近地天体望远镜配置大阵面CCD后轴外像差的校正
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1.中国科学院紫金山天文台南京210033;2.中国科学院行星科学重点实验室南京210033;3.中国科学院红外探测与成像技术重点实验室上海200083;4.中国科学院比较行星学卓越创新中心合肥230026;5.中国科学院紫金山天文台望远镜技术实验室南京210033;6.中国科学技术大学天文与空间科学学院合肥230026)

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\hangafter 1 \hangindent 2.5em 国家自然科学基金项目(11633009、11273067), 中国科学院红外探测与成像技术重点实验室基金资助


Correction of Off-axis Aberration of the China Near Earth Object Survey Telescope with 10k CCD
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1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210033;2. Key Laboratory of Planetary Sciences, Chinese Academy of Sciences, Nanjing 210033;3. Key Laboratory of Infrared System Detection and Imaging Technology, Chinese Academy of Sciences, Shanghai 200083;4. Center for Excellence in Comparative Planetology, Chinese Academy of Sciences, Hefei 230026;5. Laboratory of Telescope Technology, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210033;6. School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026;

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    摘要:

    近地天体望远镜由SI600S (4ktimes4k) CCD升级为STA1600LN (10ktimes10k) CCD后, 观测视场由4deg^2增至9deg^2, 可用视场直径由望远镜原设计视场的3.14$^\circ$增至4.28$^\circ$, 超出原设计36%, 同时作为CCD密封窗的场镜增厚8.75mm; 两个因素导致10k CCD成像的轴外像差增大, 视场外围的像质变差. 依据望远镜原始设计光学参数, 借助光学设计软件ZEMAX进行像质改善尝试, 最终选择在10k CCD场镜前插入一个由两片球面透镜组成的场改正镜, 使10k CCD的轴外像差得到校正. 同时还提出了一个进一步拓展近地天体望远镜观测能力的设计方案, 将望远镜的可用视场从目前的14.38deg^2扩展至28.27deg^2.

    Abstract:

    The SI600S (4ktimes4k) CCD of CNEOST (China Near Earth Object Survey Telescope) now has been upgraded to STA1600LN (10ktimes10k), with the image region size that becomes larger, and the observation field of view (FoV) of telescope that enlarges from 4 to 9 deg^2. And correspondingly, the diameter of the original available FoV is expanded, from 3.14$^\circ$ to 4.28$^\circ$, which is improved by 36% compared with the original design. Moreover, the thickness of the field lens increases by 8.75mm. These two factors lead to the result that the off-axis aberration increases and image quality becomes worse. In order to solve this problem, based on the original optical design parameter of the telescope, we try to improve the image quality with the ZEMAX optical design software. The method is to design an additional field corrector to correct the off-axis aberration. The corrector is composed of two lenses with all spherical surfaces, and placed in front of the existing field lens. Furthermore, we put forward a new optical design which expands the available FoV from 14.38 to 28.27 deg^2.

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照日格图,赵海斌,刘伟,李彬.近地天体望远镜配置大阵面CCD后轴外像差的校正[J].天文学报,2019,60(6):60-69.

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  • 收稿日期:2019-04-10
  • 最后修改日期:2019-06-21
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  • 在线发布日期: 2019-12-05
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