高光谱分辨率紫外Offner成像光谱仪系统设计

Design of Hyperspectral Resolution Ultraviolet Offner Imaging Spectrometer System

紫外成像光谱仪是遥感探测仪器的重要组成部分之一。在机载和星载领域,遥感平台正逐步要求光谱仪在实现高分辨率的同时,其设备趋于轻量化和小型化。针对紫外成像光谱仪高光谱分辨率、轻量化、小型化等特点,研究了基于Offner结构的紫外成像光谱系统,设计了一种工作波段为250~400nm、狭缝长40mm、光谱分辨率为0.3nm的高分辨率紫外成像光谱仪,并对设计结果进行了分析与评价。结果表明,这种紫外成像光谱仪在38.5lp/mm处调制传递函数达到0.76以上,实现了接近衍射极限的优良成像质量;谱线弯曲和色畸变在像元尺寸的10%以内。另外,该结构在原Offner结构的基础上大大缩小了系统体积,实现了紫外遥感仪器小型化、轻量化的目的,且易于加工和装调,满足设计指标要求,适合机载和星载遥感应用。

Ultraviolet（UV）imaging spectrometer is one of the most important parts of remote sensing instruments.In the field of airborne and satellite-borne,remote sensing platforms are increasingly requiring that spectrometers be lightweight and miniaturized while achieving high resolution.Aiming at the characteristics of high spectral resolution,light weight and miniaturization of UV imaging spectrometer,the UV imaging spectroscopy system based on Offner structure is studied.The high-resolution UV imaging spectrometer with operating wavelength range of 250-400 nm,the slit length of 40 mm,the spectral resolution of 0.3 nm is designed,and the design results are analyzed and evaluated.The results show that this UV imaging spectrometer achieves a modulation transfer function above 0.76 at 38.5 lp/mm,and it realizes excellent image quality near the diffraction limit.Keystone and smile are within 10% of pixel size.In addition,the structure greatly reduces the system volume based on the original Offner structure,which realizes the miniaturization and weight reduction of the ultraviolet remote sensing instrument.It is easy to be processed and adjusted,which meets the design requirements.And it is suitable for airborne and spaceborne remote sensing applications.