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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。
In order to optimize the phased array acoustic field quickly and efficiently, the pseudo-inverse algorithm is simplified. Through the amplitude and phase compensation of the sound pressure of the controlled point, an approximate sound pressure weighting formula is obtained. This formula is used to preset the sound pressure level of the controlled point. Then the amplitude and phase of each array element are determined by the improved pseudo-inverse matrix algorithm, so as to obtain a direct multi-focal sound field synthesis mode. A planar phased array composed of 16 × 16 square elements is designed based on this synthesis mode. The synthesis of multifocal acoustic field is numerically simulated. The results show that this method can improve the deposition ability of acoustic energy at the target point and has high sound field synthesis efficiency, which provides an effective approach for acoustic focus control in ultrasound hyperthermia.