自由空间光通信ATP系统中精瞄偏转镜的设计

二维精瞄偏转镜是自由空间光通信中捕获、跟踪和瞄准(ATP)系统的关键组成部分,对偏转镜进行了机构设计和有限元模态分析,偏转镜采用压电陶瓷驱动器驱动,采用柔性铰链传动。研制了集驱动、检测、主控模块为一体的数字式精密定位控制器,在实验室构建了两套测试系统,对偏转镜的频率和静态性能进行了测试,并着重介绍了频率的两种测量方法及其优缺点分析。仿真和测试结果表明,偏转镜的频率约为1.5 kHz,转角范围约为±2 mrad,精度约为1 μrad,分辨率约为0.1 μrad。

Design of fine pointing tip / tilt mirror of ATP system for free space optical communication

The two-dimensional fine pointing tip/tilt minor is a key component of the acquisition, tracking and pointing(ATP) system for free space optical communication. The mechanical design and model analysis was made to the tip/tilt mirror driven by the piezoelectric actuator and transmitted by the flexure hinge. The digital precise position controller was developed, which consisted of driving module, measuring module and control module. The test system was developed in laboratory, and the frequency and static performance of tip/tilt mirror were tested. Two measuring methods of the frequency were particularly introduced. The testing results indicate that the frequency of the tip/tilt mirror is about 1.5 kHz, the rational degree range is about ±2 mrad, the precision is about 1 μrad and the resolution is about 0.1 μrad.