11 April 2007 An integrated strategy for detection and imaging of damage using a spatially distributed array of piezoelectric sensors
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Abstract
Permanently attached piezoelectric sensors arranged in a spatially distributed array are under consideration for structural health monitoring systems. Ultrasonic signals transmitted and received between various array elements have been shown to be effective for localizing discrete sites of damage using algorithms based upon changes in signals compared to the undamaged state. Necessary to the success of the various imaging methods which have been proposed is a set of baseline signals recorded under the same conditions as the signals acquired after damage has occurred. Since many conditions other than structural damage can cause changes in ultrasonic signals, proposed here is an integrated strategy whereby damage is first detected and is localized only if the outcome of the detection step is positive. In this manner false alarms can be reduced since signal changes due to benign variations will not be localized and erroneously identified as damage. The detection strategy considers the long time behavior of the signals in the diffuse-like regime where distinct echoes can no longer be identified, whereas the localization strategy is to generate images of damage based upon the early time regime when discrete echoes from boundary reflections and scattering sites are meaningful. Results are shown for an aluminum plate subjected to a combination of temperature variations and introduction of artificial damage.
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Jennifer E. Michaels, Thomas E. Michaels, "An integrated strategy for detection and imaging of damage using a spatially distributed array of piezoelectric sensors", Proc. SPIE 6532, Health Monitoring of Structural and Biological Systems 2007, 653203 (11 April 2007); doi: 10.1117/12.715438; https://doi.org/10.1117/12.715438
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