Abstract
Finite element computation of piezoelectric transducers requires the knowledge of elastic, piezoelectric, and dielectric coefficients of ceramics. These constants are generally not available from the manufacturer, and even, variations up to 20% can be expected in the worse cases. The classical experimental method, proposed by Mason, is based on admittance measurements and a complete determination of all the materials properties requires five resonator geometries. An interesting method, based on an adjustment of first modes of ceramic rings with a finite element code, is described. It has three advantages over the Mason method. First, it does not require particular resonator geometries; second, the experimental method is summed up on a simple impedance measurement of the whole ceramics; and third, the adjustment is unaffected by local nonhomogeneity of materials. In this paper, the whole method is developed. Then experimental and numerical results are compared for several ceramics.
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