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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
lcz@cho.ac.cn
Received:31 August 2022,
Revised:28 October 2022,
Published:25 March 2023
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牛炳力,康喆,李振伟等.1.2 m光电望远镜同时性三通道测光系统[J].光学精密工程,2023,31(06):793-803.
NIU Bingli,KANG Zhe,LI Zhenwei,et al.Simultaneous three-channel photometric system of 1.2 m photoelectric telescope[J].Optics and Precision Engineering,2023,31(06):793-803.
牛炳力,康喆,李振伟等.1.2 m光电望远镜同时性三通道测光系统[J].光学精密工程,2023,31(06):793-803. DOI: 10.37188/OPE.20233106.0793.
NIU Bingli,KANG Zhe,LI Zhenwei,et al.Simultaneous three-channel photometric system of 1.2 m photoelectric telescope[J].Optics and Precision Engineering,2023,31(06):793-803. DOI: 10.37188/OPE.20233106.0793.
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 owing to its practicability, simplicity, and effectiveness; however, the issue of simultaneity needs to be addressed. In this paper, a new type of simultaneous three-channel photometric system, which uses a dichroic 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 Zemax. 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 imaging 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 exposure time and signal-to-noise ratio were 1 s and 5, respectively. In the future, we will improve the detection capability of limiting magnitudes by optimizing the system.
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