Abstract:In view of the large window size for traditional external photoelectric load pod in the unmanned aerial vehicle (UAV), which can't realize the wide field-of-view scanning, this paper proposes an infrared wide field-of-view imaging design of optical system with image side scanning technology based on rotary dual-wedge. Based on the traditional image side scanning optics, the dual-wedge scanner is introduced to increase the scanning field-of-view in the system, which solves the problem of limited infrared window but small imaging field-of-view faced by high-speed UAV. The optical design software is used to simulate the optical system. The designed object field-of-view is ±21.665°, which can meet the requirements of wide field-of-view. The design results show that the imaging quality of the system is high in the laser band of 3.7~4.8μm. The modulation transfer function (MTF) in the central field-of-view can reach 0.45 at the spatial frequency of 33(lp/mm). And the MTF of the whole field-of-view is more than 0.42@33(lp/mm). The energy concentration of image point is good, close to the diffraction limit. Compared with the traditional scanning optical system, this paper adopts a new image side scanning imaging optical system based on rotary dual-wedge, which can reduce the radial size of the optical system by more than 20% under the premise of keeping the design requirements unchanged. The system can also meet the application requirements of lightweight and miniaturization for the UAV in the future, which has a good application prospect.