Accession Number : AD0748198

Title :   Nonlinear Behavior of Transducer Ceramics.

Descriptive Note : Research rept.,

Corporate Author : NAVAL UNDERWATER SYSTEMS CENTER NEWPORT R I

Personal Author(s) : LeBlanc,Charles L.

Report Date : 18 AUG 1972

Pagination or Media Count : 52

Abstract : A compilation of the nonlinear characteristics of polarized ferroelectric ceramics in environmental conditions representative of operational situations is presented. The effects of high alternating electric fields, large static and/or dynamic stresses, and combinations of field and stress on the electromechanical parameters of several ceramic compositions are discussed. Primary emphasis is placed on variations in the free permittivity and the dielectric-loss tangent with respect to low-frequency, high-field phenomena. In the static-stress investigations, the basic parameters monitored were the permittivity and electromechanical coupling coefficient of projector materials and the piezoelectric stress and strain coefficients of receiver (hydrophone) materials. Comments concerning dynamic nonlinearities are limited to projector materials and directed at interpreting the loss mechanisms associated with large dynamic stresses experienced by ceramic specimens about their fundamental resonance frequencies. (Author)

Descriptors :   (*PIEZOELECTRIC TRANSDUCERS, *CERAMIC MATERIALS), LEAD COMPOUNDS, ZIRCONATES, TITANATES, ELECTRIC FIELDS, PRESSURE, STRESSES, SONAR EQUIPMENT, HYDROPHONES, AGING(MATERIALS)

Subject Categories : Ceramics, Refractories and Glass
      Test Facilities, Equipment and Methods
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE