Verification of the acoustic computer model for the case of two tilted planar reflectors

The modelling of the ultrasonic signals reflected from complex curved surfaces is a very complicated task. In order to simplify this task the reflectors are decomposed into multiple planar elements. Then the signals reflected by the planar areas and the areas between two planar elements oriented under some angle can be analysed separately. The objective of this study was verification of the acoustic computer model by simulation and experimentally for the region containing boundary between two planar areas. The used model enables calculation of the signals, reflected by components of complicated geometry decomposed into triangles. Verification of the computer model was carried out comparing the C-scan images obtained experimentally and by simulation. The reflectors were composed of two triangles with different tilt angles to each other. The simulations show, that a shape of the reflector can be recognised only in the case of the specular or close to the specular reflection. The edges of the reflectors can be seen only when they are parallel to the transducer surface. Comparison of the experimental and simulated results shows that the model enables to obtain adequate reflected signals. The good coincidence of the simulated and the experimental signals has been obtained.