1.2 m光电望远镜同时性三通道测光系统  

Simultaneous three-channel photometric system of 1.2 m photoelectric telescope

作　　者：牛炳力 康喆[1,2] 李振伟 吕游[1] 刘承志 NIU Bingli;KANG Zhe;LI Zhenwei;LÜYou;LIU Chengzhi(Changchun Observatory,National Astronomical Observatories,Chinese Academy of Sciences,Changchun 130117,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院国家天文台长春人造卫星观测站,吉林长春130117 [2]中国科学院大学,北京100049

出　　处：《光学精密工程》2023年第6期793-803,共11页Optics and Precision Engineering

基　　金：国家自然科学基金天文联合基金资助项目(No.U2031129);中国科学院青年创新促进会资助项目(No.2018079)。

摘　　要：基于科学级CCD相机的多色光度测量技术凭借着实用性强、简单有效等特点在天文观测中受到了广泛应用。针对传统多色测光技术缺乏同时性这一问题,本文介绍了一种新型的同时性三通道测光系统,采用分色的设计方式实现了Sloan Digital Sky Survey(SDSS)测光标准g′,r′和i′三个波段分光。首先,利用Zemax软件对三通道光度计的光学系统进行了仿真分析,仿真结果显示该系统符合总体设计指标且能够满足使用要求。然后,为验证该系统的光学性能,我们针对大量SDSS标准星开展观测,实测结果表明该设备在g′,r′和i′三个通道的视场分别为21.5′×21.5′,21.5′×21.5′和21.3′×21.3′,系统效率分别为65.6%,68.3%和63.7%,将曝光时间归算为1 s、信噪比为5时,计算得出的极限探测星等分别为15.26,16.39和15.63。接下来可通过对系统的优化,进一步提高其极限星等的探测能力。Multicolor CCD photometric technology has been widely used in astronomical observations ow⁃ing to its practicability,simplicity,and effectiveness;however,the issue of simultaneity needs to be ad⁃dressed.In this paper,a new type of simultaneous three-channel photometric system,which uses a dichro⁃ic mirror to realize light splitting in the g′,r′,and i′bands of the Sloan Digital Sky Survey(SDSS),is introduced.First,the optical system of the three-channel photometer was simulated and analyzed by Ze⁃max.The results showed that the system satisfied the overall design criteria and met the requirements for its intended application.Then,we observed a large number of SDSS standard stars to evaluate the optical performance of the equipment.The results indicated that the equipment could achieve simultaneous imag⁃ing within a field of view of 21.5′×21.5′,21.5′×21.5′,and 21.3′×21.3′in the g′,r′,and i′channels,respectively.The system efficiency for each channel was 65.6,68.3,and 63.7%,respectively,and the limiting magnitude of each channel was 15.26,16.39,and 15.63,respectively,when the expo⁃sure time and signal-to-noise ratio were 1 s and 5,respectively.In the future,we will improve the detec⁃tion capability of limiting magnitudes by optimizing the system.

关 键 词：同时性三通道测光系统 三通道光度计 SDSS 光学性能 

分 类 号：TH744[机械工程—光学工程] TH752[机械工程—仪器科学与技术] P111.3[机械工程—精密仪器及机械]