利用圆孔阵列光强调制作用可以有效减弱光学窗口的“猫眼”效应, 同时也会对“猫眼”目标成像质量产生一定不利影响。考虑到利用调制传递函数 (MTF)可对光电仪器成像质量进行综合评价, 分别给出了测试望远系统和微光夜视系统 MTF的数学模型, 利用自行研制的光学仪器 MTF数字化检测系统, 实现了这两种典型“猫眼”目标 MTF的数字化检测。结果表明, 圆孔阵列在全空间频率上均使“猫眼”目标的 MTF有所下降, 且孔径较小、孔阵较密的圆孔阵列对“猫眼”目标 MTF的影响较小, 这为合理设计圆孔阵列结构以减小对“猫眼”目标成像质量的影响提供了可靠的实验数据。

The “cat-eye” effect of optical window can be effectively weakened by circular holes array for its modulation, meanwhile the imaging quality of “cat-eye” target can be affected to some degree. Considering that Modulation Transfer Function (MTF) could comprehensively evaluate the imaging quality of photoelectric equipment, this paper put forward the testing models of MTF for telescope and Low-light-level night vision. The digital test of MTF of these two typical “cat-eye” targets was realized by a digital test system of MTF for optical instrument. The test results show that the circular holes array can lead to fall of “cat-eye” targets’ MTF at full spatial frequency, and if the aperture is smaller and the holesarray is more compact, the effect on MTF of “cat-eye” target may be less. This conclusion can provide reliable experimental data to reduce the effect on imaging quality when designing structure of circular holes array.