cause damage. Applicable to engines, gas turbines, furnaces, and other machines in which acoustic emissions at known frequencies signify onset of damage. Bearings in rotating machines monitored for emergence of characteristic frequencies shown in previous tests associated with incipient failure. Also possible to monitor for signs of trouble at multiple frequencies by feeding output of transducer simultaneously to multiple band-pass filters and associated circuitry, including separate trigger circuit set to appropriate level for each frequency.
Document ID
Document Type
Other - NASA Tech Brief
Puster, Richard L.
(NASA Langley Research Center, Hampton, VA.)
Petty, Jeffrey L.
(PRC Kentron, Inc.)
Date Acquired
August 16, 2013
Publication Date
August 1, 1993
Publication Information
Publication: NASA Tech Briefs
Volume: 17
Issue: 8
ISSN: 0145-319X
Subject Category
Electronic Systems
Report/Patent Number
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.

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