针对光电系统视场切换问题，提出柔性切换方案，提高视场切换的速度与精度。根据某光电跟踪装置对光电成像系统小型化、轻型化的要求，设计了双视场一体化同轴、共像面光学系统，利用偏振片的起偏原理，将大小2个视场的光学系统分为俯仰偏振和偏航偏振2个光学通道，再利用液晶旋光（0，90两位置）效应和偏振片检偏原理，对俯仰偏振和偏航偏振2个光学通道进行分时选通（即柔性切换）。测试表明，2个光学通道的（柔性）切换时间只有几个毫秒，是机械式切换的1%左右。实验验证双视场柔性切换成像系统技术方案可行，能满足某光电跟踪系统的要求。

Aiming at the visual field change-over of electro-optical system, a flexibility change-over method was presented to improve the accuracy and speed of the visual field change-over. The double visual field integrated coaxial and total imaging surface optical system was designed to meet the requirements of miniaturization and light-weight for the electro-optical imaging system of a certain electro-optical tracing device. Using the polarization principle of polarizer, the electro-optical systems of these two large and small visual field were divided into two optical channels of pitching polarization and yawing polarization. Using the liquid crystal rotator (two positions of 0,90) and the polarize principle of polarizer, time-sharing (flexibility change-over) gating of these two optical channels of pitching polarize and yawing polarize was carried out. The test result shows that the (flexibility) change-over time of these two optical channel is milliseconds only, which is 1% of the mechanical change-over. The double visual field flexibility change-over imaging system technical solution is feasible, and can meet the requirement of the certain electro-optical tracing system.