Wednesday, December 9, 1987 12:00 p.m.
Applied Research Laboratories
The University of Texas at Austin
Some of the interesting nonlinear phenomena exhibited by focused finite-amplitude sound beams will be discussed. Linear, low-amplitude focusing will be reviewed with emphasis on a solution convenient to use in a quasilinear analysis. A parabolic wave equation is used to describe the nonlinear field. Numerical results for different choices of nonlinearity, focal gain, and absorption will be presented. Previous experimental results and a description of an experiment to he performed soon at ARL will be given. Some applications especially to acoustic microscopy will be discussed.