Parabolic Mirror and Air-Coupled Transducer for Multimodal Plate Wave Detection
作者： Bernard Hosten
DOI: 10.1063/1.1570274
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摘要: A conventional contact piezoelectric transducer, excited by a broadband burst (chirp) that covers its whole frequency bandwidth, is used as transmitter to simultaneously generate several Lamb waves in plate. Throughout the propagation, these modes leak energy into ambient air, producing bulk many directions. The association of parabolic mirror and an air‐coupled transducer (PMAT) allows be received air with large angular aperture. By displacing PMAT direction parallel plate, but without changing orientation like when standard receivers are used, series temporal waveforms captured. Signal processing then phase velocity measured wave number domains. These resulting data identify moduli elasticity for composite plates made long glass fibers polymer matrix.
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