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1 200 mm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1 200 mm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1 200 mm望远镜对接匹配后的组合焦距为19.13 m，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。

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.