Measuring and testing – Vibration – By mechanical waves
Patent
1997-10-23
2000-03-28
Williams, Hezron
Measuring and testing
Vibration
By mechanical waves
G01N 2914, G01N 2924
Patent
active
060416564
ABSTRACT:
An apparatus for detecting and measuring cracks in plate-like Structures using acoustic emission technique is disclosed. A transducer coupled with the structure is equally sensitive to in-plane and out-of-plane acoustic emission signals. A splitter receives the output signal of the transducer and divides the acoustic emission signal into a high-frequency signal and a low-frequency signal. A circuit generates a high-frequency peak amplitude and a low-frequency amplitude from there high-frequency and low-frequency signals. A computer computes the ratio of the high-frequency peak amplitude to the low-frequency peak amplitude.
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Miller Rose M.
Williams Hezron
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