摘要
为快速高效地对相控阵声场进行优化,对伪逆算法进行了简化。通过对被控点声压进行幅值和相位补偿,得到了一个近似的声压加权公式。应用该公式预设被控点声压值,然后运用改进的伪逆矩阵算法确定相控阵各阵元的振幅和相位,从而得到一个直接的多焦点声场合成模式。基于该合成模式设计了一16×16个正方形阵元构成的平面相控阵,并对多焦点声场的合成进行了数值仿真。结果表明,该方法可提高声能在目标点的沉积能力,具有较高的声场合成效率,为超声热疗中声聚焦控制提供了一条有效的途径。
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.
出处
《声学学报》
EI
CSCD
北大核心
2011年第6期626-630,共5页
Acta Acustica
基金
国家自然科学基金(111744077)
湖南省自然科学基金(11JJ3079)
湖南省教育厅科技基金(10C1163)资助项目
