Characterization and Modeling Simulation of the Acoustic Field Generated by Spherical Focused Ultrasonic Transducers

Spherical focused ultrasound transducers have high-frequency characteristics and are widely used in high-energy ultrasound focused power sources.The important factors that affect the energy density of the acoustic field are the frequency and amplitude of the transducer.For spherical focusing transducer, control the transducer power to a certain value, and change the transducer frequencies to 0.5Mpa, 1Mpa, 1.5Mpa, 2Mpa, 2.5Mpa respectively through the COMSOL Multiphysics pressure acoustic frequency domain simulation, so as to obtain the coefficient related to the characteristics of the acoustic propagation medium in the acoustic Attenuation coefficient, and prove that it is mainly related to the transducer frequency.To change the amplitude of the transducer, it is necessary to adjust the transducer power. However, the theory in this regard is still incomplete.To solve this problem, a mathematical model is proposed to calculate the amplitude value of the transducer by adjusting the transducer power. This mathematical model is combined with the sound pressure formula at the focal point of the spherical focused transducer, and the theoretical calculation values of the sound pressure are compared with the simulation results. The error is less than 5%, forming a systematic mathematical model of the sound pressure field.