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偏振成像光谱技术可以获取目标景物的七维空间信息,其获取丰富数据信息的能力使它的应用越来越广泛。基于双Amici棱镜对多狭缝偏振成像光谱仪的光学系统进行设计,采用双Amici棱镜作为系统的分光元件提供宽视场平行光束色散,以满足多狭缝的需求;宽视场的多狭缝结构是基于常规狭缝式成像光谱仪结构进行优化的。本系统中宽视场的多狭缝光谱仪结构须做好与前置望远物镜的光瞳衔接。成像系统和偏振光谱仪系统均采用远心结构,以便与光瞳匹配,系统总长度为279mm,系统光路共轴,结构紧凑;通过调制传递函数(MTF)和点列图对光学系统的像质进行评价。结果表明:全系统在各视场典型波长处的MTF均接近衍射极限,MTF在39lp/mm处超过了0.75;各典型波长处的点列图均在艾里斑内,接近完美成像;3条狭缝对应3个不同的偏振态,可通过推扫获取目标景物的偏振信息、空间信息和光谱信息。
Polarimetric imaging spectroscopy can acquire the seven-dimensional spatial information of the target scene, and its ability to acquire rich data and information makes it more and more widely used. Based on the double Amici prism, the optical system of the multi-slit polarization imaging spectrometer is designed. The double Amici prism is used as the system’s beam splitter to provide a wide field of view parallel beam dispersion to meet the needs of multiple slits. The wide-field multi-slit structure Is based on the conventional slit imaging spectrometer structure optimized. The multi-slit spectrometer structure with wide field of view in this system must be well connected with the pupil of the front telescopic objective lens. Both the imaging system and the polarization spectrometer system are telecentric to match the pupil. The total length of the system is 279 mm. The system optical path is coaxial and has a compact structure. The image quality of the optical system is modulated by the modulation transfer function (MTF) and the dot-matrix plot Evaluation. The results show that the MTF of the whole system at each typical field of view is close to the diffraction limit, and the MTF exceeds 0.75 at 39 lp / mm. The dot plot at each typical wavelength is within the Airy spot and is near perfect imaging. The slit corresponds to three different polarization states, and the polarization information, the spatial information and the spectral information of the target scene can be obtained by push-scanning.