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为满足红外成像光谱仪大光通量、高稳定性的应用需求,提出了一种基于多级阶梯微反射镜的静态化、无狭缝式、新型红外时空联合调制型傅里叶变换成像光谱仪结构.对其工作原理和光程差的产生方式进行了分析.作为该成像光谱仪的重要部件,前置成像系统决定了光程差的分布,其性能直接影响到目标物体的图像质量.根据系统光程差的产生方式,分析和设计了像方远心光路结构的前置成像系统.利用被动光学消热差方法对前置成像系统进行了消热差研究.结果表明:当温度在-20—60?C的范围内时,各个视场的调制传递函数均达到衍射极限,在多级阶梯微反射镜的总阶梯高度范围内成像质量良好;在不同的温度下,各视场处主光线在像面上的最大入射角小于0.02?.
In order to meet the application requirements of large flux and high stability of infrared imaging spectrometer, a static, non-slit and new infrared space-time Fourier transform imaging spectrometer structure based on multistage ladder micromirror is proposed. Its working principle and the way of optical path difference are analyzed.As an important part of the imaging spectrometer, the front imaging system determines the distribution of optical path difference, and its performance directly affects the image quality of the target object.According to the system optical path difference The way of generation, the front imaging system like Fang Yuan-Xin optical path structure was analyzed and designed.The research on the difference of heat removal before the imaging system was made by using the passive optical method of heat dissipation difference.The results show that when the temperature is between -20-60? C , The modulation transfer function of each field of view reaches the diffraction limit, and the image quality is good within the total step height of the multistage ladder micromirror. At different temperatures, the chief ray of each field of view is on the image plane The maximum angle of incidence is less than 0.02?