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1-3 piezoelectric composite has been widely used in underwater acoustic and ultrasonic transducer, and its thickness vibration mode is most commonly used by transducer. The resonance frequency and the conductance are two key parameters of this mode, because they determine the working frequency of transducer and electrical match, respectively. In order to characterize these parameters, the electromechanical equivalent model of thickness vibration mode was established to obtain the admittance equation, and then the key parameters were calculated. Meanwhile, 1-3 piezoelectric composite samples with different structural parameters were prepared and tested, and the theoretical model was verified. Finally, the theoretical model was used to characterize the variation of resonance frequency and conductance with the structural parameters to guide the design of 1-3 piezoelectric composite.

Characterization for the key parameters of 1-3 piezoelectric composite in thickness vibration mode