星载大相对孔径宽视场成像光谱仪光学系统设计

Optical System Design of Large Relative-Apertureand Wide Field of View Spaceborne Imaging Spectrometer

高分辨率大相对孔径宽视场成像光谱仪已成为星载海洋水色遥感等领域的迫切需求，根据大相对孔径和宽视场的研究目标，采用折叠Schmidt望远成像系统与改进型Dyson光谱成像系统匹配的结构型式，设计了一个相对孔径1／1．2、视场3．9°，工作波段0．35～1．05μm的航天遥感成像光谱仪光学系统。基于像差理论，分析了改进型Dyson光谱成像系统球差校正原理。运用光学设计软件ZEMAX对成像光谱仪光学系统进行了光线追迹和优化，并对设计结果进行了分析。分析结果表明，光学系统在各个波长的光学传递函数均达到0．77以上，谱线弯曲和谱带弯曲均小于6％像元，便于光谱和辐射定标，完全满足设计指标要求，且结构紧凑，非常适合应用于航天遥感。

Spaceborne ocean colour remote sensing urgently requires large relative-aperture and wide field of view imaging spectrometer. Based on the research objective of large relative-aperture and wide field of view, a spaceborne imaging spectrometer optical system is designed using a imaging system. The relative-aperture of which is 1/1.2, folded Schmidt telescope and a modified Dyson spectral the field of view of hyperspectral image is 3.9°, and the working waveband is from 0.35 μm to 1.05 μm. Based on the aberration theory, the principle of spherical aberration correcting is analyzed in modified Dyson spectral imaging system. Ray tracing, optimization and the analysis of the design results are performed by ZEMAX software. The analyzed results demonstrate that the MTFs for different wavelengths are all about 0,77, both the line bending and the band bending of the spectrum are less than 6 % of the pixel, which is easy for spectral and radiometric calibration. The design results satisfy the requirements of specifications with a small volume and suitable for spaceborne remote sensing.