星载热红外长波光谱仪透镜柔性支撑结构研究  

Flexible Support Structure of Lens for Spaceborne Thermal Infrared Long Wave Spectrometer

作　　者：刘国庆 马超 张宗存 刘书锋[1] 康怀镕 张耀辉 李云端[2] Liu Guoqing;Ma Chao;Zhang Zongcun;Liu Shufeng;Kang Huairong;Zhang Yaohui;Li Yunduan(State Key Laboratory of Infrared Physics,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China;Shanghai Institute of Satellite Engineering,Shanghai 201109,China)

机构地区：[1]中国科学院上海技术物理研究所红外物理国家重点实验室,上海200083 [2]上海卫星工程研究所,上海201109

出　　处：《中国激光》2024年第17期290-298,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金重大项目(42192582);国家重点研发计划(2022YFB3902000);中国科学院青年创新促进会(2020242,2023246);中国科学院战略性先导科技专项(XDB0580000);民用航天技术预先研究项目(D010206)。

摘　　要：为研究热红外光学系统中深低温下多形式、窄边框透镜的支撑问题,以星载热红外高光谱成像系统为载体,采用正交设计和有限元分析相结合的方法,设计了一套透镜柔性支撑结构,解决了从常温到约70 K的大温差环境下受支撑结构影响而出现透镜面型退化和光学基准不稳定的难题。试验表明,在多形式、窄边框透镜柔性支撑的设计分析中,柔性块的宽度决定了支撑结构与透镜间的应力大小。进行了力学振动试验验证及真空低温试验测试,结果表明,力学振动试验后带有柔性支撑环的光学系统仍可稳定可靠地工作在约70 K的环境中,且光学系统调制传递函数(MTF)优于0.4,满足指标优于0.15的要求,为多形式、窄边框透镜的支撑结构设计提供了依据。Objective During thermal infrared hyperspectral imaging detection,the thermal background radiation caused by the optical-mechanical structure of the detection load itself will directly cause the annihilation of the detection signal,making it impossible to obtain an excellent signal-to-noise ratio.Designing deep cryogenic environment for the optical-mechanical structure is the only way to achieve an excellent detection effect.However,in order to ensure that the single components do not need to be adjusted during the transition from room temperature assembly to deep cryogenic operation of the lens group,the impacts of the thermal forces on the lens assembly under large temperature differences must be reduced,and the offset of the displacement caused by the thermal deformation of the single component must be further reduced to enhance the reliability and stability of the system.Hence,these issues pose huge challenges in the design of optical mirror support structures.Therefore,we aim to design a flexible support structure that can not only adapt from normal operations at normal temperature to operations at deep hypothermia of 70 K but also withstand rocket launch vibration tests.We also aim to reduce the time required to seal the single mirror and assembly as well as adjust the components.Methods According to the“zero”expansion design principle,the structural design of the optical system is carried out by individually sealing each lens and forming a lens group with multiple such single lenses.In designing and selecting materials,we consider using materials with similar thermal expansion coefficients for structures that directly match the mirror.For the lens support base and spectrometer base plate,“zero”thermal expansion coefficient materials are used(Table 1).After the materials are determined,a finite element simulation is used to obtain the test sample simulation results,and the thermal deformation and thermal stress of the single component are controlled through parameter adjustments.These data are combi

关 键 词：热红外光谱仪 低温光学 大温差 透镜柔性支撑 

分 类 号：TN219[电子电信—物理电子学]