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Publication Citation: Time and Polarization Resolved Ultrasonic Testing of Materials

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Author(s): Gerald V. Blessing; D Xiang; Nelson N. Hsu;
Title: Time and Polarization Resolved Ultrasonic Testing of Materials
Published: January 01, 1996
Abstract: We have developed a transducer which allows the benefits of Line Focus Beam (LFB) acoustic microscopy to be realized over large areas, using a conventional pulser-receiver. Experimental evidence is presented to show that the transducer is correctly modeled in detail by Green?s function theory, and that all relevant wave speeds can also be predicted using a much simpler geometrical ray model. Data obtained by simply rotating the transducer a fixed distance above the specimen are presented using grey-scale plots which establish the ease with which anisotropy can be revealed. Finally, a grey-scale plot of rotational-scan data recast in terms of velocity is shown to demonstrate the simultaneous detection of both surface and pseudo-surface waves in the same crystallographic orientation of a silicon specimen.
Conference: American Society for Nondestructive Testing
Proceedings: Proceedings of the First US-Japan Symposium on Advances in NDT
Pages: pp. 205 - 206
Keywords: Nondestructive evaluation;Ultrasonics
Research Areas: Mechanical Metrology