A Receiver Model for Ultrasonic Ray Tracing in an Inhomogeneous Anisotropic Weld
Artikel i vetenskaplig tidskrift, 2014
In this paper, a receiver model for ultrasonic ray tracing simulation is described. This is a complementary
part of an existing simulation model and is the next step towards a numerical solution
to the inverse problem and thus a NDT methodology for characterization of the dendrite orientation
in a weld. The establishment of the receiver model is based on the electromechanical reciprocity
principle. A concise retrospect of the weld model and the 2D model is made. The reciprocity
principle is applied in an original way to handle the model problem including the back wall.
Experimental qualitative validations for both P and SV waves on a specific weld are also made for
C-scans included in this paper. Two different cases are studied. The first is a direct incidence of an
ultrasonic ray towards the weld, and the second is a reflection from the back surface in the base
material followed by an incidence to the weld. Even though mode-converted rays are excluded in
the simulations, both the P and SV probe-models show the same behavior as the experimental results.
The qualitative validation though reveals that it even if a thorough time-gating of received
information would enable exclusion of mode-conversion in the model, inaccuracy of experimental
results is affecting the evaluation of the weld model.
Ultrasonic Receiver Model
2D Ray Tracing