电离层遥感远紫外成像光谱仪光学系统设计

Optics Design of Far Ultraviolet Imaging Spectrometer for Ionosphere Remote Sensing

基于Czerny-Turner分光结构的成像光谱仪光学系统,介绍了一种用于电离层观测的远紫外成像光谱仪光学系统设计方法。分析了该结构的像差来源,提出了使用发散光照明光路的消像差方法,计算了像差校正条件。设计了工作在120～180nm波长范围内的远紫外成像光谱仪光学系统,视场角为6.0°×0.1°,焦距为121.8mm,F数为6.2。利用调制传递函数(MTF)和成像仿真分析的方法对该系统的主要性能参数进行了评价,验证了设计的成像光谱仪的光谱分辨力优于1.0nm,空间分辨力优于0.1°,完全满足电离层观测的应用要求。与同类设计相比,该系统不含非球面光学元件,加工装调简单且易于工程实现。

Useing Czerny-Turner structure as the beam splitter a new optical design method of far ultraviolet imaging spectrometer used to get ionosphere data is presented. A source of aberration is analyzed. The method of aberration correction based on divergent illumination is proposed, which the imaging spectrometer is designed by. The wavelength range, field of view, focal length and F number, respectively, are from 120 to 180 nm, 0.1°× 6.0°, 121.8 mm and 6.2. The designed system is evaluated by modulation transfer function （MTF） and imaging simulation. Its spectral resolution is better than 1.0 nm and its spatial resolution is better than 0.1°, which can meet with the requirements of ionosphere observation. Without any aspherical mirror, the optics is easy to manufacture.