【摘要】 本文给出了为中国的2.16米望远镜设计的三种消大气色散主焦点改正器。视场为2°,可产生的最大色散为6"。三种结构均给出非常好的成象成量。主光线与光轴的夹角也很小。工艺上没有特别困难的问题。这些设计不仅可用于2.16米望远镜,对其它大望远镜也是很有意义的。更多还原

【Abstract】 This paper introduces three types of primary correctors for the Chinese 2.16 m telescope. Each corrector has a 2-degree field and can be used to compensate the atmospheric dispersion of 6". The primary mirror of the telescope is a 2.16 m hyperboloid with ellipticity 1.0951347 and f-ratio of 3. The first corrector consists of 4 elements, all of their surfaces being spherical. The second corrector also consists of 4 elements, one of which is an ellipsoid. The third one consists of three elements, for which two kinds of structure parameters and the relevant results are given. Lens-prisms (lensms) are used to compensate the atmospheric dispersion. These three types of correctors have similar performances: The maximum element is about 52 cm, and the maximum lensm about 38 cm. the maximum image spread 1.6" and the maximum principal ray angle 1°36’. For each corrector, the spread diagrams under the maximum dispersion and zero dispersion states are given.更多还原