NEW METHOD FOR MEASURING MECHANICAL VIBRATION LOSS AND DIELECTRIC LOSS OF PIEZOELECTRIC TRANSDUCER UNDER HIGH-POWER EXCITATION

In the Pb(Zr, Ti)03 group ceramics, the dielectric loss becomes larger than the mechanical vibration loss under high-power excitation. In this paper, a new advanced method for measuring these losses separately and simultaneously is described. The two-step differential circuit is utilized. By adjusting the differential circuits, the dielectric loss and the damped capacitance are obtained. The resonance circuit constants under high-power excitation are obtained after adjusting the differential circuit.