一种用于相控阵B超成像的数字波束合成器的设计

本文介绍了一种能沿任意波束指向全程动态聚焦的数字波束合成器的设计，此合成器用于相控阵Ｂ超成像系统。回声信号的延时量分解为“指向延时”和“聚焦延时”两部分，分别用产生相控发射激励的时序逻辑电路和一个“动态聚焦延时量表”实现。通过对Ａ／Ｄ采样时钟的控制及对Ａ／Ｄ采样时钟、地址计数时钟和存储器写时钟的时序配合，实现了同相位数据点采样及无冗余数据的缓冲存储器。所设计的数字相控波束合成器只用廉价的高速数字电路即可实现，成本极低。实验结果验证了该方案的可行性。

A digital beamformer for phased array ultrasonic imaging

In this paper a digital beamforming technique for phased-array ultrasonic imaging equipment is proposed. In this beamformer, dynamic ultrasonic beam focusing along any steering direction can be achieved. Delay time for the received signal at each of the array elements is decomposed into two parts.One is accomplished by the same logic circuit to generate the transmitting pulse,the other is accomplished by using a "dynamic focusing delay time table).By coordinating the sampling chock,the addressing logic and the memory write operation, each sampled data is the necessary one for bearnforming, so that the buffer memory has no redundant data in it.The resulting electronic circuitry is simple and inexpensive.Preliminary experiment results show that the technique proposed is practical.