Conventional design for ultrasonic probes tends to favor piezoelectric materials with high electromechanical coupling coefficient. Since the probe performance extremely depends on parameters of the used piezoceramic materials, static and dynamic behaviors of PZT-5H piezoceramic mixture are investigated to assessing its fitness for the criteria of probe designation. The impedance of seven selected PZT-5H piezoceramic plates were analyzed theoretically and experimentally against frequency band of 7 MHz to generate extensive data on characteristics of such ceramics plates. Effect of mechanical and dielectric losses on such impedance was also examined. This may be achieved by introducing the complex constant. Variation of impedances, which represented in circuit model, and the resultant lumped component of equivalent circuit may interpreted the loss mechanisms of such materials that greatly impact a probe's efficiency, maximum drive–level and resonant characteristics.
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