远紫外电离层高光谱成像仪杂散光抑制研究

Stray-Light Suppression of Far Ultraviolet Ionization Layer Hyperspectral Imager

电离层空间环境复杂,紫外波段辐射能量微弱,如何抑制远紫外高光谱成像仪杂散光是研究远紫外电离层高光谱载荷的重要环节。依据系统技术要求,给出单超环面光栅型高光谱成像仪杂散光抑制方法,首先分析杂散光的主要来源和传播路径,利用UG软件设计消杂光结构,使用LightTools软件仿真不同视场和不同光栅衍射级次下接收面的能量响应,评估杂散光抑制效果。结果表明:视场外杂散光能量和视场内光线能量量级相差10^(-5)~10^(-7),光栅非工作衍射级次光线能量和工作级次能量量级相差10^(-6)~10^(-8),中心波长处光谱杂光系数为0.9975%,所提方法满足空间远紫外高光谱遥感指标要求。

The ionospheric space environment is complicated,and the ultravioletband light energy is feeble.Therefore,an important part of the study of the far ultraviolet ionization layer hyperspectral load is understanding how to suppress the stray light of a far ultraviolet hyperspectral imager.As per the system technical requirements,this paper presents a straylight suppression method for a single toroidal grating hyperspectral imager.To evaluate the straylight suppression effect,we first examined the main sources and propagation paths of stray light,then designed a structure for straylight elimination using the UG software,and finally used the LightTools software to simulate the energy response of the receiving surface under various fields of view and grating diffraction levels.The results demonstrate that the difference between the stray light energy out of the field of view and the light energy in the field of view is 10^(−5)‒10^(−7),and the difference between the nonworking diffraction level light energy of the grating and the working level light energy is 10^(−6)‒10^(−8),and the spectral straylight coefficient at the central wavelength is 0.9975%,indicating that the proposed method meets the requirements of far ultraviolet hyperspectral remote sensing in space.