采用光束扫描的透射仪测量光路自动准直系统

能见度是航空、航海及其他领域关系到安全保障的重要气象要素之一，透射式能见度仪在安装和使用过程中测量光路的准直状态，对能见度测量精度有重要影响。根据其光学系统的特点提出了一种基于扫描方式的透射仪测量光路自动准直方法，并基于该方法设计了自动准直系统。系统通过电机驱动发射端探测光束与接收端接收视场分别在两个垂直方向上进行扫描，计算发射端与接收端的准直方位角，进而实现透射仪测量光路的对准。系统测试表明，系统可以实现透射仪测量光路的自动对准，方位角定位最大误差为66rad，准直时间小于10 min，系统具有准直精度高、过程自动化、易于安装等特点。

Automatic alignment system for measuring optical path of transmittance meter using light beam scanning

Visibility was regarded as one of the most important meteorological complications affecting the safety in the field of aviation and navigation. The alignment status of transmittance meter has played an important influence on the accuracy of visibility measurement in the course of installation and application. A measuring light path alignment method based on scanning mode was proposed and the automatic alignment system was designed based on this method. The system drove the probe beam and received field of view scanning in two vertical directions by electric machinery, then the azimuth angle of the transmitter and the receiver was calculated, and the alignment of the optical path was realized. System test shows that the system could realize the automatic alignment of the optical path of the transmittance meter, the maximum error of azimuth position is 66rad, alignment time is less than 10 min. The system has the characteristics of high collimation precision, process automation, easy installation and so on.