星载激光测距仪扩束系统的高精度装调

星载激光测距仪扩束系统为无焦系统,对光学装调有着苛刻的要求,装调精度是决定激光测距仪工作能力的关键因素。利用计算机辅助装调技术,确定光学系统对光学元件的敏感度和补偿调整参量。针对镜间距影响该系统性能参数的特点,提出采用高精度三坐标测量技术和双光路定心技术对扩束系统装调。最后,采用 1 064 nm干涉仪对光学系统像质进行测试,使用套孔法对束散角进行测量。测试结果表明:该星载激光测距仪扩束系统RMS优于0.225,束散角为0.41 mrad,满足设计要求。

High accuracy alignment of beam expender of a space-borne laser range finder

The beam expender of a space-borne laser range finder was an afocal telescope, the alignment requirement of which was rigorous. The alignment accuracy was the key factor of the capability of the laser range finder. The sensitivity of optical element and the compensator were obtained by means of computer aided alignment. High precision coordinate measuring and dual-path centering technology were presented, being aimed at the characteristic of performance parameter determined by distance of elements. Finally the wavefront of the system was tested by the 1 064 nm interferometer, the divergence angle was tested using a pin-hole. The result demonstrates that the RMS of the system is better than 0.225 and the divergence angle is 0.41 mrad. The results meet the requirement of design.