Experiential investigation of nonlinear acoustic field structure in two and three dimensions

In this paper, two and three dimensional experimental nonlinear acoustic pressure fields that are produced by circular sources are presented. We developed an experiment systems to measure results of nonlinear acoustic pressure fields for the first three harmonic components along both acoustic and radial axis, in both two and three dimensions. The use of sub-harmonics to improve the lateral and axial image quality is also discussed. In addition, the experimental results are compared with theoretical results for the first three harmonics and are observed to essentially consistent with the theoretical results.