食用油折射率的光干涉快速测量方法

摘要

折射率是食用油品质的一项重要指标.为测量食用油折射率,基于泰曼-格林干涉仪,在室温20℃、光源波长632.8 nm条件下,通过面阵CCD相机拍照获取食用油的干涉条纹图像,并利用图像处理技术,快速测量出不同食用油样品干涉条纹的移动量,进而求得其折射率.对几种常见的食用油进行了测量,得到花生油、玉米油、大豆油、菜籽油、橄榄油以及葵花和玉米油1∶1混合后的折射率分别为1.470 9、1.473 5、1.472 9、1.471 8、1.469 4、1.473 8.结果表明,利用该方法能够对食用油折射率进行快速测定,同时实验结果精度高,能为食用油品质及地沟油的现场检测提供一种简便有效的手段.%Refractive index,an important indicator of edible oil quality,has been measured by using Tyman-Green interferometer at room temperature of 20 ℃ under the condition of light wavelength 632.8 nm.The interference fringe image of thin oil was obtained by using CCD camera.With the assistance of image processing technology,the movement of interference fringes could be quickly measured,and then the refractive index of different kinds of edible oil could be calculated.This method provides a convenient and effective way for testing edible oil quality.