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为了减小超光谱成像系统的质量和体积,校正光谱成像的谱线弯曲,提出了一种新型带有Féry曲面棱镜的Offner超光谱成像系统。在该系统中,一对Féry曲面棱镜位于Offner中继系统的两臂,光束两次通过Féry棱镜进行分光,因此当获得指定大小的色散值时该结构具有比传统结构更小的质量和体积。为了减小可见近红外(VNIR)光谱通道的非线性色散,在该结构中还引入一对消色差火石Féry棱镜。设计了应用于VNIR和短波红外(SWIR)两个光谱通道的超光谱成像系统,并给出了设计结果。结果表明,该光谱成像系统在两个光谱通道内的谱线弯曲均小于0.1个像元,色畸变均<0.045个像元,而非线性度小于0.1,可满足机载或星载超光谱成像仪的要求。
In order to reduce the mass and volume of the hyperspectral imaging system and correct the spectral line bending, a new Offner hyperspectral imaging system with Féry curved prism is proposed. In this system, a pair of Féry surface prisms are located on both arms of the Offner relay system and the beam is split twice by a Féry prism so that the structure has less mass and volume than conventional structures when given a dispersion of specified size. In order to reduce the nonlinear dispersion of the visible near-infrared (VNIR) spectral channels, a pair of achromatic flint Féry prisms are also introduced into the structure. The hyperspectral imaging system applied to two spectral channels of VNIR and SWIR is designed and the design results are given. The results show that the spectral curves of the spectral imaging system are less than 0.1 pixels in both spectral channels, the color distortion is less than 0.045 pixels and the non-linearity is less than 0.1, which can meet the requirements of airborne or spaceborne hyperspectral imaging Instrument requirements.