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Multilayered material characterization by the Lamb wave lens

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3 Author(s)
Degertekin, F.L. ; Bilkent Univ., Ankara Univ., Turkey ; Atalar, A. ; Koymen, H.

The Lamb wave lens excites only one of the possible leaky modes in a multilayered structure at a time by generating conical wavefronts at a fixed incidence angle. In multilayered structures, correct interpretation of the acoustic images requires identification of the layer or interface which is responsible for a particular mode. The Poynting vetor, which is a measure of acoustic energy flow, can be used for this purpose. Calculated and measured curves for a layered material with different interface conditions at a wide frequency range are presented. The variation of Poynting vector components for different frequencies and interfaces as a function of depth and lateral position is calculated. The lateral component of the Poynting vector shows that particular modes are predominantly present in one of the layers or interfaces

Published in:

Ultrasonics Symposium, 1992. Proceedings., IEEE 1992

Date of Conference:

20-23 Oct 1992