说明：  测量提供的脉冲式超声波发射电路线路板，并用电路软件绘制出电路原理图。分析电路的工作原理，安装调试电路，结合探头发射出超声波信号。
(Measurements provide pulsed ultrasonic transmitter circuit board and draw a circuit diagram of the circuit software. Working principle analysis of the circuit, the circuit installation, combined with the probe emits ultrasonic signals.)