Research On The Reflective Optical System Of Imaging Spectrometer With Wide-field And High-resolution

Imaging Spectrometer, which combines imaging technique with spectrumtechnique, is a kind of apparatus utilized for recognizing the matters on the ground bythe spectrum while obtaining the image of the object as well as its spectrumcharacteristics. Imaging Spectrometry experiences three stages: initially refractivestyle, then refra-reflective style and reflective style till now; correspondingly, itsaperture increases, volume shrinks, weight decreases, spectral range broadens and thecost reduces. All-reflective broad-view high-resolution imaging spectrometer is thefrontier of the development of imaging spectrum technology. In order to applyreflective optical system to the imaging spectrometer, the system classification,structural features and design methods have been researched in this paper, in whichoff-axis three-reflective system is highly focused because of its excellentcharacteristics such as center obscure, small volume, tight structure, easily-realizedbroad-view as well as high-quality imaging.Aiming to the characteristics and application requirements of the researchedall-reflective prism dispersion broad-view high-resolution imaging spectrometer, themain work is focused on the design issues for this broad-view, large F#and eccentricoff-axis three-reflective optical system. Based on the imaging theory of on-axisthree-reflective system, two cases when stop on the secondary mirror and in front of the primary mirror are taken respectively, in which the conditions for realizingeccentric, initial structure design parameter formulas and third-order aberrationexpressions as well as its aberration-free solution methods are analyzed and derivedtheoretically; furthermore, several specific design examples are listed. Combined withthe engineering situation of the fiber folded FOV high-resolution hyperspectralimager prototype, the design method of eccentric off-axis three-reflective in this paperis employed to design an all-reflective eccentric pre telescope imaging system as wellas a post spectrum beam-split system. After evaluating the image quality of thedesigned system, an all-reflective fiber folded FOV high-resolution hyperspectralimager optical system which satisfies the performance requirements is achieved, andthe engineering application of the broad-view high-resolution imaging spectrometer inspace optics is improved.