A kind of multi-field of view (multi-FOV) hyperspectral imaging system based on mid-wave infrared (MWIR) has been developed for the first time, to the best of our knowledge. The hyperspectral imaging system is based on two focus length which can be used in different situation. According to the theory of zoom optics and the design method of infrared optics, the front telescope zoom system is calculated and designed, which is coupled with the acousto-optic tunable filter (AOTF) and the focus system to realize the infrared zoom optical system. By developing and optimizing the focus system and the MWIR detector, the +1-order diffracted light and 0-order light of AOTF can be clearly imaged on image plane. So that it can output the MWIR thermogram signal and spectrum signal at the same time. The experimental results show that the system can clearly image the target with 8km away. And the IFOV is up to 0.066mrad. The results pave the way to a novel spectrum detect technology based on infrared zoom optical system.
Based on the working mechanism and characteristics of spaceborne hyperspectral Fourier transform infrared spectrometer, the computer and software were used as data acquisition and processing tools in this paper to study and simulate the various processes in photoelectric information processing of spectrometer. Analytical models including functional modules such as interference signal generation, effective signal detection, spectral data inversion and instrument error correction was established, then a visualization software system was developed. Finally, the accuracy of the model was calculated and optimized with experiments, the verification results show that this resolving system can process the interference data with high spectral resolution non-destructively, significantly improve the smoothness of the restored spectrum without distortion, and the measured spectral resolution of an instrument is better than 0.03cm-1 . This digital model could provide useful support for the design and parameter optimization of the aerospace Fourier transform infrared spectrometer.
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