Reconstructing reflector images in ultrasonic testing of isotropic inhomogeneous media

Abstract

A modification of the C-SAFT algorithm has been suggested that makes it possible to take inhomogeneous properties of the test object into account in order to improve the quality of reflector images. The algorithm is based on calculating the field that is reflected by a point reflector by using the theory of ray propagation of sound in a stratified medium and makes it possible to allow for the presence of two types of waves, their conversion, and uneven boundaries of domains in the test object. Results of applying the algorithm to numerical experiments are presented and demonstrate the operability of the suggested approach when processing echo signals that are calculated by the method of finite differences in a time domain (FDTD).