文中介绍的能见度测量系统,通过测量0.81μm激光光束在前向30°方向的散射能及在直射方向的透射能,计算大气的散射系数,测量了能见度.该系统包括光学发射与接收、信号放大与处理及结果显示三部分.光学发射与接收部分主要由半导体激光器、准直镜、扩束镜、接收镜、截止滤光片、窄带干涉滤光片、PIN光电管等组成;信号放大与处理部分主要由电压跟随放大电路、采样保持电路、多路模拟开关电路、模-数转换电路、8031单片机等组成;结果显示部分主要由显示器、打印设备、输出端口等组成.简述了该系?车墓ぷ髟砑盎窘峁?对测量的稳定性、测量精度以及光、电干扰的抑制等技术难点进行了讨论,并给出相应的解决方案.

In this paper, a crossing dual-light-path laser detection system for visibility by forward-scattering is presented. The measurements of visibility and scatter coefficient are realized through measuring scatter energy in forward 30° direction and transmission energy in straight direction for a 0.81μm laser. The system consists of three parts: optical emitting and receiving system, signal amplifying and controlling system, and displaying system. The optical emitting and receiving system mainly consists of laser diode, collimating lens, extending lens, receiving lens, cut-off filter, narrow band interference filter, and Si-PIN photodiode. The signal amplifying and controlling system mainly consists of voltage amplifier, sample/hold circuit, muti-channel analog switch, A/D converter, and 8031 single chip processor. The display system mainly consists of indicator and printer. The principle and configuration of the system are introduced. At last, the key technologies about stability, precision and optical-electronic interference in the process of measurement are discussed.The solution is proposed.