地基光电成像系统中单芯轴的设计与优化  

Design and optimization of a single-core axis in a ground-based photoelectric imaging system

作　　者：祝汉旺 薛向尧[1] 邵明振[1] 张文豹[1] 李赏 王秀硕 王广义 杨欣宇 Zhu Hanwang;Xue Xiangyao;Shao Mingzhen;Zhang Wenbao;Li Shang;Wang Xiushuo;WangGuangyi;Yang Xinyu(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院大学,北京100049

出　　处：《红外与激光工程》2024年第3期149-161,共13页Infrared and Laser Engineering

基　　金：中国科学院重大创新项目(E10302Y3M0);国家自然科学基金项目(61904178)。

摘　　要：在大俯仰角和极端温差条件下,保持地基光电成像系统主镜面形精度的稳定性是关键。文中提出了一种新型单芯轴支撑结构,旨在提高主镜在极端环境下的稳定性和热膨胀适应能力,从而保证面形精度。通过卡式第二定理深入分析单芯轴应力尺寸链参数对镜面误差的影响,并结合Isight平台和多岛遗传算法进行结构参数优化,实现了结构稳定性与面形精度的平衡。仿真结果表明,在不同环境条件下,主镜的均方根波前误差(RMS)均小于30 nm,峰值差(PV)小于120 nm,满足光学成像的高标准要求。此外,在ΔT=80℃、主镜光轴水平状态下,RMS和PV的优化率分别达到59.99%和23.2%,刚体位移的优化率高达21.96%,体现了设计的高效性。在20℃和40℃的控制室温条件下进行的激光干涉仪测试进一步证实了设计的有效性,以及与仿真结果的高度一致性。该研究为在大温差、大俯仰角条件下的地基光电成像系统中,中口径主镜的支撑结构设计提供了有力的参考,特别是在提高主镜面形精度方面具有重要意义。未来的研究将探讨该结构在更广泛温差和更大口径主镜下的应用,以及进一步优化其光学性能和结构稳定性。Objective The study aims at addressing a critical need in ground-based optoelectronic imaging,which is enhancing the surface form accuracy of primary mirrors under extreme conditions such as large pitch angles and significant temperature variations.This aim is vital as it directly impacts on the quality of optical imaging,an increasingly important factor in various applications ranging from scientific research to defense.Recognizing the limitations of traditional support structures in these challenging environments,a novel monolithic shaft support structure was developed in this paper.This new design was targeted to significantly improve the stability and thermal adaptability of primary mirrors,ensuring their performance in demanding conditions.The study involved rigorous theoretical analysis using Castigliano's second theorem and practical optimization using advanced techniques like the multi-island genetic algorithm.These methods were integral to balancing structural stability with precise surface form accuracy,setting a new benchmark in the field.In essence,this research sought to revolutionize the design and functionality of support structures for medium-caliber primary mirrors in groundbased optoelectronic systems,enhancing their reliability and performance in extreme environments.This advancement was not just an improvement but a necessary step to meet the growing demands for high-quality optical imaging in diverse and challenging conditions.Methods A novel single-core-axis support structure was proposed to enhance the mirror's stability and adaptability to thermal expansion.The study utilized Castigliano's second theorem for an in-depth analysis of the impact of the single-core-axis stress size chain parameters on the mirror surface errors.Further,an integration of Isight platform and a multi-island genetic algorithm was employed for optimizing the structural parameters.This approach allowed for a fine-tuned balance between structural stability and surface accuracy.Results and Discussions In this study,the

关 键 词：光电成像 主镜支撑 有限元分析 优化设计 单芯轴 

分 类 号：TH122[机械工程—机械设计及理论]