Laser probe measurements of material properties and elastic vibration distributions in counterpoled ceramics

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Abstract
A number of specialized ceramic transducer structures using the principle of counterpoling (or reverse poling) have been described in the literature, e.g., Fresnel zone plate focused transducers1 and surface acoustic wave transducers.2 For these devices, a uniformly poled piece of ceramic is reverse poled in certain regions in order to effect a desires spatial pattern of reversed piezoelectric coupling. This paper describes the use of a laser probe for determining the spatial distributions of polarization, strain and elastic vibration amplitude in non-uniformly poled ceramics by simultaneously measuring the pyroelectric response, the surface distortion and the mechanical surface displacement.