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Proceedings Paper

Metamorphosis of bulk waves to Lamb waves in anisotropic piezoelectric crystals
Author(s): A. Shelke; A. Habib; U. Amjad; M. Pluta; T. Kundu; U. Pietsch; W. Grill
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Paper Abstract

Acoustic bulk waves were excited by local electric field probe in an anisotropic piezo-electric crystal Lithium Niobate (X-cut). A narrow pulse with a width of 25 ns was used for excitation to obtain wide frequency content in the Fourier domain. A wide spectrum ensures metamorphosis of bulk waves into Lamb waves for scan lengths comparable to the involved wavelengths. The low frequency content experiences multiple reflections from the two surfaces of the plate and disperses along the propagation direction. Acoustic bulk wave's evolution and transformation to Lamb waves are illustrated and explained with the aid of the Lamb wave dispersion phenomenon. The holographic images in the Fourier domain exemplify the metamorphosis of waves during propagation following the excitation at an approximate point source.

Paper Details

Date Published: 31 March 2011
PDF: 12 pages
Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 798415 (31 March 2011); doi: 10.1117/12.880598
Show Author Affiliations
A. Shelke, The Univ. of Arizona (United States)
A. Habib, Univ. Siegen (Germany)
U. Amjad, Univ. Leipzig (Germany)
M. Pluta, Univ. Leipzig (Germany)
T. Kundu, The Univ. of Arizona (United States)
U. Pietsch, Univ. Siegen (Germany)
W. Grill, Univ. Leipzig (Germany)

Published in SPIE Proceedings Vol. 7984:
Health Monitoring of Structural and Biological Systems 2011
Tribikram Kundu, Editor(s)

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