《光的干涉和干涉系统4.ppt

Since the interval between the two surfaces may be an actual plate or film, or it may be a gap between plates. We have four possibilities, as the following. Home Work (11-4) 1. An oil film (n=1.47, thickness 0.12?m) rests on a pool of water. If light strikes the film at an angle of 60o, what is the wavelength reflected in the first order? 2. When examining the surface of a polished workpiece in thallium light (535nm) , some scratch marks are seen where the fringes are distorted by 4/10 the distance between fringes. How deep are the scratches? P244 811 * 分光性质：振幅分割 工作原理： 两个干涉的点源： 两个反射面对S点的象S1和S2 第四节 平板的双光束干涉 S S 1 S 2 P M 1 M 2 n Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 1.条纹定域：能够得到清晰干涉条纹的区域。 一、干涉条纹的定域 2.平板干涉的优点，取 ，用面光源。 非定域条纹：在空间任何区域都能得到的干涉条纹。 定域条纹：只在空间某些确定的区域产生的干涉条纹。 点光源产生的非定域干涉 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 二、平行平板 (Plane-Parallel Plates) 干涉 （等倾干涉 Interference of equal inclination） 1.光程差计算 n n 2 1 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. n n ? phase change No phase change Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. ? No ? No ? No ? No ? ? ? ? Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 2.平板干涉装置 注意：采用扩展光源，条纹域在无穷远。 条纹成象在透镜的焦平面上。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 3、条纹分析(Fringes of equal inclination) l （光程差与条纹级数） ＝ 中心 l o m nh = + D 2 2 （ 最大干涉级在中心。 时最大， ＝ ）光程差在 q 0 2 1 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2