扩散
光学
泰勒分散
折射率
热扩散率
度量(数据仓库)
材料科学
全息干涉法
全息术
色散(光学)
质量扩散率
干涉测量
有效扩散系数
扩散过程
反常扩散
镜头(地质)
分子扩散
物理
热力学
计算机科学
公制(单位)
创新扩散
经济
磁共振成像
放射科
数据库
医学
知识管理
运营管理
作者
Liangling Sun,Weidong Meng,Ximing Pu
出处
期刊:Optics Express
[The Optical Society]
日期:2015-08-25
卷期号:23 (18): 23155-23155
被引量:14
摘要
A novel optical method was applied to measure the binary liquid diffusion coefficient (D) quickly. Equipped with an asymmetric liquid-core cylindrical lens (ALCL), the spatially resolving ability of the ALCL in measuring refractive index of liquid was utilized to obtain the gradient distribution of the liquid concentration along diffusive direction. Based on Fick's second law, the D value was then calculated by analyzing diffusion images. It was worth mentioning that only one instantaneous diffusive image was required to measure D value by the method, reducing the measurement time greatly from several hours in traditional methods to a few seconds. The diffusion coefficients of ethylene glycol diffusing in pure water, at temperatures from 288.15 to 308.15 K, were measured by analyzing instantaneous diffusion images, the results were consistent well with the values measured by using holographic interferometry and Taylor dispersion methods. The method is characterized by faster measurement, direct observation of diffusive process, and easy operation, which provides a new method in measuring diffusion coefficient of liquids rapidly.
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