Nonlinear Behavior of Transducer Ceramics.
NAVAL UNDERWATER SYSTEMS CENTER NEWPORT R I
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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 andor 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
- Ceramics, Refractories and Glass
- Test Facilities, Equipment and Methods
- Acoustic Detection and Detectors