A model to predict the transient radiation from segmented annular apertures radiating into solid media

An approach to predict the compressional wave transient radiation in solid load media from elements and arrays comprised of segmented annular apertures is described. The model may also be applied to the simulation of the transient radiation from circular, rectangular, and annular apertures by suitable parameter manipulation. The approach is based on the method developed by Stepanishen to model propagation in a fluid medium. A suitable angular weighting factor, that of Miller and Pursey, is included to account for the multimode nature of solids, A number of experimental results, including single-element and phased array operation, obtained from a prototype segmented annular array system are presented. These results demonstrate good agreement when compared with those obtained from the theoretical model.