Figure 1 shows a simulated inspection configuration in normal incidence where a scan was performed by moving
the probe from a distance of 100m of the block to a distance of 0mm. The side drilled hole is at a 15mm depth.
Results show that the ray-based method is in better agreement with finite elements than the plane-wave
approximation, especially in the near field. This is interpreted as a consequence of the better accounting of the
effects on probe aperture, which increases in the near-field, by the ray-based method.