基于积分球分光与接收的透射式能见度测量系统

介绍了一种新型透射式能见度测量系统，积分球在光源能量监控和光信号接收中起到重要作用。光源采用白色LED，外部高频脉冲调制，信号测量端同步解调，有效消除外界光干扰。积分球分光实时监控光源发射能量的变化，消除光源自身不稳定带来的误差。准直和扩束透镜组将光源发散角控制在1 mrad。反射镜组反射光路实现了有限空间光程的增加，同时增加了采样体积，缩短了透射系统的安装基线。积分球配合望远镜接收光束减小了光路调节的压力。系统研制完成后开展了实验室内模拟能见度测量实验，与现有测量大气散射系数的设备积分浊度计进行对比分析，通过积分浊度计传递定标参数。结果表明:两个系统在1.7~20 km测试区间相对偏差小于4%。

Transmission measurement system for visibility based on integrating sphere applied to light splitting and receiving

A new transmission visibility measurement system was introduced. Integrating sphere played an important role in monitoring and receiving light. The white LED light source in this system was modulated by external high frequency pulse signal and demodulated in receiver, which would effectively detach the interference by stray light. Integrating sphere was applied to monitor variation of the light source, which can eliminate the error caused by the instability of light source. The collimation lens and beam expanding lens group makes divergence angle in 1 mrad. The high reflection mirrors increase the optical path in the limited space, which also increases the volume of sample and shorten the baseline of transmission system. Adjusting optical path becomes easy by telescope and integrating sphere. After completion of the system, comparison experiment was made with nephelometer. The result shows that the relative deviation between two systems is less than 4% from 1.7 km to 20 km.