真空环境下激光测距仪收发光轴测试方法研究

为了避免资源卫星激光测距仪地面真空收发光轴一致性测试过程中损伤雪崩光电二极管(APD)，采用一种新的适用于真空环境下测试方法，通过平行光管和激光光束分析仪建立测试系统，穿舱密封光缆连接器引入罐外的1064nm连续光源，在接收机焦面位置设计光纤匀光器，产生发散的均匀分布的照明光束，引出接收机视轴，多级衰减引出发射机光轴，对资源卫星激光测距仪真空下不同工况性能进行了实验验证。结果表明，此方法消除了真空环境下APD损伤风险，测量精度优于6.47μrad，满足激光测距仪的测试精度要求。该研究具有结构紧凑、测试链路少、测试精度高的优点，为高能激光测距仪真空测试提供了新思路，具有广泛的应用前景。

Measurement method research of the receiver and transmitter axis of laser altimeter in vacuum environment

In order to avoid damage avalanche photodiode(APD)during the the receiver and transmitter axis testing process of ZY-satellite laser altimeter, a new test method suitable for vacuum environment was proposed. The test system was established through the collimator and laser beam analyzer, and the optical cable connector was sealed through the cabin, a 1064nm continuous light source outside the tank was connected to a designed fiber-optic homogenizer, which was fixed on the focal plane of receiver to produce a uniformly illumination beam and get the optical axis of the receiver. The optical axis of the transmitter was got by multi-stage attenuation. The results show that the method eliminates the risk of APD damage in vacuum environment, and the measure accuracy is better than 6.47μrad, which meets the requirements of laser altimeter. The method has the advantages of compact structure and high precision. It provided a new idea for vacuum test of high energy laser rangefinder and has a wide application prospects.