基于天塞主镜的多尺度长焦成像系统设计

Design of a Multi-Scale Long-Focal Imaging System Based on Tessar Primary Lenses

针对提升多尺度成像系统的分辨率以满足对远距离目标精确识别的需求,从提升主镜焦距的角度出发,本文提出一种基于天塞结构主镜的多尺度长焦成像系统设计,分析了为满足次级镜头的线性排布而需要对主镜添加的两个约束条件,针对次级镜头阵列中随离轴角增加使系统在对应视场成像质量下降的问题,对邻近区域次级镜头进行协同优化,同时在离轴位置次级镜头的优化中应用自由曲面面型完成像差校正。所设计系统不同视场区域成像的MTF曲线一致性较好,表明系统在全视场范围内成像质量理想。采用天塞结构主镜设计的多尺度成像系统,其空间分辨率达14μrad,相较于共心球透镜的多尺度系统有显著提高。

In order to meet the demand for accurate identification of distant targets by improving the resolution of multi-scale imaging systems,from primary lenses focus,a design scheme of a multi-scale long-focal imaging system based on the Tessar primary lenses is proposed in this paper.Two constraints that need to be added to the primary lenses for meeting the linear arrangement of secondary lenses are analyzed.In response to the problem of the imaging quali-ty degradation of the system as the off-axis angle of the secondary lenses array increases,synergy optimization is applied to the secondary lenses in adjacent areas.Additionally,free-form surface types are used to correct aberrations in the off-axis position optimization of the secondary lenses.The MTF curves of different field-of-view areas are consistent,showing that the system achieves ideal imaging quality across the full field of view.The spatial resolution of the multi-scale imaging system designed using the Tessar primary lenses structure is 14μrad.Compared to multi-scale systems based on concentric spherical lenses,it is significantly higher.