In this paper, a dual-mode linear scanning infrared zoom optical system is proposed. The system has searching and forward-looking dual-mode. Based on 768×8 long-wave infrared line cooled detector, a two-stage zoom optical system with three times imaging structure is designed. Kepler telescope structure with middle image plane was used in the front optical path, and secondary imaging optical structure was used in the rear optical path. The scanning mirror was set at the exit pupil position of the front optical path, so as to reduce the size of the objective lens and scanning mirror. When the system is in searching mode, the scanning mirror is in static state, and the scene scanning image is realized by cooperating with the detector readout circuit through the rotating speed of the turntable. When the system is in the forward-looking mode, it can realize the gaze imaging of 1024×768 by the scanning mirror. The operating band of the optical system is 7.7μm ~10.3μm, F/3, and the focal length is 300mm/100mm. The focal length of the system can be switched by cutting in and out the zoom lens group. At the same time, the resolution is further improved through lens micro scanning in the optical system. The system has the characteristics of flexible working mode, high imaging quality, good optical axis consistency and high transmittance.
The optical system of infrared scanning thermal imager using linear array detector has inherent geometric distortion along the linear array direction of the detector. The reason of scanning distortion is analysed, and the mathematical formula of scanning distortion in the linear array direction is derived by using vector method. The mathematical results show that the distortion D along the linear array direction in the optical system of infrared scanning thermal imager is related to the sway angle θ of the scanning mirror. In order to verify the calculation results, Code V software is used to analyse the optical system of infrared scanning thermal imager, and the distortion of different sway angles is obtained and compared with the theoretical calculation values.
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