Accession Number:

ADA010728

Title:

Acoustic Generation by Nonuniform Polarization in Ferroelectric Ceramics.

Descriptive Note:

Technical rept.,

Corporate Author:

ILLINOIS UNIV URBANA COORDINATED SCIENCE LAB

Personal Author(s):

Report Date:

1975-05-01

Pagination or Media Count:

147.0

Abstract:

The thesis is a study of acoustic generation by the interaction of a uniform a-c electric field and a nonuniform polarization in a ferroelectric ceramic plate. The nonuniform polarization is induced by the temporary application of a strong d-c electric field to an interdigital transducer deposited on the surface of an unpolarized ferroelectric ceramic plate. The effect of the polarization is described in terms of a spatially variant tensor containing the effective local values of the piezoelectric constants. This previously unpublished concept is applied to modified equations of motion for the isotropic elastic plate. Expressions are obtained for the resonant mode frequencies, excitation bandwidths and relative power levels. Experimental data are taken in the form of input impedance and delay line insertion loss versus frequency. Theoretical and experimental data are compared and found to be in good qualitative agreement.

Subject Categories:

  • Line, Surface and Bulk Acoustic Wave Devices
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE