An application of Wiener filtering to nondestructive evaluation
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The inverse problem of defect characterization is carried out by comparing theoretical and experimental return echo pulses. Acoustic echo signals of the order of 2 ns long are digitized and fed into a digital computer. A Wiener filter is designed to match the transducer response, so the impulse response of the system approaches a δ function. Experimental results on defects in Si3N4 ceramics are presented which demonstrate the power of such a technique for defect characterization.
[1] G. Kino. The application of reciprocity theory to scattering of acoustic waves by flaws , 1978 .
[2] Gordon S. Kino,et al. Acoustic pulse echo measurements at 200 MHz , 1977 .