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In order to carry out the research on the spectrum characteristics and application of target in long-wave infrared band, this paper independently designed and developed a long-wave infrared imaging spectrum system based on filter and high-precision runner. This system is mainly composed of optical system, filter wheel, electronic system, structural system and control computer. After the target light passes through the front optical system, it is imaged on the primary image plane. A high-precision filter wheel is placed on the primary image plane. The wheel is used to switch the filters of different bands to achieve spectral acquisition. Finally, it is imaged on the focal plane of the long-wave infrared detector through the rear optical system. Among them, the optical system consists of two groups of coaxial spherical lens groups, namely, the front mirror group and the rear imaging mirror group. The structural system is the supporting structure of optical elements. The main function of the electronics system is to control the rotation of the runner and provide synchronous signals for the runner and the detector core. The functions of the electronic computer include data acquisition, image display, processing, work control, etc. According to the system indexes requirements, the optical system optical path design, distortion and MTF analysis are carried out in this paper. The electronic system synchronously controls the wheel for triggering and data acquisition. At the same time, the long-wave infrared spectral data processing software is developed to realize the reading, viewing and display of spectral image data and dynamic data viewing. Finally, the feasibility of the system function is verified by the spectral image data acquisition test of the designated scene and the UAV cooperation target. This system scheme would provide technical support for the spectral characteristics detection of military target in long-wave infrared band.
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