分光仪十字像调节过程的光路分析

Analysis on optical path for crisscross image in spectrometer during adjustment process

为加强学生对分光仪调节和使用的理解,结合光路分析,对平面镜和望远镜主光轴之间夹角与十字像在分划板上位置的关系进行了分析,在此基础上证明了"二分之一"调节法在分光仪调节中的必要性,并分析了在实际的操作中,未能准确实现十字像上升或下降"二分之一"对于分光仪调节的影响。最后,针对平面镜一个镜面反射回的十字像可以在分划板上看到,而另一个镜面的十字像无法找到这一实验中常见的现象进行分析,并提出解决方法。

In order to give students a better understanding of the adjustment and usage of spectrome- ter, the relationship between the position of crisscross image and the included angle of plane mirror with principal optic axis of telescope has been analyzed by using the optical path diagram. Based on the optical path analysis, it is proved that the ＂Half Adjustment Method＂ is necessary for the adjustment of the spectrometer. Influence of the accuracy of ＂Hail Adjustment＂ during the actual operation on the spectrometer adjustment has also been analyzed. In addition, the reason as well as an effective solution for the case of only one crisscross image is visible on the reticle has been proposed.