梯度温度场下热不敏系统主反射镜性能的研究  

Characteristics study for main reflector in the thermally insensitive system in gradient temperature field

作　　者：史梦飞 高天元 韩旭 刘永清 王晓燕[2] SHI Mengfei;GAO Tianyuan;HAN Xu;LIU Yongqing;WANG Xiaoyan(Key Laboratory of Optoelectric Measurement and Optical Information Transmission Technology,Ministry of Education,School of Electronic Engineering,Changchun University of Science and Technology,Changchun 130022,China;Beijing Institute of Control Engineering,Beijing 100190,China)

机构地区：[1]长春理工大学光电工程学院,光电测控与光信息传输技术教育部重点实验室,吉林长春130022 [2]北京控制工程研究所,北京100190

出　　处：《中国测试》2022年第12期80-85,共6页China Measurement & Test

基　　金：国家自然科学基金青年科研基金(61805025)。

摘　　要：星敏感器作为高精度导航仪器,其主反射镜的面型精度是影响导航精度的主要因素。由于星敏感器处于复杂的温度环境中,在主反射镜上会出现梯度温度场,从而引起反射镜面型变化。为保证导航精度,热不敏系统得以发展。该文针对一款热不敏系统的236 mm主反射镜,进行梯度温度场的仿真和实验综合研究,来验证该反射镜能否达到面型精度的指标要求。实验中用加热片模拟主反射镜表面梯度温度场,并用干涉仪检测反射面RMS值。仿真应用Patran、Sigfit等软件进行,边界条件与实验环境保持一致,计算得出主反射镜梯度温度场和反射面RMS值。相同加热条件下,实验和仿真结果的温度变化趋势相同,实验和仿真结果的RMS增长曲线趋势相同。实验测得的RMS值和仿真计算结果的RMS值均小于0.03λ(λ=632.8 nm),满足反射镜指标要求。实验和仿真结果都表明该系统的主反射镜设计满足系统要求。Star sensor is a high-precision navigation instrument, surface accuracy of the main reflector is main factor that affects the navigation accuracy. Since the star sensor is in a complex temperature environment, there is a gradient temperature field on the main reflector, which caused a change in the surface of the reflector. In order to ensure navigation accuracy, thermally insensitive systems have been developed. In this paper, a 236 mm main mirror of a thermally insensitive system has been simulated and experimented as a comprehensive study,that verify whether the reflector can meet the requirements of surface accuracy. In the experiment, a heating plate was used to simulate the gradient temperature field on the surface of the main reflector, and an interferometer was used to detect the RMS value of the reflector. The simulation is carried out with Patran and Sigfit et, and boundary conditions are consistent with the experimental environment. The gradient temperature field of the main mirror and the RMS value of the reflecting surface are calculated. Results of the temperature change trends of the experimental and simulation are the same under the same heating conditions,the RMS growth curve trends of experimental and simulation are the same. RMS value measured by experiment and RMS value of the simulation calculation results are both less than 0.03λ(λ=632.8 nm), these meet the requirements of the reflector index. Results of experiment and simulation show that design of the main mirror for the system meets the system requirements.

关 键 词：主反射镜 梯度温度场 仿真 RMS 

分 类 号：TH701[机械工程—仪器科学与技术] TB9[机械工程—精密仪器及机械]