测量平板玻璃折射率实验中干涉条纹不清晰原因的探讨

Iscussion of unclear interference fringe in the experiment of measuring refractive index of plate glass

分析了利用分光仪测量平板玻璃折射率中条纹不清晰的原因,借助数值模拟得出与实验观测相同的干涉光强分布,明确了平板玻璃的楔角是干涉条纹不清晰的主要原因.通过对比不同楔角下条纹可见度随平板玻璃反射率的变化关系,确定了平板玻璃的最佳反射率为0.5至0.7之间,使学生在实验中可以观察到清晰的干涉条纹.

The reason of the emergence of unclear interference fringe in measurement of refractive index of plate glass using spectrometer is analyzed. According to the similar intensity distribution of simulation and observa- tion, the wedge angle of plate glass is the main cause. Based on the contrast of interference stripe varied by reflection of plate glass in different angles, to make sure the students could observe clear interference stripe, reflection of plate glass should be chosen between 0.5 and 0.7.