Abstract
A health monitoring system is presented composed of integrateddisc-shaped, 100 µm thick and 5 mm diameter piezoelectric transducers(PZTs) working sequentially as Lamb wave emitters and receivers.The diagnostic is based on the analysis of Lamb wave signals recorded beforeand after damage. In the composite, delaminations are discontinuitiesproducing mode conversion processes generating various outgoing modes. Themultiresolution processing allows the isolation of various propagation modesand their extraction in order to measure, for various propagation paths, thetime delay between the arrivals of the main burst and of a specific outgoingmode. This process permits, with good accuracy, the localization of damage andthe estimation of its extent. The robustness and portability of this techniqueis demonstrated by the fact that, after validation in our laboratory, it wassuccessfully applied to data coming from an experiment conducted in anotherlaboratory using its own acousto-ultrasonic health monitoring hardwaresystem.
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