Analysis of the transient ultrasonic fields radiated in solids by circular and annular sources

Abstract

The transient radiation of ultrasonic fields into isotropic solids by circular and annular sources has been studied. The calculations of the axial and radial components of the particle velocity spatial-temporal distributions were performed using harmonic synthesis approach. The results obtained are explained in terms of direct, compression edge, shear edge, and head waves. The peak value dependences of the different types of waves along the axis and the radius are presented and the explanation of the origin of the edge waves is given. The results obtained may be of particular interest for nondestructive tesing applications.

The role of the coupling term in transient elastography

“…11 Little information is found on the theoretical background of low-frequency elastic waves in soft media. However, many techniques [12][13][14][15][16][17][18] have been developed in order to calculate the transient ultrasonic fields radiated by arbitrary surface sources in solids. Their development is mainly due to ultrasonic field study for medical applications, nondestructive evaluation, and seismology.…”

Impulse ultrasonic fields radiated by a linear transducer through a liquid-solid interface

“…Indeed, the method usually used is that of the impulse response. A lot of works, exploiting this method, are devoted to the field calculation only in the fluid or the solid propagation medium to which the transducer is normally coupled [3]- [5]. In solids, where longitudinal and transverse mode can be propagated, the approach of the direct impulse response is not so easy to implement.…”