Design of a Lens-focused Transducer Based on 1-3 Piezoelectric Composites

To suppress the multi-mode coupling effect and improve the electro-acoustic conversion efficiency of a lens-focused transducer made of the piezoelectric ceramic material,a novel lens-focused transducer using 1-3 piezoelectric composites is designed in this work.First,the thickness resonant frequency ft and thickness electro-mechanical coupling coefficient kt of the 1-3 piezoelectric composites were calculated and simulated,the difference between the theoretical value and the simulation value for ft and kt are 2.947% and 0.933% respectively.Next,the vibration condition of the transducer was analyzed.At the resonant frequency ft of the transducer,the displacement amplitude at radial direction of the acoustic lens center is only 7.9% of the thickness direction,which shows that the radial vibration has been suppressed effectively,and thus the electro-acoustic conversion efficiency of transducer has been improved.This study could be used as reference in the development work on focused transducers.