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摘要:
同心阵列系统具有小型化与大视场的优势，通过探测器的拼接可实现更大视场高分成像。为了进一步实现大视场系统结构的小型化与轻量化，本文采用伽利略型同心阵列系统结构形式，设计了一款工作在可见光波段，全视场大小为65°，焦距为19 mm，F数为4.7，总长为44.3 mm的同心阵列系统。系统的调制传递函数曲线在特征频率208 lp/mm处调制传递函数大于0.3，全视场弥散斑均方根半径均小于探测器像元尺寸2.4
$ \mathrm{\mu } $ m，成像质量接近衍射极限。由于同心阵列系统结构的特殊性，其中继系统排布紧密，各中继系统间的串扰杂散光严重影响成像质量，本文采用内置消杂光光阑的方法抑制串扰杂散光，对光学系统的杂散光进行了仿真分析，分析结果表明，在加入消杂光光阑后，杂光系数均降低至1×10−6以下，验证了串扰杂光抑制方法的有效性。为同心阵列系统的设计与分析提供了参考依据。Abstract:Monocentric multiscale systems offer the advantages of miniaturization and large field of view. In order to further realize the miniaturization and lightweight of the large-field-of-view system, this paper adopts the Galileo-type monocentric multiscale system form and designs a monocentric multiscale system operating in the visible spectrum.The modulation transfer function curve of the system is greater than 0.3 at a frequency of 208 lp/mm, and the root-mean-square radius of the full-field diffuse spot is smaller than the detector pixel size of 2.4
$ \mathbf{\mu } $ m, and the imaging quality is close to the diffraction limit. Due to the special characteristics of the monocentric multiscale system structure, in which the relay lens are closely arranged, the crosstalk stray light between the relay lens seriously affects the imaging quality, this paper adopts the method of suppressing the crosstalk stray light with the stary light stop, and carry out the simulation and analysis of the stray light of the optical system, and the analysis results show that the stray light coefficients are all reduced to less than 1×10−6 after the addition of the stray light stop, which validates the crosstalk stray light suppression method validation. It is used as a refer ence for monocentric multiscale systems optimization and design．-
Key words:
- monocentric multiscale systems /
- relay lens /
- crosstalk stray light /
- stray light stop
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图 2 同心阵列系统模型（a）开普勒系统形式（b）伽利略系统形式
Figure 2. Schematic diagram of the Monocentric multiscale systems (a) Keplerian-type systems (b) Galilean-type systems
图 3 伽利略型同心阵列系统数学模型
Figure 3. Analytical model of the Galilean-type Monocentric multiscale systems
图 5 同心球透镜设计结果（a）系统光路图（b）系统传递函数曲线（c）点列图
Figure 5. design results (a) layout (b)MTF curve (c) spot
图 6 整体系统拼接设计结果（a）系统光路图（b）系统传递函数曲线（c）点列图
Figure 6. Design results of system(a) System layout (b)Modulation Transfer Function curve (c) Spot Diagrams
图 7 同心主物镜加入消杂光光阑示意图
Figure 7. Add the stray light stop in Monocentric objectives’ parameters
图 8 同心阵列系统在LightTools中的建模
Figure 8. Modeling of Monocentric multiscale system in LightTools
图 9 PST曲线（a）2号次级相机系统PST曲线（b）3号次级相机系统PST曲线（c）4号次级相机系统PST曲线
Figure 9. The PST curve (a) The PST curve of NO.2 relay lens (b) The PST curve of NO.3 relay lens (c) The PST curve of NO.4 relay lens
表 1 系统指标要求
Table 1. System parameters requirements
参数 指标 波长 486.1 nm～656.3 nm 入瞳直径 4 mm 总视场 65° 单个次级相机视场 4.8° 同心阵列系统焦距 18 mm 
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