提高平板玻璃折射率测量实验中干涉条纹清晰度的方法

Method for improving the clarity of interference fringe in measuring refractive index of glass plate

用分光仪测量平板玻璃折射率时,如果钠光偏离玻璃法线约25°斜入射,则能观察到清晰的干涉条纹.对上述现象分析,发现其原因在于平板玻璃透射光干涉条纹的衬比度低于反射光干涉条纹的对比度.进而,基于上述分析设计了测量平板玻璃折射率的改进方法.

In measuring the refractive index of glass plate with spectrometer,the experimentally clear fringes could be observed when the sodium line was slanted at 25 degrees to the glass plate.The reason was that the contrast ratio of interference fringes in the transmission light was lower than that in the reflected light.Based on the analysis,the improved experimental method was designed for measuring the refractive index of glass plate.