双长焦段中波红外成像系统设计OA

To solve the problems of large volume and high development cost of high-resolution infrared cooled zoom imaging systems,a design method for a cooled infrared zoom optical system based on coaxial reflection was proposed.First,the imaging principle of the catadioptric zoom optical system based on a coaxial two-reflection configuration was analyzed,and a dual-focal-length optical system was developed by combining the coaxial two-reflection primary imaging group and the zoom secondary imaging group.The initial structure of the optical system was then calculated based on the design specifications and established initial structural equations,and a multi-recombination structure was established in the optical design software for the joint optimization of dual-focus aberrations.Finally,a dual-focal-length mid-wave infrared cooled optical system with focal lengths of-500 mm and-600 mm was completed.The F-numbers of the optical system were 2.5 and 3.0,respectively.The primary mirror aperture was less than 225 mm,the total optical length was less than 315 mm,the light-blocking coefficient was 0.32,and the modulation transfer function of the dual-focal-length optical system was close to the diffraction limit.This high-resolution infrared optical system can switch between different fields of view by simply moving the position of one zoom lens group,demonstrating broad application prospects in the field of all-day high-resolution imaging.