Method and apparatus for detection of structure failure
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United States of America Patent
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May 13, 2014
Grant Date -
Nov 13, 2008
app pub date -
May 3, 2008
filing date -
May 4, 2007
priority date (Note) -
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Abstract
A detection and alarm system comprises a piezoelectric film sensor and associated circuitry. The sensor detects acoustic emission signals from metallic objects under stress upon which it is affixed. The associated circuitry receives electronic signals from the sensor, creates and evaluates a sensor output value including rate ratio and frequency content of such signals within preset time limits. This data allows the detection of impending failure, an alarm condition, of the metallic object by identifying significant changes in the rate of emission of such sensor signals. An alarm condition may then trigger an alarm signal to warn of such impending failure.
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