Bi-angular lens for material characterization
Date
1994
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Source Title
Proceedings of the 1994 IEEE Ultrasonics Symposium
Print ISSN
1051-0117
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Publisher
IEEE
Volume
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Pages
1397 - 1400
Language
English
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Abstract
In this paper a new lens design is proposed for characterization of layered materials. Lamb wave lens employs Lamb waves for this purpose since these waves propagate along interfaces. However, below cut-off angle, the critical angles of Lamb wave modes are low and the generated V(z) curves have small number of oscillations, which in turn causes measurement difficulties and accuracy degradation. Bi-angular lens described in this paper, generates an extra obliquely incident wave, instead of normally incident beam, in order to provide the reference specular reflection. Simulation results as well as experimental results are presented and it is shown that a high sensitivity can be obtained by using this new lens.
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Keywords
Acoustic variables measurement , Acoustic wave reflection , Acoustic wave transmission , Acoustic wave velocity , Characterization , Lenses , Materials , Mathematical models , Oscillations , Sensitivity analysis , Bi-angular lens , Interference pattern , Lamb waves , Leaky wave velocity extraction , Material characterization , Acoustooptical devices