大口径反射镜Bipod支撑结构的装调与检测方法  

Adjustment and testing method of large aperture mirror Bipod support structure

作　　者：李斌[1] 高思思 王海超[1] 陈佳夷[1] 陈西 陆玉婷[1] Li Bin;Gao Sisi;Wang Haichao;Chen Jiayi;Chen Xi;Lu Yuting(Beijing Institute of Space Mechanics&Electricity,Beijing 100086,China;Beijing Institute of Spacecraft System Engineering Laboratory,Beijing 100094,China)

机构地区：[1]北京空间机电研究所,北京100086 [2]北京空间飞行器总体设计部,北京100094

出　　处：《红外与激光工程》2024年第4期138-148,共11页Infrared and Laser Engineering

基　　金：国家重点研发计划项目(2022YFB3403800)。

摘　　要：随着我国遥感卫星对地观测分辨率的不断提升,空间遥感相机的有效口径逐步增大,为有效应对相机在地表装调时的重力误差干扰,大口径遥感相机的装调方式逐步从光轴水平形式转变为光轴竖直形式,与之对应的,相机主反射镜支撑结构与装配需求也在不断革新。为满足反射镜支撑与减重需求,在1 m及以上口径的反射镜支撑形式中,Bipod结构是较为常见的一种结构形式,不同于传统的框式支撑形式,它在光机结构粘接与结构位置标定需求上都有了巨大变革。为保证Bipod支撑结构下反射镜的装配定位精度和面形变化满足系统指标要求,提出了一种结合多目标空间位置转换和Stewart结构运动反演的大口径反射镜组件装调方法,该方法可在有效保证光机结构粘接点精度的同时,仅依靠反射镜自身支撑结构,实现反射镜与主承力板之间的高精度六维调节,系统装调误差可控制在0.04 mm左右。在遥感相机的实际装调过程中,通过分析主反射镜在系统中的装调误差区间,并以此为标准制定了反射镜Bipod结构的定位、粘接、调整和检测方案,实践结果表明该方法可有效控制反射镜的装配定位精度和面形误差,装调结果能够满足大口径遥感相机的系统成像需求。Objective In order to effectively deal with the interference of gravity error in the installation and adjustment of large aperture remote sensing camera on the surface,the installation and adjustment mode of large aperture remote sensing camera is gradually changed from the horizontal form of optical axis to the vertical form of optical axis.Correspondingly,the support structure and assembly requirements of the main mirror of the camera are also constantly innovated.In order to meet the needs of mirror support and weight reduction,the Bipod structure is a more common structural form in the form of mirror support of 1 m and above caliber.Different from the traditional frame support form,it has a great change in the optical and mechanical structure bonding and structural position calibration needs.In order to ensure that the assembly positioning accuracy and surface shape change of the mirror under the Bipod support structure meet the requirements of the system index,a high-precision assembly method for the Bipod support structure is proposed.Methods In this paper,a method of assembly and adjustment of large-aperture mirror is proposed,which combines multi-objective spatial position conversion and Stewart structure motion inversion.This method can effectively ensure the accuracy of the optical and mechanical structure adhesion points,and realize the highprecision six-dimensional adjustment between the mirror and the main bearing plate only by relying on the mirror's own support structure.By decomposing the error index of the optical system of the remote sensing camera,the requirements of the reflector installation index are determined(Fig.4).Then the laser tracker was used to measure and construct the spatial coordinate system of the mirror and the support pad.The coordinate system restoration principle based on the nominal point was adopted to achieve the normalization of the coordinate system.According to the measured data of the nominal point on the support pad,the position of the support pad was corrected and f

关 键 词：光学工程 光学装调 多目标空间位置转换 Bipod支撑结构 遥感相机 

分 类 号：V443.5[航空宇航科学与技术—飞行器设计]