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望远镜的紧凑型闭环液晶自适应光学系统设计

ISSN号：1007-2780
期刊名称：《液晶与显示》
时间：0
分类：TH754[机械工程—仪器科学与技术;机械工程—精密仪器及机械]
作者机构：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033, [2]中国科学院研究生院,北京100049
相关基金：国家自然科学基金资助项目（No.60736042 No.60578035 No.50703039）; 吉林省与中科院科技合作项目（No.2008SYHZ0005）

作者：陈浩[1,2], 宣丽[1], 胡立发[1], 曹召良[1], 穆全全[1,2]

关键词：自适应光学, 望远镜, 离轴抛物面反射镜, 公差, Zemax软件, adaptive optics, telescope, off-axis parabolic mirror, tolerance, Zemax software

中文摘要：

在利用地基大口径光学望远镜进行天文观测时,液晶自适应光学成像技术已经被应用于校正大气湍流所引起的波前像差。应用Zemax软件和尽量少的光学元件,设计出了与1200mm望远镜匹配的紧凑型闭环液晶自适应光学系统。针对本套闭环自适应光学系统自身的特殊要求,制定了具体的公差原则,并应用Zemax软件进行了公差分析,结果表明,本套闭环液晶自适应光学系统具备较宽松的公差条件,可以实现较容易的加工和装调。对该紧凑型闭环液晶自适应光学系统与1200mm望远镜对接匹配后的性能进行了相应的评价：自适应光学系统与1200mm望远镜对接匹配后的组合焦距为19.13m,F数为17.92,P-V值为0.122λ,RMS值为0.031λ,MTF曲线接近衍射极限,光学传递函数的模在33 lp/mm时可以达到0.5,而成像CCD的极限分辨率为31 lp/mm,充分地利用了CCD相机的分辨资源。

英文摘要：

In astronomical observation and space object detection,larger-aperture telescopes are used widely.Liquid crystal adaptive optics imaging technology has been used in correction of the aberration caused by atmospheric turbulence.In order to verify the validity of the technology,Zemax software and the optical components as few number as possible are used to design the compact type closed-loop liquid crystal adaptive optical system,and the characteristic of the system is evaluated.The specific tolerance principle is established.According to the tolerance analysis,it can be seen that the compact type adaptive optical system has a more relaxed tolerance conditions.And it is easier to achieve processing and alignment.We designed the compact type closed-loop liquid crystal adaptive optical system and make it match 1 200 mm telescope.The property of the whole system was evaluated correspondently.The focal length of the whole optical system is 19.13 m and the F number is 17.92.The peak-valve（P-V） value is 0.122λ.The RMS value is 0.031λ.The modulation transfer function（MTF） of the whole system is almost the same as the diffraction limited.MTF is 0.5 at 33 lp/mm.The limited resolution of the CCD is 31 lp/mm,we could see that the resources of CCD has been used effectively.

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