提出了一种能同时测量波片延迟量大小和快慢轴方位的新方法。此方法是将待测波片置于起偏镜和检偏镜之间,通过计算机控制步进电机带动待测波片匀速旋转,对出射光的光强进行连续测量,得到出射光光强随时间变化曲线。分析实验曲线,可计算出波片的延迟量,同时也可确定波片快慢轴的方位。实验过程采用计算机控制,操作简单,并且在很大程度上消除了人眼分辨率有限和手动调节不精确带来的误差,因而具有较高的精度。

This paper brings forward a new method which can measure the phase delay and mark the placement of the fast and slow axis of wave plate at the same time. The measured wave plate is placed between polarizer and analyzer, and uniformly revolves under the control of stepping motor drived by computer. The curve of emergent light intensity vs time is obtained through continuous measuring the emergent light intensity. The phase delay can be calculated and the placement of the fast and slow axis of the wave plate can be marked after analyzing the curve. The process of experiment is controlled by computer, so the manipulation is sample, further more, it can avoid error originated from the limit of eyes′distinguishability and the inaccuracy of manual regulation, as a result, it has high degree of accuracy.