LAMOST高精度光纤定位单元关键技术研究

Research of Key Technique of High Precision Positioning Unit for LAMOST

基于 L AMOST并行可控式光纤定位系统 ,介绍了双回转光纤定位单元实现高精度定位的关键技术。定位单元采用了基于计算机数据端口的开环控制系统 ,设置机械零位辅以电子开关构成单元回转的基准零位以减小多次重定位的累积误差 ,采用弹簧消隙机构消除齿侧间隙提高系统定位的稳定性。单元采用面阵 CCD传感器检测单元定位精度 ,通过检测光纤端部出射光斑的特征点以表征定位单元上光纤端部位置。实验表明本定位单元能够实现光纤的快速、高精度定位 ,定位精度达到40 μm。

Based on parallel controllable optical fiber positioning for LAMOST, the key technique of high precision positioning unit based on double revolving device unit is presented. The data port of parallel port constitutes the intelligent controller of stepper motor. The system sets mechanical zero based on electron switch as the reference zero of the revolving unit to reduce the accumulate error of multi positioning. The system uses spring mechanism to eliminate the gear clearance, to improve its stability. The unit uses matrix CCD to characterize the position of the end of the optical fiber of the fiber unit by measuring the position of light spot from the end of the optical fiber. Experiments show that the positioning unit can position the fiber quickly and precisely. Its precision is 40μm.