由两块拼接反射镜组成的光学系统的衍射能量分布

LAMOST的光学系统由反射施密特改正板MA 和球面主镜MB 组成 ,MA 和MB 均为对角径 1 .1m的六角形子镜的拼镜面 .本文计算了星在子午圈上时望远镜观测不同的天区零视场和有视场时的光学系统衍射能量分布 ,还计算了MA 不变MB 改为整块的 6m镜以及MA 和MB 均为对角径 1 .5m的六角形子镜的拼镜面的衍射能量分布 .对这些计算结果进行分析 ,论证了六角形子镜尺寸选择的合理性

The Diffraction Energy Distribution of an Optical System with Two Segmented Mirrors

The optical system of LAMOST consists of a reflecting Schmidt correcting plate M A and a spherical primary mirror M B . Both M A and M B are segmented mirrors. Each segment is a hexagonal sub mirror with a 1.1 m diagonal. This paper calculates the detailed diffraction energy distribution of the optical system in observing different sky areas and fields when the star is on the meridian. It also calculates the diffraction energy distribution of the optical system when M B is a single 6 m mirror while M A is kept unchanged and when each segment of M A and M B is a 1.5 m hexagonal sub mirror. Through analyzing the calculations, the reason of the sub mirror size selection is justified.