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Numerical modeling and measurement by pulsed television holography of ultrasonic displacement maps in plates with through-thickness defects

López Vázquez, José CarlosAutor UVIGO; Deán Ben, José LuisAutor UVIGO; Trillo Yáñez, María CristinaAutor UVIGO; Fernández Doval, Ángel ManuelAutor UVIGO; Fernández Fernández, José LuisAutor UVIGO; Amlani, Faisal; Bruno, Oscar P.
Date: 2010-09-01
UNIVERSAL IDENTIFIER: http://hdl.handle.net/11093/219
EDITED VERSION: http://opticalengineering.spiedigitallibrary.org/article.aspx?doi=10.1117/1.3484953
UNESCO SUBJECT: 3311.11 Instrumentos Opticos ; 2209.07 Holografía ; 2201.09 Ultrasonidos
DOCUMENT TYPE: article

Abstract

We present a novel numerical modeling of ultrasonic Lamb and Rayleigh wave propagation and scattering by through-thickness defects like holes and slots in homogeneous plates, and its experimental verification in both near and far field by a self-developed pulsed TV holography system. In contrast to rigorous vectorial formulation of elasticity theory, our model is based on the 2-D scalar wave equation over the plate surface, with specific boundary conditions in the defects and plate edges. The experimental data include complex amplitude maps of the out-of-plane displacements of the plate surface, obtained by a two-step spatiotemporal Fourier transform method. We find a fair match between the numerical and experimental results, which allows for quantitative characterization of the defects.
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