25 April 2011 Zero order mode selective excitation and highly resolved observations of lamb waves
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Abstract
In acoustics, Lamb waves are extremely useful for damage detection in sheet materials and tubular products. Among variety of techniques for the generation of lamb waves, lamb waves are detected using contact piezo electric transducers mounted on an aluminum sample. For this task, two pairs of transducers were introduced where each pair mounted on both surfaces of the sample. Mode selective excitation technique is used and two pre-amplifier circuits served as a part of the signal detection. For this application and more precisely with low frequency excitation signal, orthogonal zero order modes are observed in a high resolved fashion in aluminum sample of 1mm thickness. Principles of the developed method together with instrumental details are discussed.
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A. Abdelrahman, A. Abdelrahman, U. Amjad, U. Amjad, D. Jha, D. Jha, K. S. Tarar, K. S. Tarar, W. Grill, W. Grill, } "Zero order mode selective excitation and highly resolved observations of lamb waves", Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 798413 (25 April 2011); doi: 10.1117/12.880602; https://doi.org/10.1117/12.880602
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