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经纬仪调焦系统分为两大部份:一是光学机械部分;二是电控部分。调焦机构的光学机械部分采用直线运动精密定位系统,用镜筒自身做向导,精密微动丝杠传动。主要由准直镜,精密丝杠,减速箱,电位计等组成,实现距离和温度的调焦。现在应用的调焦系统电控部分的核心控制器采用80C196KB单片机,辅助以接口电路、功率驱动电路等。目前由单片机构成调焦系统调整一对放置在望远镜光路中的准直镜,移动其中一块来改变空间光程,达到调整目标像点使其与主焦面重合的目的。主控计算机通过RS422方式把距离信息发送给单片机,单片机通过串口读取该距离信息。单片机通过读取电位计的值来确定准直镜的当前位置,通过与给定的位置进行比较来确定准直镜的移动量。自动调焦系统利用精密线绕电位计检测准直镜当前位置。
Theodolite focusing system is divided into two parts: First, optical machinery part; second is the electric control part. Focusing mechanism of optical mechanical parts using linear motion precision positioning system, with the lens barrel to do their own guide, precision micro-screw drive. Mainly by the collimator, precision screw, gear box, potentiometer and other components, to achieve distance and temperature focus. Now the focus of the focus control system using the core part of the controller 80C196KB microcontroller, auxiliary interface circuit, the power drive circuit. At present, a single-chip focusing mechanism is used to adjust a pair of collimating mirrors placed in the optical path of the telescope, and one of the collimating mirrors is moved to change the spatial optical path so as to achieve the purpose of adjusting the target point so as to be coincident with the main focal plane. The host computer sends the distance information to the one-chip computer through RS422 way, the one-chip computer reads the distance information through the serial port. Microcontroller by reading the value of the potentiometer to determine the collimator’s current position, by comparing with the given position to determine the amount of collimator movement. Automatic focusing system uses precision wirewound potentiometer detection collimator current position.