【摘要】 基于冷光学技术的多波段红外成像杜瓦是实现地基大口径望远镜红外高灵敏探测的重要手段，因此研制了一种红外相机和光机元件非共平台的多波段红外杜瓦低温（100 K）光机平台。根据需求明确低温光机平台的设计方向及设计原则，利用柔性结构设计了变形可控的低温平台。通过有限元仿真分析研究低温光机平台热变形并进行试验验证。结果表明，试验测量得到的长波光路在X方向和Z方向上的变化量分别为0.37 mm和0.04 mm，有限元分析得到对应的变形量为0.387 mm和0.021 mm；中波光路在X方向和Y方向上的变化量分别为0.36 mm和0.03 mm，有限元分析得到对应的变形量为0.385 mm和0.031 mm。分析与实测误差均在0.02 mm内，证明了低温平台设计的合理性，确保了低温下分光镜，长波成像镜组和中波成像镜组的准确位置。本研究对于今后基于冷光学技术的多波段成像杜瓦内的光机设计具有很高的参考价值。更多还原

【Abstract】 Based on cryogenic optical technology, the multi-band infrared imaging Dewar is a key component for achieving high-sensitivity infrared detection. This paper presents a cryogenic opto-mechanical platform operating at 100 K, developed for a multi-band infrared Dewar. Design objectives and principles were established according to system requirements, and a methodology employing flexure structures was adopted to obtain a cryogenic platform with controlled deformation. Thermal deformation of the platform was then investigated by finite element analysis(FEA) and experimentally validated. For the long-wave optical path, measured displacements of 0. 37 mm in the X direction and 0. 04 mm in the Z direction were obtained, while FEA predicted 0. 387 mm and 0. 021 mm, respectively. For the mid-wave optical path, measured displacements of 0. 36 mm in the X direction and 0. 03 mm in the Y direction were obtained, with FEA predicting 0. 385 mm and 0. 031 mm, respectively. All discrepancies between analysis and measurement are approximately within 0. 02 mm, demonstrating the validity of the cryogenic platform design and ensuring accurate positioning of the beam splitter, long-wave imaging lens assembly, and mid-wave imaging lens assembly at cryogenic temperatures. The findings offer valuable guidance for future cryogenic opto-mechanical designs in multi-band imaging Dewar systems.更多还原