牛顿环条纹宽度与可见度的研究

Research on Width and Visibility of Newton’s Ringlike Stripes

为了更深刻地认知牛顿环条纹,推导了牛顿环条纹的宽度公式;分析了当折射率N增加时相邻两级亮、暗条纹的距离都会减小的原因;研究了同一波长对应的同一级亮、暗条纹的宽度的差异;论证了明、暗条纹的宽度都会随级数k增加而减小的规律;比较了用钠光灯测量平凸透镜的曲率半径R时两种处理双波长问题的方法;讨论了钠光灯双波长对条纹可见度的影响;最后指出了牛顿环条纹可见度最小时对应的级数k是平凸透镜曲率半径R的函数。

In order to recognize Newton＇ s ringlike stripes more deeply, the width formulas of Newton＇ s ring- like stripes are derived. When refractive index N increases, the distances between the adjacent bright and dark stripes all decrease , and the reason is analyzed. The width differences between the same level bright and dark stripes corresponding to the same wavelength are studied. The law that the widths of bright and dark stripes will de- crease with the increasing of the series k is proved. Two kinds of the data processing methods of double wave- lengths when the curvature radius R of a piano-convex lens is measured by a sodium-vapor light are compared. And the issue how the visibility of stripes is influenced by a sodium-vapor light is discussed. Finally, the result that the corresponding series k is a function of the curvature radius R of a planoconvex lens is pointed out.