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| 散射光对准确CCD平场的影响--修改某些反光镜挡光筒的必要性 | |
| 引用本文： | 姚保安,张春生,沈昌钧,彭云楼.散射光对准确CCD平场的影响--修改某些反光镜挡光筒的必要性[J].天文学报,2005,46(3):343-352. |
| 作者姓名： | 姚保安 张春生 沈昌钧 彭云楼 |
| 作者单位： | 1. 中国科学院上海天文台,上海,200030 2. 中国科学院紫金山天文台,南京210008 3. 南京大学天文系,南京,210008 |
| 摘 要： | 继前文之后，进一步说明，晨昏蒙影平场与夜天露光的差别主要由于存在散射光．像Grundahl和Sorensen那样，上海天文台1．56米和南京大学63厘米反光镜的针孔像也已获得，直观地显示了散射光的存在，1．56米和63厘米反光镜都有标准设计的挡光筒，所有标准设计的反光镜都只有两个挡光筒，分别置于主镜和付镜前面．为了在得出准确平场时CCD不受散射光影响，这样的挡光筒是不够的．这是所有标准设计的档光筒共同的弱点．为了得到更准确的平场改正，修改所有类似的反光镜主镜挡光筒是极其重要的。 |
| 关 键 词： | 望远镜 技术 图像处理 技术 CCD平场 |
| 修稿时间： | 2004年8月16日 |
Influence of Scattered Light on Accurate CCD Flat Fielding - Necessity of Modifying Baffles of Some Existent Reflectors |
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| YAO Bao-an,ZHANG Chun-sheng,SHENG Chang-jung,PENG Yun-lou.Influence of Scattered Light on Accurate CCD Flat Fielding - Necessity of Modifying Baffles of Some Existent Reflectors[J].Acta Astronomica Sinica,2005,46(3):343-352. | |
| Authors: | YAO Bao-an ZHANG Chun-sheng SHENG Chang-jung PENG Yun-lou |
| Abstract: | This paper is the continuation of paper 1]. In this paper we further show that the difference between twilight flat field and night sky exposure is mainly due to the existence of scattered light. Like Grundahl and Sorensen, we also made the pinhole images of the 1.56m at the Shanghai Observatory and the 63cm of the Nanjing University to show the existence of scattered light intuitively. Both the 1.56m and the 63 cm reflectors have normal designed baffles. Therefore it is the common weakness of all standard designed reflectors having only two baffles mounted in front of the primary and secondary mirrors which are not enough to protect the CCD cameras from scattered light in getting accurate flat fields. It is of great importance to modify the primary mirror baffle of all similar reflectors in order to get more accurate flat fielding. |
| Keywords: | telescope techniques: image processing techniques: CCD flat fielding |
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