用改进的分光计测量光纤理论数值孔径

Measuring the numerical aperture of fiber by improved spectrometer

为测量光纤数值孔径,对分光计进行改动,将准直管和望远镜系统对调,使准直管可以绕中心轴转动,采用体积小亮度高的LED作光源,并将其固定在准直管进光孔的狭缝处,以产生可以转动的平行光.用改进后的分光计测量光纤的数值孔径,取得了满意的结果.该方法简单易行,特别适用于大学层次的物理实验.

The spectrometer is improved to measure the numerical aperture of fiber. The position of collimator and telescope are exchanged, so that the collimator can rotate around the central axis. LED with small size and high-brightness is fixed in the slit of the collimator to produce a rotatable parallel light. The improved method is simple and is applicable to the college physics experiment.