Examination of Reflection from a Disk using Linear Phased Array Probe in Immersion Mode

Abstract

Numerical model has been developed in this study based on Huygens and Fermat principles applied to calculate the interference of signals emitted by all elements in an active group of a phased array probe for one focus law. Calculations are presented as ultrasonic field emitted by point source substituting for the active group of the phased array probe, and located in its center. Kirchhoff approximation model is also used to present the field emitted by each rectangular element in the active group, thus accounting for the element length influence on the field emitted by a phased array probe. Findings are shown of ultrasonic field transmitted and received by the same active group of linear phased array probe, after its reflection from infinite plane and disk reflector. Results are illustrated in amplitude–distance type nomographic charts for various reflector diameters (DGS) for one focal law. The theoretical model developed has been validated by experimental results of immersion ultrasonic testings.