| 大天区望远镜中sCMOS相机的测光精度分析 |
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| 引用本文： | 牛炳力,刘承志,李振伟,康喆,吕游.大天区望远镜中sCMOS相机的测光精度分析[J].天文学报,2022,63(1):9-98. |
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| 作者姓名： | 牛炳力 刘承志 李振伟 康喆 吕游 |
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| 作者单位： | 中国科学院国家天文台长春人造卫星观测站;中国科学院大学天文与空间科学学院 |
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| 基金项目： | 国家自然科学基金项目(U2031129);中国科学院天文大科学中心前瞻课题(Y9290201);中国科学院青年创新促进会(2018)资助。 |
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| 摘 要： | 与传统CCD (Charge Coupled Device)相机相比, s COMS (scientific Complementary Metal Oxide Semiconductor)相机被广泛装备于超大天区巡天设备,与传统CCD相机不同的是sCMOS相机采用卷帘式快门,因此对其进行测光精度的分析工作是很有意义的.首先,将s CMOS相机拍摄的图像与UCAC2 (The Second U.S. Naval Observatory CCD Astrograph Catalog)星表进行匹对,识别图像中的UCAC2标准星.接着对图中的标准星进行测光并提取测光数据进行最小二乘直线拟合,获得了相应的系统转换系数并得到仪器星等至标准星等的转换公式.然后,将转化后的仪器星等和标准星等做差并计算相应的均方根误差.最后,利用计算得到的均方根误差评估sCMOS相机的测光精度,并将标准星按星等划分后,分析了相应的测光误差.计算结果表明在标准测光夜测量亮度亮于14等的星时,测光精度优于0.15 mag.通过实测精度分析可知卷帘快门sCOMS相机具有较高的测光精度,基本满足空间碎片巡天观测的要求.
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| 关 键 词： | 仪器:探测 星表 标准星 技术:测光 方法:数据分析 |
| 收稿时间： | 2021/3/20 0:00:00 |
Photometric Accuracy Analysis of sCMOS Camera in Large Sky Telescope |
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| NIU Bing-li,LIU Cheng-zhi,LI Zhen-wei,KANG Zhe,LV You.Photometric Accuracy Analysis of sCMOS Camera in Large Sky Telescope[J].Acta Astronomica Sinica,2022,63(1):9-98. |
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| Authors: | NIU Bing-li LIU Cheng-zhi LI Zhen-wei KANG Zhe LV You |
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| Institution: | (Changchun Observatory,National Astronomical Observatories,Chinese Academy of Sciences,Changchun 130117;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049) |
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| Abstract: | Compared with the traditional CCD (Charge Coupled Device) camera, sCOMS (scientific Complementary Metal Oxide Semiconductor) camera is widely used in super large sky survey equipment. Different from the traditional CCD camera, sCMOS camera adopts rolling shutter, so it is very meaningful to study its photometric accuracy. Firstly, the UCAC2 (The Second U.S. Naval Observatory CCD Astrograph Catalog) standard stars in the image were identified by matching the image captured by the sCMOS camera with the UCAC2 catalog. Then, the photometry work of these standard stars has taken and the photometric data was extracted for least square linear fitting. The corresponding system conversion cofficients were obtained and the relations between instrument magnitudes and standard magnitudes were also discussed. The differences between the converted instrument magnitude and the standard magnitude were then compared, and the corresponding root mean square error has been calculated. Finally, the calculated root mean square error was used to estimate the photometric accuracy of the sCMOS camera, and the brightness-dependent photometric error analysis of standard stars was made. The results indicate that the photometric precision is 0.15 mag for objects brighter than 14 mag under photometric conditions. Through the analysis of the measurement accuracy, it can be seen that the sCOMS camera with rolling shutter has high photometric accuracy, which basically meets the requirements of space debris survey. |
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| Keywords: | instrumentation:detectors catalogs standards techniques:photometric methods:data analysis |
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