太阳极紫外成像光谱仪光学系统设计

Design of Optical System for Solar Extreme-Ultraviolet Imaging Spectrometer

在极紫外波段对太阳进行超光谱成像观测是研究太阳上层大气,日冕中等离子物理特性的重要手段。依据太阳极紫外成像光谱仪的应用,结合国内外极紫外成像光谱仪发展现状,制定了太阳极紫外成像光谱仪的性能指标。通过比较各种光学结构的优缺点,选择望远镜与光谱仪组合的结构。讨论并选择了可用的基本元器件,望远系统采用离轴抛物面反射镜,分光器件为高密度超环面等间距光栅。设计出符合指标的光学系统。最后给出了太阳极紫外成像光谱仪的设计过程、详细参数与结果。光学系统的工作波段为17.0～21.0nm,视场是1 228″×1 024″,空间分辨率达到0.8arcsec.pixel-1,光谱分辨率约为0.001 98nm.pixel-1,系统总长度约为2.8m。

Hyper-spectral imaging observation of the sun in the EUV region is an important method of research for solar＇s upper transition region,corona and plasma＇s physical property.Based on the application objective of solar extreme ultraviolet imaging spectrometer（SEUIS）,combined with the current states of domestic and foreign extreme ultraviolet imaging spectrometer,a few of parameters for SEUIS design were drew up in the present paper.The advantages and disadvantages of all kinds of optical configurations were discussed,and the configuration of combination of telescope and spectrometer was chosen.The available main components were also described,off-axis parabolic mirror was chosen for telescope,and a high density uniform-line-space toroidal grating for dispersion device.The optical system which satisfies the performance parameters was designed.The design process,detailed parameters and results were presented in the end.The working wavelength of the optics system is 17.0～21.0 nm,the field of view is 1 228″×1 024″,the spatial resolution is 0.8 arc sec·pixel-1,the spectral resolution is about 0.00198 nm·pixel-1,and the total length of system is about 2.8 m.