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介绍了静态高通量干涉成像光谱技术的原理,针对红外波段目标辐射能低、系统易受自身辐射影响等特点,提出了基于分体式Sagnac干涉仪的红外高通量干涉成像光谱仪方案。分析了Sagnac干涉仪的设计方法,特别是分光镜对光线的偏折作用引起的横向剪切量和光线的折射光程不同带来的附加光程差。根据采样定理,计算了成像光谱系统对探测器和后置成像系统的要求。使用长波热像仪(光谱范围7.7~9.3μm)搭建了实验装置,实验结果表明,这种成像光谱系统能够准确测量出样品的光谱,验证了该方案的原理和设计。
In this paper, the principle of static high-flux interference imaging spectroscopy is introduced. According to the characteristics of low radiant energy in the infrared band and the system vulnerable to self-radiation, an infrared high-flux interference imaging spectrometer based on split Sagnac interferometer is proposed. The design method of the Sagnac interferometer is analyzed, especially the additional optical path difference caused by the different amount of transverse shear caused by the deflecting action of the beam splitter and the refraction optical path of light. According to the sampling theorem, the requirements of the imaging spectroscopy system for the detector and the post-imaging system are calculated. The experimental setup was constructed by using a long-wave thermal imager (spectral range 7.7 ~ 9.3μm). The experimental results show that this imaging system can accurately measure the spectrum of the sample and verify the principle and design of the scheme.