Design of a Wide-Band Annular Aperture Optical-Digital Joint Imaging System
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针对空间相机轻量化、小型化要求,采用一体式环形孔径透镜.由于基底单一和结构紧凑,系统存在色差和球差,引入衍射光学元件和偶次非球面校正像差,而单层衍射光学元件在宽波段存在衍射效率下降等问题,设计了一种端到端式光学-数字联合成像系统,对影响衍射效率主要级次的点扩散函数进行一致性优化,构建出空间不变的点扩散函数模型,为后续图像复原建立复原函数模型,实现退化图像的复原.最终光学-数字联合成像系统工作波段确定为 0.45～1 µm,焦距为185 mm,视场为5°,F数为4,遮拦比为0.35,系统总长为67.8 mm.
One-piece annular aperture lenses are being increasingly adopted to meet the requirements of lightweight and miniaturization for space cameras.However,the system presents certain limitations due to its use of a single substrate and compact structure,which result in chromatic aberration and spherical aberration,and the reduction of diffractive efficiency of single-layer diffractive optical element in wide band.To mitigate these issues,diffraction optical elements as well as even-order non-spherical aberration corrections have been introduced.In this paper,we propose an end-to-end optical-digital joint imaging system that optimizes the point spread function,which is the main factor affecting diffraction efficiency.We construct a spatially invariant point spread function model to establish the restoration function for subsequent image restoration,achieving the restoration of degraded images.The proposed optical system operates within the wavelength range of 0.45‒1 µm and has the focal length of 185 mm,field of view of 5°,F#of 4,shading ratio of 0.35,and total length of 67.8 mm.
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