sound field simulation platform of HIFU treatment

Single-array sound field calculation model

In the structural design of the ultrasonic hifu piezoelectric crystal, the approximate calculation method of the sound field can quickly predict the sound field of the probe, especially for observation points located at the far field; in addition to accurate and complex finite element calculations method, the approximate calculation method of sound field can enable researchers to more clearly observe the key to affect the distribution of sound field.which are very helpful for design probe . Far from field sound for sinusoidal signal excitation.Analysis is a commonly used approximate calculation method. It is a numerical solution to approximate the sound pressure of a resonant frequency HIFU piezoelectric in the far field.This method is also the theoretical basis for the establishment of the array sound field calculation model. The party will be described in detail below.The principle of solving the law. The picture shows the spatial sound field model of a single element.

First, introduce the constraints of the high intensity focused piezo,

(1) The observation point is in the far field space point of the sound source S;
(2) The sound source S is a planar array element whose main vibration mode is parallel to the positive direction of the Z axis;
(3) The excitation signal of the array element is a single-frequency sinusoidal signal;
(4) The sound field of the planar sound source S is equivalent to the result of the sound field of its surface panel;
(5) The transmission medium of Hifu piezo transducer speaker is an infinitely large, uniform waveguide with acoustic attenuation characteristics.