摘要
轻小型、高分辨率已经成为高光谱成像仪的发展趋势。文章基于Offner型光谱成像系统的结构特点,分析了高光谱成像仪前置望远系统的设计特殊性,利用同轴反射系统的几何光学理论求解方法,给出了一种长焦距、大视场的高光谱成像仪前置望远离轴三反远心系统的设计思路和设计结果,光学系统焦距2 500 mm,视场角达到12°。分析表明,该设计在奈奎斯特频率71.4线对/mm处调制传递函数接近衍射极限,结构紧凑,不仅适用于Offner型光谱仪前置望远光学系统,还可用于其它大视场远心光学系统。
Compact type and high resolution have become the main trend of development for imaging spectrometer. Based on the research of structure characters of the Offner spectral imaging system, design peculiarities of the fore telescope system are analyzed. A noval method is presented to design the long focal length and telecentric off-axis three-mirror anastigmatic optical system as the fore telescope system, and the image quality is also given. The effective focal length is 2 500 mm and the field of view reaches 12°. The results show that the modulation transfer function reaches the diffraction limit at Nyquist frequency71.4lp/mm, the designed fore telescope optical system is compact, which is not only suitable for space borne Offner imaging spectrometer but also for other telecentric system with wide field of view.
出处
《航天返回与遥感》
北大核心
2015年第1期43-48,共6页
Spacecraft Recovery & Remote Sensing
关键词
高光谱成像
前置望远系统
离轴三反
初始结构
像质
空间遥感
imaging spectrometer
fore telescope
off-axis three-mirror reflective system
initial structure
image quality
space remote sensing
