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Method and apparatus for nondestructive testingHigh voltage is applied to an arc gap adjacent to a test specimen to develop a succession of high frequency arc discharges. Those high frequency arc discharges generate pulses of ultrasonic energy within the test specimen without requiring the arc discharges to contact that test specimen and without requiring a coupling medium. Those pulses can be used for detection of flaws and measurements of certain properties and stresses within the test specimen.
Document ID
19740007282
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Hoop, J. M. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
September 3, 2013
Publication Date
January 1, 1974
Subject Category
General
Report/Patent Number
Patent Number: NASA-CASE-MFS-21233-1
Patent Application Number: US-PATENT-APPL-SN-246056
Patent Number: US-PATENT-3,782,177
Accession Number
74N15395
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
NASA-CASE-MFS-21233-1|US-PATENT-3,782,177
Patent Application
US-PATENT-APPL-SN-246056

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