2.16 m望远镜偏振光度计  

The 2.16-m telescope polarimeter

作　　者：邱鹏[1] 王国聪 张晓明[1] 张茗璇[2] 赵勇[3] 王建峰[1] 姜晓军[1,4] Qiu Peng;Wang Guocong;Zhang Xiaoming;Zhang Mingxuan;Zhao Yong;Wang Jianfeng;Jiang Xiaojun(Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;Xi’an Institute of Applied Optics,Xi’an 710065,China;Key Laboratory of Earth and Planetary Physics,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院光学天文重点实验室(国家天文台),北京100101 [2]西安应用光学研究所,陕西西安710065 [3]中国科学院地质与地球物理研究所地球与行星物理重点实验室,北京100029 [4]中国科学院大学,北京100049

出　　处：《红外与激光工程》2023年第7期212-225,共14页Infrared and Laser Engineering

基　　金：国家重点研发计划项目(2020YFA0406501)。

摘　　要：为了使2.16 m望远镜具备线偏振测光观测能力,开展了偏振光度计研制。该系统采用双通道分时偏振成像方案,具有偏振定标单元、偏振测量单元,可实现偏振定标、偏振测量和多色测光。完成系统研制后,将其安装在2.16 m望远镜上开展实测,依照该偏振光度计偏振观测流程拍摄了一系列非偏振标准星、偏振标准星、流量标准星;按照偏振定标和偏振态解算数据处理方法,对获取图像进行数据处理。结果显示:该偏振光度计视场为4.63′×4.63′,像元比例尺为0.54(″)/pixel,偏振度测量精度优于0.01,60 s曝光时间可以拍摄到V波段信噪比约为141的15.3等星。该偏振光度计使2.16 m望远镜具备V波段线偏振测光和快速多色测光观测能力。Objective In addition to intensity and frequency characteristics,celestial radiation also possesses polarization characteristics.Photometry and spectrophotometry can provide information on the intensity and spectral characteristics,while photopolarimetry can provide information on the polarization characteristics.Polarimetric observations of astronomical objects are of great significance for studying gamma-ray bursts,quasars,and spatial targets.To carry out such research,it is necessary for the 2.16-m telescope(Fig.1)to have the capability of polarization photometry,which leads to the development of a polarimeter for the 2.16-m telescope.Methods The polarimeter adopts a dual-channel time-division linear polarization imaging detection method combining simultaneous and time-resolved imaging(Fig.4),which mainly consists of a polarization calibration unit,a polarization measurement unit,optical lenses,controllers,and cameras(Fig.5-6),enabling polarization calibration,polarization measurement,and multicolor photometry.The polarimeter uses a polarization beam splitter and two cameras for simultaneous imaging.The image acquisition process is completed by two steps.First,images are obtained simultaneously for the 0°and 90°polarization directions;Then,by adjusting the orientation of the half-wave plate,images are obtained simultaneously for the 45°and 135°transmission polarization directions.The working process of the polarimeter(Fig.8)includes the obtaining and processing of bias and flat images,initial angle calibration of the polarizer(Fig.9),polarization calibration(Fig.10),and polarization measurement(Fig.11).Results and Discussions Following the completion of instrument development,the polarimeter was installed on the 2.16-m telescope for on-sky testing.Following the working process of the polarimeter,a series of unpolarized standard stars were chosen for polarization calibration,and polarimetric measurement observations were conducted(Fig.15).Then,a series of polarization results for polarized standard stars we

关 键 词：成像偏振测量 偏振测光 线偏振测光 天文测光 

分 类 号：P111.32[天文地球—天文学]