Temperature-Dependent Performance of Acoustic Power Transfer Through Metal

We analyze the effect of temperature on piezoelectric 1-3 composite transducers and their performance in acoustic power transfer through metal at elevated temperatures. Using the resonance analysis in thickness extension mode, we determined temperature-dependent piezoelectric, elastic, and dielectric material coefficients, along with the corresponding electromechanical coupling factor. The dielectric coefficient increased with temperature, while the elastic stiffness and the piezoelectric coefficient decreased with a rise in temperature. Further, we observed thermal hysteresis in all the material parameters over temperature cycles.Subsequently, we investigated the suitability of 1-3 composite piezoelectric transducers for acoustic power transfer at elevated temperatures. Our power transfer system used a 20 mm thick Aluminium wall as a transmitting medium and a pair of transducers glued coaxially to either side for generating and receiving acoustic waves. Results indicate that the efficiency of the acoustic power transfer system is strongly temperature-dependent, exhibiting a decrease with rising temperatures.