Newly developed measuring method of high-power characteristics of piezoelectric transducer constants including dielectric loss

Abstract

DieleCtriC loss in a piezoelectriC CeramiC transducer is concerned with the vibration, and inCreases remarkably under the high-power operation even in a so-Called hard PZT. When ordinary hard WI ceramics is used over the vibrational velocity of about 0.25 (mIs), the theletriC loss becomes larger than the mechaniCal vibration loss. In the paper, a new advanCed measurement method for obtaining simultaneously both the mechanical loss and the dielectric loss of the piezoeleCtriC ceramic transduCer under high-power operation is described. At the resonance frequency, the dielectric loss and the mechanical vibration loss can be separately and simultaneously measured. In the study, some experimental results have been obtained and evaluated with respect to the accuracy. These results are very useful for the precise design of the piezoelectric power devices.