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两块偏振片,很容易使它们的透光方向正交(消光)。但如果没有其他透光方向已知的偏振元件,如何确定它们的透光方向?下面提供一种简易方法。若如图1所示,起偏器透光方向P_1位于竖直方向上,检偏器透光方向P_2位于水平方向上(起偏器、检偏器都平行于纸面放置,光线由纸面向着观察者),则看到消光;若这时把起偏器或检偏器绕竖直轴翻转180°,则视场仍将保持消光。这一现象提供了起偏器和检偏器的
Two polarizers, it is easy to make their light transmission orthogonal (extinction). However, if there are no other polarizer elements with known directions of light transmission, how to determine their light transmission direction? The following provides a simple method. If, as shown in FIG. 1, the polarizer transmissive direction P_1 is in the vertical direction, the polarizer transmissive direction P_2 is in the horizontal direction (the polarizer and the analyzer are both arranged parallel to the paper surface and the light is directed from the paper surface Observer), extinction is seen; if the polarizer or analyzer is then flipped 180 ° about the vertical axis, the field of view will remain matted. This phenomenon provides the polarizer and analyzer