红外折/衍混合离轴望远系统设计

本文针对空间光学系统轻型特点,设计了一个二元光学折/衍混合红外反射式望远系统。采用了离轴式格里高利(Gregorian)结构形式,消除了望远系统中的中心遮拦问题。用衍射光学元件校正系统象差,使反射面为球面,二元光学表面尺寸比施密特(Schmidt)校正板(位于入瞳处)缩小于3～4倍,光学设计运用OSLO软件,光学系统的通光孔径φ=120mm,焦距f=-1000mm,波长λ=4.3μm,视场2ω=2°×6°(子午×弧矢),分辨率Res=0.05mm,MTF≥0.4(空间频率fre≤10cl/mm).

DESIGN OF INFRARED HYBRID REFRACTIVE-DIFFRACTIVE OFF-AXIAL TELESCOPIC OPTICAL SYSTEM

A hybrid binary optical refractive-diffrative reflective telescopic optical system is designed by us for lighter optical system in aerospace.By adopting and off-axial refractive-diffractive-refiective Gregorian type,the center obstruction is banished. Aberrations of Optical system are corrected by using binary optical element.The reflective surfaces are spherical,binary optical surface size is reduced to the l/4～1/3 of the Schmidt system corrector.By using OSLO 4.2 SIX (Sinclair Optics Inc,)optical design software,an off-axial infrared telescope with a refrative-diffrative surface,whose aperture φ120mm,effective focus length f=-1000mm,λ=4.3pm,field angle 2°×6°(tangential× sagittal directions),resolution.Res=0.05μm,modulation transfer function MTF≥0.4 (if spatial frequency≤10cl/mm).