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为实现高光谱成像系统小型化、轻量化和高成像质量的要求,并使全工作波段具有更高的光学效率,提出以Féry棱镜组合作为分光元件的Dyson高光谱成像仪系统,系统中引入消色差棱镜组合以减小光谱的非线性色散,使棱镜系统色散的线性度达到较高。结果表明,可见-近红外(VNIR)光谱通道的光学调制传递函数(MTF)达到0.9以上,光谱分辨率为4.2～6.8nm。短波红外(SWIR)光谱通道的MTF达到0.73～0.87,光谱分辨率为6.4～12.5nm。通过消色差Féry棱镜组合的设计,该光学成像系统两个光谱通道内的相对谱线弯曲均小于0.05%,色畸变小于0.13%。
In order to meet the requirements of miniaturization, weight reduction and high image quality of hyperspectral imaging system and to make the optical bandwidth of the whole working wavelength band higher, a Dyson hyperspectral imager system using Féry prism as a spectroscopic element is proposed. Color prism combination to reduce the nonlinear dispersion of the spectrum, the linearity of the prism system to achieve higher dispersion. The results show that the optical modulation transfer function (MTF) of the visible-near-infrared (VNIR) spectral channel reaches above 0.9 and the spectral resolution is 4.2-6.8 nm. The MTF of shortwave infrared (SWIR) spectral channel is 0.73 ~ 0.87 and the spectral resolution is 6.4 ~ 12.5nm. Through the design of the achromatic Féry prism assembly, the relative spectral curves in both spectral channels of the optical imaging system are less than 0.05% and the color distortion is less than 0.13%.