High power characteristics at antiresonance frequency of piezoelectric transducers

Evaluation of the mechanical quality factor under high power conditions in piezoelectric ceramics from electrical power

“…Many piezoelectric transducers operate in high power conditions, thus causing the need to measure piezoelectric properties under such circumstances [1]. Typical characterization techniques use lower power measurements, so researchers have developed specialized methods to characterize high power properties [2][3][4].…”

An approach to design a high power piezoelectric ultrasonic transducer

“…Using this method, in investigating resonant frequency of sandwich transducers, it was observed that, as expected, resonant frequency is affected not only by physical and mechanical characteristic of elements and axial dimensions, but also by lateral dimensions and cross section of the transducer [7]. Hirase et al [8] have explained variation of high-power PZT transducer parameters and mechanical losses, in particular, in resonant and anti-resonant frequencies and they have consequently recommended tuning in antiresonant frequency for higher quality factor. According to Powell and Hayward's [9] findings at a Center for Ultrasonic Engineering in Strathclyde University in Scotland, acoustic power of transducer will increase by keeping the axial length constant and adding to the number of PZT rings used in the structure.…”

Alternately poled piezoelectric transformers using rectangular ceramic plates

“…Therefore, the upper limit of the drive power is defined by the temperature rise. Heat generation of piezoelectric ceramics was reported as a function of vibration speed [6,7]. The vibration velocity of the fabricated samples was measured, and the load dependence of the efficiency was evaluated for each sample.…”