望远镜光轴与分光计主轴垂直的调节技巧

在分光计的调整实验中，最关键、最困难的步骤就是如何调整望远镜的光轴与仪器主轴垂直。若两个绿十字像相对于上十字叉丝水平线一上一下，称为异侧；若两个绿十字像都在上十字叉丝水平线的下侧或者上侧，称为同侧。针对以上两种情况，文章介绍了一种简单有效的方法：同侧异侧循环调节法，并给出了相应调整方法的完整流程图。用该方法可以快速调节望远镜光轴与仪器主轴垂直。教学实践表明：该方法便于学生记忆，大大优于传统方法的调节速度。

A Skill of Adjusting Optical Axis of Telescope Perpendicular to Central Axis of Spectrometer

The most crucial and difficult step in the experiment of spectrometer is to adjust optical axis of telescope perpendicular to central axis of spectrometer. Two eases are discussed, i.e. , two reflected cross--shaped images locate at different sides or the same side of the up horizontal line. Based on the two instances, a new method of cyclic adjusting is developed to solve this difficult problem, which proves to be easy and effective. In addition, a flow chart of adjusting telescope is presented. Our teaching practices show that the cyclic adjusting method is easier to be remembered by students and is much better than that of the classical method