Design of Coaxial Three-mirror Infrared Optical System for Space Camera
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The developing trend and characteristics of the space optical system are long focal length,large view field,light weight,small dimension,large relative aperture and high image quality.The structural parameters of the coaxial three-mirror system can be solved and optimized by ZEMAX.The coaxial three-mirror system with focal length of 5 000 mm and F number of 10 is designed.The result indicates that the field of view of the system is 8°,and MTF is higher than 0.4 at 50 lp /mm.The image quality of the optical system approaches the diffraction limit,and can meet the different requirements of high-resolution space camera.This design has a theoretical guidance and significance for the design and selection of structure as well as manufacture of space camera IR optical system.