折轴望远系统光学传递函数测试中像分析器的扫描方向

Scanning direction of image analyser on measuring optical transmit function of zigzag telescopic system

在测量具有潜望高和俯仰观察功能的折轴望远系统的光学传递函数时，往往要求获得任一视场处的子午和弧矢两个方向的ＭＴＦ，那么由正交刀口构成的扫描器必须沿着恰当的方向扫描。本文提出了用旋转像分析器的方法来解决这种复杂系统的ＭＴＦ测试，同时给出了扫描器的转角与望远系统折轴角和视场角的大小关系，以供实际工程设计及测试时参考。

Measuring optical transmit function of zigzag telescopic system with periscope and pitch observe, in other words, obtaining usual MTF of it tangential or sagittal plane to any visual field, scanner of the tester formed of knife edges at right angles must be along corret direction. This paper presents method of measuring MTF of complicated telescopic system by means of rotation of image analyser, and give relations between direct angle of scanner and zigzag angle and visual field of the telescopic system.