适用于大视场CME观测的侧面遮拦式外掩体设计  

Side-Occulted front Baffle Design for Wide-Field CME Observation

作　　者：单睿䶮 张琢[1] 董联庆 王钰 杨立欣 粘伟[1] SHAN Ruiyan;ZHANG Zhuo;DONG Lianqing;WANG Yu;Yang Lixing;NIAN Wei(Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China)

机构地区：[1]北京空间机电研究所,北京100094

出　　处：《航天返回与遥感》2023年第5期37-45,共9页Spacecraft Recovery & Remote Sensing

摘　　要：针对当前中国空间太阳观测任务中大视场日冕仪杂散光抑制需求,提出一种适用于大视场日冕物质抛射(CME)观测的日球层成像仪侧面遮拦式外掩体设计,通过在外掩体上设置多阶挡光环结构,对进入相机视场的衍射光进行抑制。基于菲涅尔-基尔霍夫衍射理论,开展组件抑制能力仿真分析,并探索不同挡光环间距、挡光环阶数、挡光环后截距等参数对于组件性能的影响。通过搭建一种适用于微弱杂散信号的测试系统,应用微光探测器和微光照度计,从图像和数值方面对组件性能进行验证。研究结果表明,经优化后的侧面遮拦式外掩体在十万级洁净度条件下杂散光抑制水平优于10^(–9),能够满足大视场CME观测的杂散光抑制要求。For the stray light suppression requirement of the large field coronagraph for Chinese solar observation,this paper proposes a side-occulted front baffle design of the heliospheric imager for wide-field coronal mass ejection(CME)observation,which adopts a multi-vane baffle system to suppress the diffracted stray light from inner field of view.This paper simulates the baffles performance and explores the influence of several factors such as vane-vane distance,vane number and vane-camera distance on the performance of the baffle design based on Fresnel-Kirchoff’s diffraction theory.A test system suitable for weak stray-light signals is built,and the performance of the baffle design is verified from the image and value aspects by using the LLL detector and LLL illuminometer.According to the result,an optimized baffle design achieves straylight attenuation at the level of ^10(–9) under class 100000 cleanliness.This design could satisfy the requirement of stray light attenuation for the wide field CME observation.

关 键 词：侧面遮拦式外掩体 日球层成像仪 日冕物质抛射 太阳观测 空间探测 

分 类 号：TH751[机械工程—仪器科学与技术] V447.1[机械工程—精密仪器及机械]