主镜台阶数目对衍射成像系统传递函数的影响分析

发布时间：2018-06-24 08:24

本文选题：衍射成像系统 + 二元位相型菲涅尔透镜　；参考：《光电工程》2017年08期

【摘要】：为研究位相型菲涅尔透镜台阶近似引起的衍射杂散光对衍射成像系统调制传递函数(MTF)的影响,本文运用波动光学仿真分析方法模拟光波的传播。通过有限个级次的衍射波面在系统像面上相干叠加,得到系统的点扩散函数(PSF);对其进行傅里叶变换,得到系统的MTF。以菲涅尔主镜口径为80 mm的衍射成像系统为样机,分析了衍射主镜台阶数目为二、四、八时,系统MTF与理论设计值的差异。结果表明,随着衍射主镜台阶数目的增加,衍射杂散光对系统MTF的影响减小;并且四台阶时,与设计值的偏差已经小于0.5%。最后结合几何光线追迹仿真分析,提出将衍射主镜加工成中心区域多台阶、边缘部分为二台阶的思路,降低了衍射杂散光的影响。
[Abstract]:In order to study the effect of diffractive stray light caused by the step approximation of phase Fresnel lens on the modulation transfer function (MTF) of diffractive imaging system, the wave optics simulation method is used to simulate the propagation of light wave. The point diffusion function (PSF) of the system is obtained by the coherent superposition of a finite number of diffractive wave surfaces on the image plane of the system, and the MTF of the system is obtained by Fourier transform. Taking the diffraction imaging system with Fresnel primary mirror aperture 80 mm as the prototype, the difference between the MTF and the theoretical design value of the diffraction primary mirror step number of 2, 4 and 08:00 is analyzed. The results show that the influence of diffractive stray light on MTF decreases with the increase of the number of diffractive primary mirror steps, and the deviation from the design value is less than 0.5 at four steps. Finally, combining with the simulation analysis of geometric ray tracing, the idea of dividing the diffraction primary mirror into multiple steps in the center region and the edge into two steps is put forward, which reduces the influence of diffractive stray light.
【作者单位】：中国科学院光电技术研究所;中国科学院大学;
【基金】：国家重点研发计划地球观测与导航重点专项(2016YFB0500200)
【分类号】：O436.1

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