二维宽带超声换能器相控阵列的脉冲场计算

Computation for Pulsed Sound Field of Wide Band Two-Dimensional Transducer Array

讨论了单阵元声场脉冲响应函数的快速近似算法 ,通过对不同延时量的矩形单阵元声场脉冲响应函数进行叠加 ,得到了二维换能器阵列的发射和接收脉冲响应函数 ,再施加以宽带脉冲激励函数 ,从而得到二维换能器阵列的声场分布 .计算了 6 5× 6 5正方形阵列的声束分布 ,并比较了 3种不同结构的二维换能器阵列接收声束的波瓣尺寸 .对宽带二维换能器阵列声场分布和波束控制方法的仿真结果表明 ,该方法对医学超声成像用的换能器参数优化设计具有重要意义 .

Transmitting and receiving impulse response of two dimensional array are obtained by the summing impulse response of a single rectangular element with differentia delay time. The approximation arithmetic of array element impulse response is discussed. Output signal of two dimensional wide band array is equal to convolution of transmitting and receiving impulse functions with wide band pulse input signal. Sound field distribution of array with 65×65 element is calculated. Comparation of sound field of three kinds array are examined. The results can be used to optimization of two dimendsional transducer parameter for ultrasound imaging.