太阳上层过渡区极紫外三级次无狭缝成像光谱仪系统设计  

System Design of Extreme Ultraviolet Three-Order Slitless Imaging Spectrometer for Solar Upper Transition Region

作　　者：沈文杰 邢阳光 黄一帆[1] 彭吉龙[2] 代树武 王颖[3] 朱成林 闫雷 刘越[1] 李林[1] Shen Wenjie;Xing Yangguang;Huang Yifan;Peng Jilong;Dai Shuwu;Wang Ying;Zhu Chenglin;Yan Lei;Liu Yue;Li Lin(School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;Beijing Institute of Spacecraft Environment Engineering,Beijing 100094,China;Beijing Institute of Astronautical Systems Engineering,Beijing 100094,China;Beijing Institute of Spacecraft System Engineering,Beijing 100076,China)

机构地区：[1]北京理工大学光电学院,北京100081 [2]北京卫星环境工程研究所,北京100094 [3]北京空间飞行器总体设计部,北京100094 [4]北京宇航系统工程研究所,北京100076

出　　处：《光学学报》2024年第6期256-268,共13页Acta Optica Sinica

基　　金：国家自然科学基金(62205027,42274208);中国科学院战略性先导科技专项(XDA15018300)。

摘　　要：提出了一款工作在Ne VII 46.52 nm谱线的新型三级次无狭缝成像光谱仪,该仪器采用两个超环面等线距光栅作为衍射元件,其中单个光栅仅工作于一个级次,这解决了现有三级次仪器使用单个光栅同时工作于三个级次的弊端,显著提升了系统校正离轴光栅像差的能力,结合光谱数据反演算法可以实现24′×24′视场下的高空间(1.547″)和高光谱分辨率(0.0078 nm)观测。Objective Solar transition region is a highly dynamic plasma region with a temperature of 0.02‒1 MK in the solar upper atmosphere,which is the key field of solar physics research.Extreme ultraviolet(EUV)multi-order slitless imaging spectrometer can observe the sun in a large field of view(FOV)simultaneously with high spectral,spatial,and temporal resolution.We propose and design a novel solar EUV slitless imaging spectrometer operating at Ne VII 46.52 nm.This instrument can simultaneously correct the off-axis grating aberrations of three diffraction orders in a large FOV(24′×24′)while meeting the requirements of light weight,compact volume,and large aperture.We hope that our three-order slitless spectral imaging strategy and system design can provide a technical scheme that can achieve continuous snapshot highresolution spectral imaging observations of the upper transition region.Methods This instrument utilizes two toroidal uniform line-space(TULS)gratings and a toroidal mirror as the diffraction element and the reflective element respectively to realize a new three-order spectral dispersion structure.The±1 order dispersion planes overlap with each other and are orthogonal to the 0-order imaging plane without dispersion.We build the paraxial optical model and calculate the initial solution of the optical system.By adopting the multi-configuration of ZEMAX software and the self-defined optimization function,the initial structural parameters of the three-order subsystems are globally optimized by considering the aberration correction conditions of the TULS grating,system resolution requirements,and geometric constraints.Finally,the tolerance analysis is carried out to obtain an optical system with reasonable tolerance allocation.Results and Discussions Figs.6(a)‒(c)show the optical layout of the entire instrument,±1 order subsystems,and 0-order subsystems respectively.This instrument consists of three hyperboloidal mirrors with off-axis aperture,three Si filters,two TULS gratings,a toroidal mirror,a fie

关 键 词：成像系统 太阳空间观测 太阳极紫外 成像光谱仪 无狭缝 超环面等线距光栅 

分 类 号：O434[机械工程—光学工程]