双门选超声波收发模拟电路的设计

Design of Double-gated Ultrasonic Analog Circuits

针对现有模拟板中存在冗余的电容导致建波信号拖尾较长,致使超声信号经模拟板处理后分辨率低的问题,提出了一种以差分接收、双门选回波处理硬件电路设计。在检波放大之前设计一个门选电路,直接从全波信号中选取缺陷信号,避免了界面波经过检波放大电路后,形成拖尾淹没缺陷信号,提高了接收电路信号的可靠性。文中从硬件方面介绍了接收电路的调整。实验表明,电路性能稳定、精度高、成本低,并具有良好的应用前景。

A hardware circuit design characterized by differential-receiving,double-gated and peak-keeping is proposed for the long tail of detection signals and the low resolution of ultrasonic signals caused by redundancy capacitors existing in the analog board. Flaw signals are selected from the full-wave signal by designing a gate-select circuit in front of the detecting circuit to remove the tail of detection signal effectively and improve the reliability of ultrasonic signal. This article introduces the adjustment of receiving circuit in terms of hardware. The experiment shows the system has stable performance,high precision,and large range,and with a broad application prospect.