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Ultrasonic Non-Destructive Testing (US NDT) has become widely used in various fields of applications to probe media. Exploiting the surface measurements of the ultrasonic incident waves echoes after their propagation through the medium, it allows to detect potential defects (cracks and inhomogeneities) and characterize the medium. The understanding and interpretation of those experimental measurements is performed with the help of numerical modeling and simulations. However, classical numerical methods can become computationally very expensive for the simulation of wave propagation in the high frequency regime. On the other hand, asymptotic techniques are better suited to model high frequency scattering over large distances but nevertheless do not allow accurate simulation of complex diffraction phenomena. Thus, neither numerical nor asymptotic methods can individually solve high frequency diffraction problems in large media, as those involved in UNDT controls, both quickly and accurately, but their advantages and limitations are complementary. Here we propose a hybrid strategy coupling the surface integral equation method and the ray tracing method to simulate high frequency diffraction under speed and accuracy constraints. This strategy is general and applicable to simulate diffraction phenomena in acoustic or elastodynamic media. We provide its implementation and investigate its performances for the 2D acoustic diffraction problem. The main features of this hybrid method are described and results of 2D computational experiments discussed. 1. Motivations Ultrasonic Non-Destructive Testing (US NDT) aims at probing continuous media by propagating high frequency waves. During an Ultrasonic Non-Destructive test, a wave is generated outside the material and propagates through the medium, bouncing back against interfaces and diffracting from edges or small defects (inclusions, cracks...). Its propagation response is detected by receivers placed at the surface of the medium and analyzed to obtain useful information on the structure and integrity of the probed material. Numerical simulation has become an important tool to understand and interpret those measurements, allowing to detect and characterize surface breaking or internal defects. It has also become of great interest to help

journal of physics. conference series

A hybrid method combining the surface integral equation method and ray tracing for the numerical simulation of high frequency diffraction involved in ultrasonic NDT