液晶空间光调节杨氏双缝干涉法透明介质折射率的优化测量  

Optimal Measurement of Refractive Index of Transparent Medium by Young’s Double Slit Interferometry with Liquid Crystal Spatial Light Adjustment

作　　者：陈水桥[1] 蔡力 陈丰 陈志博 苏婷琳 颜欣 张作成 CHEN Shuiqiao;CAI Li;CHEN Feng;CHEN Zhibo;SU Tinglin;YAN Xin;ZHANG Zuocheng(Physics College of Zhejiang University,Hangzhou 310027,China;Chu Kochen College of Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学物理学院,浙江杭州310027 [2]浙江大学竺可桢学院,浙江杭州310027

出　　处：《大学物理实验》2022年第3期41-46,共6页Physical Experiment of College

基　　金：浙江大学高等教育“十三五”教学改革研究项目(zdjg19031)。

摘　　要：在传统的杨氏双缝干涉实验中,受限于双缝的机械化加工精度,双缝干涉光路与理论相比偏差较大,得益于液晶光阀良好的光学性能,实现了双缝电子化,即电脑显示器的图像转化为电压信号控制液晶光阀,从而模拟出可自由调节大小的高精度双缝。进而研究了电子化双缝的干涉光路经过透明介质后的干涉条纹间距的变化,进而推导出了透明介质折射率与干涉条纹间距的关系式。为优化测量利用CCD采集到的图像信息,采用photoshop处理图像,并通过显示屏像素点的间距计算得到放大系数,从而测定相应的条纹的实际间距,提高了实验数据采样的精度。最后运用数理方法分析了测量误差。In the traditional Young’s double slit interference experiment,limited by the mechanized machining accuracy of the double slit,the double slit interference optical path has a large deviation compared with the theory.Thanks to the good optical performance of the liquid crystal light valve,the double slit electronization is realized,that is,the image of the computer display is transformed into a voltage signal to control the liquid crystal light valve,so as to simulate a high-precision double slit with freely adjustable size.Furthermore,the change of interference fringe spacing after the electronic double slit interference light path passes through the transparent medium is studied,and the relationship between the refractive index of the transparent medium and the interference fringe spacing is derived.In order to optimize the measurement,the image information collected by CCD is used,the image is processed by Photoshop,and the magnification factor is calculated through the spacing of pixels on the display screen,so as to determine the actual spacing of corresponding stripes and improve the accuracy of experimental data sampling.Finally,the measurement error is analyzed by mathematical method.

关 键 词：液晶光阀 电子化双缝 PHOTOSHOP图像处理 介质折射率 

分 类 号：O423[理学—声学]