Accession Number : ADA197614

Title :   Nonlinear Acoustics: Reflection and Refraction, Scattering of Sound by Sound, and Periodic Media.

Descriptive Note : Annual summary rept. no. 4,

Corporate Author : TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS

Personal Author(s) : Blackstock, David T.

Report Date : 01 JUL 1988

Pagination or Media Count : 22

Abstract : Research on three topics in nonlinear acoustics is described. 1. Reflection and refraction at a plane interface between two fluids. Previously a modified form of Snell's law was derived; theoretical work is underway to investigate assumptions on which the derivation was based. 2. Scattering of sound by sound. Work on a single beam experiment and a crossed-beams experiment is in progress. 3. Propagation in periodic media. An experiment is being designed to measure finite-amplitude distortion in a plane wave tube loaded periodically with reactive branch elements. Other work, on noncollinear interaction and on biomedical ultrasonics, is described briefly. Two journal articles, five oral papers, and one technical report are listed. Keywords: Nonlinear acoustics; Periodic media; Scattering of sound by sound; Noncollinear interaction; Refraction; Reflection; Waveguide; Dispersion.

Descriptors :   *BIOACOUSTICS, *ACOUSTIC SCATTERING, ACOUSTICS, BIOMEDICINE, FLUIDS, INTERFACES, MEDIA, NONLINEAR SYSTEMS, PLANE WAVES, REFRACTION, SNELLS LAW, THEORY, TUBES, ULTRASONICS.

Subject Categories : Acoustics
      Medicine and Medical Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE