Air-Coupled Nondestructive Evaluation Dissected
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Springer New York LLC
Abstract
This work develops a two-dimensional theoretical model to simulate the behavior of a fully non-contact air-coupled nondestructive evaluation system for a thin isotropic plate. The model is divided into transmission, guided wave propagation and reception phase. The validation of the complete model was carried out by modeling the same system by means of finite element method using a Multiphysics software. In addition, the dependency of the generated Lamb waves on different transmitter’s parameters and incidence angle is thoroughly investigated. The results of the acoustic pressure excited by the transducer, the out-of-plane velocity amplitudes for the generated first antisymmetric Lamb wave mode, and the radiated pressure from the plate caused by the leaky Lamb wavefield were all compared between the two models and a reasonable degree of similarity was found. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.
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Acoustic field modeling, Air-coupled ultrasound, Lamb waves, Nondestructive testing, Acoustic fields, Guided electromagnetic wave propagation, Scattering parameters, Surface waves, Ultrasonic waves, Acoustic pressures, Air-coupled ultrasounds, Degree of similarity, Multiphysics software, Non destructive evaluation, Non-destructive evaluation system, Out-of-plane velocity, Theoretical modeling, Nondestructive examination