近红外多普勒差分干涉仪稳定性结构研究  

Stable Structure of a Near-infrared Doppler Asymmetric Spatial Heterodyne Interferometer

作　　者：孙剑[1,2] 冯玉涛 畅晨光[1,2] 王炜 李娟[1] 胡炳樑[1] SUN Jian;FENG Yutao;CHANG Chenguang;WANG Wei;LI Juan;HU Bingliang(Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi'an 710119,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院西安光学精密机械研究所,西安710119 [2]中国科学院大学,北京100049

出　　处：《光子学报》2023年第11期135-146,共12页Acta Photonica Sinica

基　　金：国家自然科学基金(No.41005019);中科院西部交叉团队(No.E1294301)。

摘　　要：针对现有结构无法满足大尺寸差分干涉仪稳定性固定,以星载近红外差分干涉仪稳定性结构为研究目标,优化选择光学材料实现实体差分干涉仪的热补偿,提高了光学元件温度稳定性;以支撑结构的最大结构应力和光机粘接面处最大剪切应力小于许用应力为优化目标,建立数学模型,优化设计支撑结构参数,调节组件基频,提高了组件的力学稳定性。有限元分析支撑结构最大应力65.56 MPa,小于材料的抗拉强度,光机粘接面最大剪切应力3.4 MPa;环境温度变化5℃,分光棱镜面形RMS最大变化量1.671 nm,热应力带来的干涉图畸变可忽略。力学振动试验前后,光学测试干涉条纹频率(50个条纹数)未发生变化,差分干涉仪结构满足星载力学环境条件。该方法也适用于棱镜式干涉仪稳定性支撑结构。The mounting for a space-borne Doppler Asymmetric Spatial Heterodyne(DASH)interferometer,which is a key part of the space-borne DASH wind instrument,should be able to withstand the mechanical and thermal conditions of being space-borne.As spectral resolution increases,the size of the DASH interferometer increases.The stable rugged support structure for a large-sized interferometer has become a key issue.By far,the vast majority of the vibrational energy is produced at lower frequencies.Therefore,in order to improve mechanical performance,an effort can be made to ensure that the lowest natural frequency of the mounting structure is as high as possible.In existing approaches,the natural frequency of the assembly can be increased by increasing the adhesive area.However,the(metal-to-glass)gluing surface tension breaks during the vibration tests because of the lower natural frequency.In this paper,a novel,and stable support structure is proposed,with its effectiveness exemplified for a Near-Infrared(NIR)DASH interferometer.Based on the principle of DASH interferometer technique,the materials and dimensions of the optical components were selected to compensate for the phase shift at the fringes as the arms expand with temperature,which improves the optical components′thermal stability.The mathematical model of a structure was established,and the detail optimization process was designed.Parameters affecting the spring constants were analyzed.The parameters of the structure were optimized by requiring the maximum mechanical stress of the structure and maximum shear stress at the gluing surface to be less than the strength value.The spring constants were designed to adjust the natural frequency of the DASH interferometer assembly and improve the mechanical stability.The mathematical model results show that the lower spring is much stiffer than the top spring.The maximum shear stress of the structure was 48 MPa.The maximum shear stress at the gluing surface was 1.4 MPa.The bending deformations of the gluing surfaces were

关 键 词：近红外差分干涉仪 最优结构 数学模型 结构应力 剪切应力 面形 

分 类 号：TH744[机械工程—光学工程]