Accession Number : AD0665786

Title :   REFLECTION AND SUBSEQUENT PROPAGATION OF A FINITE AMPLITUDE ULTRASONIC WAVE.

Descriptive Note : Technical rept.,

Corporate Author : TENNESSEE UNIV KNOXVILLE ULTRASONICS LAB

Personal Author(s) : Van Buren,Arnie Lee

Report Date : DEC 1967

Pagination or Media Count : 141

Abstract : When an ultrasonic wave is reflected from an interface, a phase shift which is dependent on the angle of incidence occurs. If the wave is of finite amplitude, this phase shift causes relative spatial shifting of the Fourier harmonic components. A model which assumes independent reflection of the Fourier components is used to determine the resulting unstable wave shape. The phase shift upon reflection of a specific Fourier component is derived from linear theory. The phases and amplitudes of the resynthesized components are calculated for different distances of propagation of the wave after reflection. An experimental technique is developed to measure the amplitudes and phases of the first two Fourier components in the reflected wave. The results of these measurements are found to be in good agreement with the theoretical results. (Author)

Descriptors :   (*ULTRASONIC RADIATION, REFLECTION), (*SOUND TRANSMISSION, PROPAGATION), MATHEMATICAL MODELS, PHASE SHIFT CIRCUITS, INTERFACES, SCHLIEREN PHOTOGRAPHY, FOURIER ANALYSIS, COMPUTER PROGRAMS, SOLIDS, LIQUIDS, THESES

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE