一种大相对孔径长波无热化鱼眼镜头设计OA

To satisfy the application requirements of large-field infrared monitoring,a passive athermal long-wave infrared(LWIR)fisheye lens optical system was designed based on aberration and fisheye lens design theory.The system has a focal length of 1.4 mm and achieves excellent imaging with a 200° fisheye field of view under a relative aperture of 1.14,matched with a 384×288 long-wave uncooled detector.According to simulation results obtained using ZEMAX(optical design software),the relative illuminance of the system is better than 97%,the f-θ distortion is less than 1.2%,and the Modulation Transfer Function(MTF)is greater than 0.4 at 33 lp/mm.A passive optical compensation athermalization design was adopted to achieve stable imaging quality over a temperature range of-40℃to+60℃.In conclusion,the system features a large relative aperture,a wide field of view,high relative illuminance,low cost,and a wide temperature adaptation range.It can therefore be widely applied in large-angle monitoring fields such as astronomical meteorology,environmental monitoring,and public security and border defense.