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18 April 2012 Characterization of mode selective actuator and sensor systems for Lamb wave excitation
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Structural Health Monitoring (SHM) based on Lamb waves, a type of ultrasonic guided waves, is a promising technique for in-service inspection of composite structures. This study presents the development of mode selective actuator and sensor systems based on interdigital transducer (IDT) design. Various parameters such as wavelengths, number and apodization of electrodes as well as eigenfrequencies of the transducer are characterized. Therefore, an analytical model based on the theory of surface acoustic wave (SAW) filters is investigated in order to evaluate the acoustic response of the transducer. Furthermore, experimental tests on composite plates are performed.
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Daniel Schmidt, Christoph Heinze, Wolfgang Hillger, Artur Szewieczek, Michael Sinapius, and Peter Wierach "Characterization of mode selective actuator and sensor systems for Lamb wave excitation", Proc. SPIE 8348, Health Monitoring of Structural and Biological Systems 2012, 83480R (18 April 2012);

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