新型自准直外掩式日冕仪  

A New Autocollimation Externally Occulted Coronagraph

作　　者：丁悦 张红鑫[1] 黄玉鹏 王泰升[1] 许文斌[1] DING Yue;ZHANG Hongxin;HUANG Yupeng;WANG Taisheng;XU Wenbin(Changchun Institute of OpticsFine 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,长春130033 [2]中国科学院大学,北京100049

出　　处：《光子学报》2023年第5期185-196,共12页Acta Photonica Sinica

基　　金：民用航天技术预先研究项目(No.D030203)。

摘　　要：为了更好地实现对日冕及日冕物质抛射的观测,并使观测角度更加精准,设计了太阳对准系统,利用对准系统对太阳成像,根据探测器上太阳像的圆心坐标判断是否对准并调整日冕仪观测角度。将太阳对准系统应用在三圆盘外掩式日冕仪上进行实验,该日冕仪视场为±20°,工作波段为630~730 nm,F数为4,焦距为38 mm,分辨率为1.2’/pixel。对比了单圆盘外掩体与三圆盘外掩体对外掩体边缘衍射光的抑制能力,并提出一种黑洞检测法对日冕仪总杂散光进行检测。实验结果表明,日冕仪指向精度达到0.11’,三圆盘外掩体边缘衍射杂散光低于单圆盘外掩体边缘衍射光,且日冕仪总杂散光抑制水平达到10-13量级。杂散光检测方法结果良好,准确性高,对准系统实现了预期功能。Coronal is the outermost layer of the solar atmosphere,which ranges from the chromosphere across several sun radii.Coronal Mass Ejections(CMEs)eject large amounts of magnetized plasma from the sun's atmosphere into interplanetary space,resulting in massive solar explosions.Especially when CMEs spreads to the vicinity of the earth,they will produce geomagnetic disturbances such as geomagnetic storms,ionospheric storms,auroras,which have a destructive impact on satellite operations and ground infrastructure,and are one of the main driving sources of disastrous weather in space.The corona has long been studied internationally.Observations of the corona and coronal mass ejections help to study the effects of the sun's magnetic field on the earth.Meanwhile,they can monitor the severe space weather events affecting the earth and solar-terrestrial space.To realize the corona and coronal mass ejections observation better,and make more precise observation angles.The solar alignment system is designed in this paper.The entrance pupil diameter of the system is 40 mm,the focal length is 360 mm and the field of view is 2 degrees.With alignment system imaging to the sun,the center coordinates of the solar image on the detector are read through the program,so as to judge whether the coronagraph is aligned with the sun,and the observation Angle of the coronagraph is adjusted according to the coordinate offset calculation.The solar alignment system was applied to the three-disk externally occulted coronagraph for the experiment.The main parameters of the coronagraph are as follows:the field of view is±20 degrees;the pixel resolution is 1.2 arcmin;the pixel size is 13.5μm;the wavelength is from 630 nm to 730 nm;the effective F-number is 4;the focal length is 38 mm;and the transfer function is greater than 0.6.Compared with the brightness of the solar photosphere,the brightness of the corona light is very weak,so the suppression of stray light is the key problem of the coronagraph system.Based on the observable range of field of

关 键 词：指向精度 天文仪器 日冕仪 杂散光 外掩体 

分 类 号：TH753[机械工程—仪器科学与技术]