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17 April 2013 Pressure mapping system based on guided waves reflection
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In this paper, a guided wave-based pressure mapping system is presented for medical and touch-screen applications. Piezoceramics are used as actuators and to measure the reflected waves due to an added mass or local pressure, responsible for a change of local surface impedance. SHM imaging algorithms are implemented in order to obtain cartography of the reflections and deduce the presence, localization and intensity of pressure spots. Analytical and numerical models are validated on an aluminum plate prototype instrumented using 1 actuator and 2 sensors. It is observed that imaging of single or multiple pressure spots is achieved using both A0 and S0 modes around 300 kHz with a resolution of 0.5 mm.
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Nicolas Quaegebeur, Patrice Masson, Louis-Philippe Brault, Nicolas Beaudet, and Philippe Sarret "Pressure mapping system based on guided waves reflection", Proc. SPIE 8695, Health Monitoring of Structural and Biological Systems 2013, 86952X (17 April 2013);

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