摘要
一对多激光通信天线受结构和尺寸的限制,反射镜与安装平面只能单独研磨。虽然可根据面形测试结果对安装平面进行反复研磨,以保证摆镜安装后的面形精度,但该方法难度大、周期长、成功率低。为了减小加工难度,在保证正常研磨精度(5μm)的同时降低安装面平面度造成的安装应力和温度变形等外力影响,保证摆镜安装后的面形精度。研究了摆镜在力学作用下的面形精度变化和面形稳定性,优化设计了隔离结构,有效提高了摆镜的面形稳定性。测试结果表明,在测试波长为λ时,安装应力和温度升(降)载荷作用下摆镜面形精度的峰谷值由0.546λ提升到0.161λ,均方根值由0.099λ提升到0.019λ,完全符合设计要求。
Objective In the one-to-many laser communication indoor principle verification system,the antenna adopts multifaceted tilt-mirror with independent optical axis alignment function to realize one point and multi-point laser communication in a broad range.To reduce the size and working envelope of the tilt-mirror in the laser communication ground test system to meet the limitation for size,a compact and integrated tilt-mirror with SiC/Al is proposed in this paper.The tilt-mirror can be connected to the turntable’s pitch axis seat to reduce the reflecting surface’s eccentric distance and the whole machine’s outer envelope size.The tilt-mirror and supporting structure’s mounting surface can only be separately grinded and then installed since the structure restrict the system.The test shows that when the grinding accuracy is 5μm,the tilt-mirror profile accuracy cannot meet the design requirements.The mounting surface must also be repaired by grinding several times according to the surface inspection results after the tilt-mirror is installed.However,the system has three independent tilt-mirrors,which makes the repair grinding cycle long and complicated.Thus,the tilt-mirror must be optimized to consider the impact of grinding errors on the surface quality and reduce the requirements for the surface quality of the mounting surface.This study focuses on the tracking tilt-mirror structure in the networked laser communication ground demonstration prototype,which causes the reflector and mounting base unable to use the traditional bonding process and can only be installed with screws,resulting in serious degradation of the reflector surface during the screw connection process.Theoretical and simulation analyses are conducted to verify the reasons and laws of the problem based on the original structure’s test results.It then optimized the design to improve the mirror surface’s stability,ensuring that the design requirements are met.Methods First,the initial design mirror’s surface shape changes under different
作者
李小明
王隆铭
李响
张立中
张家齐
Li Xiaoming;Wang Longming;Li Xiang;Zhang Lizhong;Zhang Jiaqi(National and Local Joint Engineering Research Center of Space Optoelectronics Technology,Changchun University of Science and Technology,Changchun Jilin 130022,China;College of Mechanical and Electrical Engineering,Changchun University of Science and Technology,Changchun,Jilin 130022,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2021年第1期136-144,共9页
Chinese Journal of Lasers
基金
国家自然科学基金重大研究计划(91338116)。
关键词
激光通信
摆镜
优化设计
面形精度
laser communications
tilt-mirror
optimization design
surface quality
