摘要
相控阵超声探头可实现电子聚焦和电子扫描,具有重要的应用价值。本文从点声源在空间的声场分布公式着手,依次推导了矩形声源、矩形线阵声源、相控阵声源的远场声场二维分布公式,用数值计算仿真研究了确定各声场的二维分布,并绘制了各声场在xoz平面内和x方向声强分布图,发现线阵的声束受单个阵元声场的调制,通过延迟阵元间施加激励的时间可使声束发生偏转,但同时也会降低主瓣的最大值并增加旁瓣数。
Phased array transducers are very attractive because the beam generated by the arrays can be electronically focused and steered. The present work characterizes far-field 2D properties of phased array system by functions that are deduced from rectangle source, rectangle line array and phased array based on point source. Results are presented for the distribution of ultrasound intensity on plane xoz and on x-axis by simulation using numerical calculation. It is shown that the shape of response of rectangle line array is modulated by the single array element. It is also demon- strated that the delay time of phased array is the key to steer the beam, sacrificing the value of main lobe and increas- ing the number of side lobes.
出处
《生物医学工程学杂志》
EI
CAS
CSCD
北大核心
2012年第5期846-850,共5页
Journal of Biomedical Engineering
基金
川北医学院苗圃基金资助项目(MP-ZK-37)
关键词
相控阵
超声
声场
建模
Phased array Ultrasound Sound filed Modeling
