摘要
为了解决空间对地遥感光学系统探测波段窄、分辨率低等问题,设计了一款非球面离轴三反光学系统。对计算得到的同轴三反结构进行了视场离轴处理,优化了像差,分析及评价了离轴三反系统的成像质量。设计得到的光学系统分辨率在可见光及短、中波红外波段都得到了提升,分别能够达到2 m、3.3 m以及10 m的地元分辨率,系统三个反射镜面型均为偶次非球面,焦距600 mm,相对孔径1/4.3,视场角8°×4°,最大畸变0.4%。各波段在奈奎斯特频率处的MTF值均高于0.2,且RMS半径满足小于探测器最小像元尺寸的成像要求。实现了高分辨率、宽波段的设计目标所要求的各项指标,从而提升了系统全时间段、全天候的信息获取能力。
In order to solve the problems of narrow detection band and low resolution of space-to-ground remote sensing optical system,an aspheric off-axis triple inverse optical system is designed.The off-axis field of view of the computed coaxial tri-reflective structure is processed,the aberration is optimized,and the imaging quality of the off-axis tri-reflective system is analyzed and evaluated.The resolution of the designed optical system is improved in the visible and short-and mid-wave infrared bands,reaching 2 m,3.3 m and 10 m ground resolution,respectively.The system has three reflectors with even aspheric surface,600 mm focal length,1/4.3 relative aperture,8°×4°field of view and 0.4%maximum aberration.The MTF value at Nyquist frequency is higher than 0.2 for each band,and the RMS radius meet the imaging requirement of less than the minimus image element size of the detector.The high resolution and wide band design objectives have been achieved,thus enhancing the system's all-weather information acquisition capability.
作者
张媛
陈智利
胡涛
张润禄
ZHANG Yuan;CHEN Zhi-li;HU Tao;ZHANG Run-lu(School of Optoelectronic Engineering,Xi’an Technological University,Xi’an 710021,China)
出处
《光学与光电技术》
2023年第1期72-80,共9页
Optics & Optoelectronic Technology
基金
科技部政府间国际科技创新合作重点专项(2018YFE0199200)
国防科技重点实验室基金(6142602200205)
西安市科技计划(2019217214GXRC008CG009-GXYD8.3)资助项目。
关键词
光学系统设计
离轴三反光学系统
偶次非球面
视场离轴
高分辨率
optical system design
off-axis three-mirror optical system
even asphere
off-axis field of view
high resolution
