Development of a High Power Piezoelectric Characterization System and Its Application for Resonance/Antiresonance Mode Characterization

Abstract

We developed a new high power piezoelectric characterization system, and report its application for characterizing the resonance and antiresonance vibration performance in this paper. Although the traditional constant voltage measurement was improved by using a constant current measurement method, the conventional technique was still limited to the vicinity of the resonance. In order to identify a full set of high power electromechanical coupling parameters and the loss factors of a piezoelectric, both resonance and antiresonance vibration performance should be precisely measured simultaneously. However, the high power characterization across antiresonance has not been addressed previously in the literature. Our new high power characterization system reported here is capable of measuring the impedance/admittance curves by keeping the following various conditions: (1) constant voltage, (2) constant current, (3) constant vibration velocity of a piezoelectric sample, and (4) constant input power. In addition, the system is equipped with an infrared image sensor to monitor the heat generation distributed in the test sample. We demonstrated the usefulness of the new system in a rectangular piezoelectric plate in the whole frequency range including the resonance and antiresonance frequencies. The results clearly concluded that compared to the resonance mode, the antiresonance mode exhibits a higher mechanical quality factor Q M and the same vibration amplitude/velocity under a smaller input electrical power and lower heat generation. This may suggest a superiority of the antiresonance mode usage to the resonance mode from the high power application viewpoint (i.e., ultrasonic motors, transformers).

Applications of Lead-Free Piezoelectrics

“…The high-power property of the disk sample and the transformer characteristic were measured by a High-Power Characterization System (HiPoCS™) developed by our group [10]. An amplitude controlled sinusoidal signal was produced by a function generator (HP 33120A) and amplified by NF 4010.…”

Measuring the Amplitudes and Phases of Vibrations of Piezoceramic Structural Elements

“…to determine, by various methods, the components of admittance and the active (real) and reactive (imaginary) components of the material constants. There are no methods for the direct measurement of the active and reactive components of admittance; therefore, they have to be determined indirectly, i.e., calculated by various approximate formulas.The recent studies [28][29][30] show that the behavior of piezoelectric vibrators at high power strongly depends on the type of electric loading. The admittance-frequency response at voltage of constant amplitude is essentially nonlinear, including abrupt drops and jumps.…”

“…The admittance-frequency response at voltage of constant amplitude is essentially nonlinear, including abrupt drops and jumps. Such nonlinearity is absent if the current is of constant amplitude [30].The quest for ways to measure the electroelastic and viscoelastic coefficients of piezoelectric vibrators is still ongoing. A method for determining the Q-factor and piezoelectric modulus by differentiating the frequency-dependent active component of the admittance with respect to frequency is described in [5].…”

“…The recent studies [28][29][30] show that the behavior of piezoelectric vibrators at high power strongly depends on the type of electric loading. The admittance-frequency response at voltage of constant amplitude is essentially nonlinear, including abrupt drops and jumps.…”

“…The admittance-frequency response at voltage of constant amplitude is essentially nonlinear, including abrupt drops and jumps. Such nonlinearity is absent if the current is of constant amplitude [30].…”