星载多模式差分吸收高光谱成像仪光学设计  

Optical Design of Space-Based Multi-Model Differential Optical Absorption Hyperspectral Imager

作　　者：薛庆生[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《光学学报》2016年第7期231-238,共8页Acta Optica Sinica

基　　金：国家自然科学基金(41575023;41105014);中科院长春光机所领域前沿创新项目

摘　　要：星载多模式差分吸收高光谱成像仪是一种新型空间大气探测仪器,要求同时具有天底、临边和掩日等多模式探测功能,主要用于二氧化硫、二氧化氮等大气痕量气体探测。提出了利用两个扫描镜切换不同探测模式、利用双光谱仪减小系统的光谱杂光,利用分色片将工作波段分成3个通道实现多模式高光谱分辨率探测的新方法,设计了一个多模式差分吸收高光谱成像仪光学系统,瞬时视场为1.8°×0.04°,系统F数为2,工作波段为250～500nm,分成250～310nm、300～410nm和400～500nm 3个通道。利用ZEMAX-EE软件进行优化设计和分析,其中250～310nm通道,光谱分辨率为0.12nm,满足光谱分辨率不大于0.4nm的指标要求;300～410nm和400～500nm通道,光谱分辨率分别为0.25nm和0.23nm,满足光谱分辨率不大于0.6nm的指标要求。多模式差分吸收高光谱成像仪在空间维方向的调制传递函数（MTF）在特征频率0.25lp/mm处达到0.98以上,能够满足空间多模式差分吸收高光谱大气探测的要求。Space-based multi-model differential optical absorption hyperspectral imager is a new type space atmospheric sounder.It requires the multi-model sounding functions including nadir,limb and sun occultation.It chiefly sounds the trace gases such as SO2,NO2 and so on.A new method of multi-model sounding with high spectral resolution is proposed.The method uses two-scanning mirrors to switch differential sounding model,double-spectrometers to reduce the spectral stray light,and dichroic filter to divide working waveband into three channels.An optical system of multi-model differential optical absorption hyperspectral imager is designed.The instantaneous field of view is 1.8°×0.04°.The F number of the system is 2.The working waveband is 250~500nm,which is divided into three channels,the first one is 250~310nm,the second one is 300~410nm,and the last one is 400~500nm.Optimization design and analysis are performed by ZEMAX-EE software.The spectral resolution is 0.12 nm in the waveband of 250~310nm,which satisfies the requirement specification of no more than 0.4nm.The spectral resolutions are 0.25 nm and 0.23 nm in the waveband of 300~410nm and 400~500nm,respectively,which satisfy the specification requirement of no more than 0.6nm.The modulation transfer function（MTF）of multi-model differential optical absorption hyperspectral imager is more than 0.98 at characteristic frequency of 0.25lp/mm in the spatial dimension.The design results satisfy the requirements of multi-model differential optical absorption hyperspectral atmospheric sounding.

关 键 词：光学设计 多模式 差分吸收 高光谱成像仪 扫描镜 

分 类 号：O436[机械工程—光学工程]