8 April 2010 A comparison of 1D and 3D laser vibrometry measurements of Lamb waves
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Abstract
This paper compares and contrasts one-dimensional (1D) and three-dimensional (3D) scanning laser Doppler vibrometer (LDV) measurements of Lamb waves generated by lead zirconate titanate (PZT) transducers. Due to the large cost and capability differences between the previously mentioned systems, this study is provided to highlight differences between these systems. 1D measurements are defined here as measurements of only out-of-plane velocities which are well-suited for studying anti-symmetric Lamb wave modes. 3D measurements provide both in- and out-of-plane velocities, which are especially important when studying both symmetric and anti-symmetric Lamb wave modes. The primary reason for using scanning LDVs is that these systems can make non-contact, accurate surface velocity measurements over a spatially-dense grid providing relatively high resolution image sequences of wave propagation. These scans can result in a clear understanding of Lamb waves propagating in plate-like structures and interacting with structural variations.
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Eric D. Swenson, Eric D. Swenson, Hoon Sohn, Hoon Sohn, Steven E. Olson, Steven E. Olson, Martin P. Desimio, Martin P. Desimio, } "A comparison of 1D and 3D laser vibrometry measurements of Lamb waves", Proc. SPIE 7650, Health Monitoring of Structural and Biological Systems 2010, 765003 (8 April 2010); doi: 10.1117/12.847362; https://doi.org/10.1117/12.847362
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