Simulation research of a self-focusing spherical ultrasonic transducer

This paper studies the calculation of acoustic pressure for self-focusing spherical ultrasonic transducer. By way of physical acoustics method, the integral expression of acoustic pressure for self-focusing spherical ultrasonic transducer is deduced in the combined coordinate system which contains spherical coordinate system and cylindrical coordinate system, and then the integral expression is simulated through numerical analysis method. At last, experiments are conducted to verify the correctness of the theoretical simulation, and the experimental data accord with the theoretical simulation, which lay the foundation for correct estimation of the acoustic field as well as temperature field distribution and establishment of the proper tissue heat transfer model.