Aiming at the new requirements of MWIR (Medium Wave Infrared) photoelectric equipment for infrared continuous zoom system, such as large zoom ratio, light weight and fast switching, a new type of continuous zoom optical system with three-component structure is designed based on 1280×1024 MWIR staring focal plane array detector. The working band is 3.7μm~4.8μm, the relative aperture is F/4, and the entire zoom range of focal length is 19mm~760mm. By using three-component design, the optical system achieves 40 x zoom range in a relatively compact space. At the same time, a new focusing scheme is adopted, which realizes the focusing and continuous clear imaging of WFOV (wide field of view) and NFOV (narrow field of view) at the same distance. The MTF (Modulation Transfer Function) of the optical system is close to the diffraction limit, the zoom curves are smooth, the moving stroke of each moving lens group is short, and the entire zoom process can be switched within six seconds. It can meet 100% cold stop efficiency and has good imaging quality in the temperature range of -40°C ~70°C . It has the advantages of large zoom ratio, compact size, fast switching time, high resolution and good focusing consistency.
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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