说明：  主要由脉冲半导体激光二极管发射电路、光学元件、漫反射物体、接收系统、高精度时间转换芯片TDC．GP2、单片机构成，激光发射电路打出窄脉宽光脉冲，同时将发射脉冲输入到TDC．GP2的START端口，触发时差测量。
(Mainly by the pulsed semiconductor laser diode emitting circuit, optical element, diffuse objects, receiving high precision system, time conversion chip TDC.GP2 and single chip microcomputer, laser emitting circuit play narrow width pulse, while the transmitted pulse is input to the TDC.GP2 START port, triggering time difference measurement.)