Accession Number : AD0708018

Title :   PIEZOELECTRIC RAYLEIGH WAVE EXCITATION BY BULK WAVE SCATTERING,

Corporate Author : POLYTECHNIC INST OF BROOKLYN FARMINGDALE N Y DEPT OF ELECTROPHYSICS

Personal Author(s) : Bertoni,Henry L.

Report Date : JUN 1969

Pagination or Media Count : 29

Abstract : The excitation of a Rayleigh surface wave on a piezoelectric crystal by the scattering of bulk waves from strips deposited on the crystal's surface is considered. Using small scatterer approximations to obtain a lower limit for the strength of excitation that can be obtained by the scattering method, the Rayleigh wave excitation resulting from the mass of the deposited strips is determined. Numerical calculations for CdS, LiNbO3 and isotropic solids indicate that this method of excitation is feasible. Simple, small scatterer estimates for the order of magnitude of the excitaion resulting from the conductivity of strips deposited on CdS and LiNbO3 suggests that the Rayleigh wave can be more strongly excited through the mass of the strips than through their conductivity. In order to evaluate the Rayleigh wave excitation, an expression has been derived that describes the excitation of elastic surface waves, guided by configurations composed of infinite, parallel layers of arbitrary piezoelectric and elastic materials, when the source of these waves are prescribed, two-dimensional force and current distributions. (Author)

Descriptors :   (*PIEZOELECTRIC CRYSTALS, RAYLEIGH WAVES), LITHIUM COMPOUNDS, NIOBATES, CADMIUM SULFIDES, SCATTERING

Subject Categories : Acoustics
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE