TITLE:
A Receiver Model for Ultrasonic Ray Tracing in an Inhomogeneous Anisotropic Weld
AUTHORS:
Q. Liu, Gert Persson, Hakan Wirdelius
KEYWORDS:
Ultrasonic Receiver Model, Reciprocity Principle, 2D Ray Tracing
JOURNAL NAME:
Journal of Modern Physics,
Vol.5 No.13,
July
30,
2014
ABSTRACT: 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.