【摘要】 提出了一种基于迈克尔逊干涉仪的LED光源干涉精确测量透明液体折射率的方法.采用绿色LED光源，阐述了LED绿光干涉测量液体折射率的原理.如果参考光路和测量光路光程相等，会观察到干涉条纹，干涉条纹中心即“零光程差”的标杆，由比色皿上下两部分分别出现干涉条纹时的读数差，即动镜发生的位移，计算溶液折射率.测量结果表明，测量值与用阿贝折射计的测量值相比误差小于0.5%.利用迈克尔逊干涉仪测量液体折射率的实验，对培养大学生动手能力和创新思维有重要意义.更多还原

【Abstract】 A method based on Michelson interferometer to accurately measure the refractive index of transparent liquid by LED light source interference is introduced.Using green LED light source, the principle of measuring the refractive index of liquid by LED green light interference is expounded.If the optical paths of the reference optical path and the measuring optical path are equal, interference fringes will be observed, and the center of interference fringes is the benchmark of “zero optical path difference”.The reading difference when interference fringes appear in the upper and lower parts of the cuvette respectively, that is, the displacement of the moving mirror, is recorded to calculate the refractive index of the solution.Compared with the measured value with Abbe refractometer, the error is less than 3%.Using Michelson interferometer to measure the refractive index of liquid is of great significance to cultivate college students’ practical ability and innovative thinking.更多还原