Finite element analysis of ultrasonic spherical piezoelectric phased array with split electrodes

The paper considers a focusing piezoelectric transducer in the form of a spherical segment with technological hole in the center and with separated electrodes. This transducer is designed to generate high-intensity ultrasonic fields with controllable characteristics in the focal spot in the external acoustic medium. In order to enhance the efficiency of the acoustic wave excitation, porous piezoceramics is suggested as an active material for the transducer. The simulation of the working process for piezoelectric transducers was done with the use of multiscale finite element technologies in computational package ANSYS. On the results of calculations, it was concluded that the multi-electrode coating allows controlling the characteristics of the focal area at the working acoustic medium and, thus, improve the efficiency of the transducer with a powerful ultrasound.