大F数高分辨率空间望远镜光学系统

Investigation on space optical system of high F number and high resolution

针对离轴三反射镜光学系统,分析了改变入射光的平均波长时,大F数望远镜系统在奈奎斯特频率处实验室静态传递函数的变化规律,进而论证了大F数望远镜的可行性。分析结果表明:对于大F数空间望远镜,其入射光平均波长愈短,它的传递函数值愈高,愈能满足对地面分辨率的要求,该结论可作为研制轻型空间望远镜的参考。

Space telescope with high F number can satisfy the requirements that the optical system should have the characteristics of high resolution and light weight. In this paper,we describe a uncoaxial three mirror system simply and discuss on the rule of variation of laboratory static Modulation Transfer Function（MTF） at Nyquist frequency of the optical system with average wavelength of incident rays. Accordingly, the feasibility of telescope with big F number is analyzed. It is shown that the shorter average wavelength of incident rays and the higher MTF are; the better satisfaction ground resolution requires, which will offer the reference to the lightweight space telescope.