A synthesis pattern of acoustic field produced by phased array based on the direct weighting of the controlled acoustic pressure

To optimize the acoustic field produced by phased array effectively and quickly, the pseudo-inverse method proposed previously is simplified. An approximate weight formula of acoustic pressure using a method of compensation to the amplitude and phase of the controlled acoustic pressure is presented in this paper. A multiple-focus field patterns based on the pseudo-inverse matrix algorithm can be obtained by presetting the value of the controlled acoustic pressure. A phased array comprised of 16x 16 square elements is used for numerical simulation. The results show that the sound energy can be effectively deposited at the desired points, and the acoustic field can be synthesized quickly using the direct weight formula of the acoustic pressure. This study may offer an effective way for controlling the distribution of acoustic field in ultrasound hyperthermia.