基于Offner中继结构的机载棱镜色散成像光谱仪系统设计

考虑到机载遥感平台对成像光谱仪小型化、轻量化要求的逐渐提高，在分析了主要几种成像光谱仪特点的基础上，重点阐述了技术成熟度较高的光栅色散和棱镜色散型成像光谱仪，研究了基于Offner中继成像结构的紧凑型成像光谱系统。结合Offner同心光学系统成像特点，在给定系统指标的情况下，设计出了两种在发散和会聚光束中使用色散元件的全球面光谱系统，给出了系统的调制传递函数、点列图以及系统谱线弯曲、色畸变曲线。结果表明，两种结构的Offner成像光谱仪，实现了遥感仪器小型化的目的，具有接近衍射极限的优良成像性质。同时，很好地控制了系统的谱线弯曲和色畸变，保证了获取光谱数据的一致性。

Design of the Airborne Prism Dispersive Imaging Spectrometer System Based on Offner Relay Configuration

Considering the development of the need for small volume and light weight of spectral imaging systems on airborne platform, the characters of several main imaging spectrometers was analyzed and the present paper focuses on introducing imaging spectrometers featuring a grating or a prism disperser .A compact hyperspectral imaging system based on Offner relay configuration is reported. Combining the characters of the concentric Offner relay, and knowing the system design parameters, two novel kinds of spherical spectrometer systems using dispersive elements in divergent and convergent beam were designed. Moreover, the system MTF, spot diagram and the curves of smile and keystone were analyzed. The results show that these two kinds of Offner spectrometer achieve the purpose of a compact form of remote sensing system with excellent imaging quality close to diffraction limit. At the same time, decreasing the smile and keystone to a small (0.1) fraction of a pixel assures uniformity of acquiring spectral data.