Ball crown of high intensity focused ultrasound transducer

The following figure shows the time peak of sound pressure obtained after the spherical crown model array A is deflected by different distances in the positive direction of the X axis.Where a and e, b and f, C and g, d and respectively are the HIFU piezo ceramics deflected by 0 mm in the positive direction of the X axis,The sound field distribution on the XOY focal plane and the xoz focal plane obtained the 4mm, 6mm, and 9mm. The origin is the geometric center point of the array. The peak time of sound pressure is represented by the contours of the five different colors is 0.1 0.3 0.4 0.5 QgPmax, as is indicated by the arrows in the figure.which is an isometric distribution diagram of the time peak sound pressure obtained by the rectangular model array B, which is deflected by the 0 mm, 4 mm, 6 mm, and 9 mm distances in the positive direction of the X-axis. By comparing the two figures, it can be found that the acoustic energy focusing effect of array A is better than that of rectangular array B, which is expressed as follows: at the same deflection distance and the same focal plane, the highest grating lobe intensity ratio of array A is small, such as the forward deflection of 6mm HIFU piezoelectric sensor along the x-axis, the highest grating intensity of array A is only 0.IPmax.

Quantitative analysis of the sound field of the spherical crown array C and the spherical crown array D in a single point focusing mode are different array structures. It is sound field quantization level, detailed definition of level, in this chapter, we propose a new type of ultrasonic high focus piezoelectric ceramics of ultrasound array structure model, that is, using a limited regular hexagonal piezoelectric ceramic through the spherical crown. The arrangement of the array elements is arranged on the spherical surface of the sphere, and a spherical crown ultrasonic array model with self-focusing effect and electronic deflection focusing is obtained. The array structure model can achieve high filling efficiency of array elements.