Film thickness measurement of aqueous solution based on single diode laser absorption spectroscopy

被引：0

作者：

Liu C. ^{[1
]}

Tian J. ^{[1
]}

Ding J. ^{[1
]}

Guo X. ^{[1
]}

Shi J. ^{[1
]}

Yang H. ^{[1
]}

Cai X. ^{[1
]}

机构：

[1] Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai

来源：

Yang, Huinan (yanghuinan@usst.edu.cn) | 1600年 / Central South University of Technology卷 / 47期

基金：

中国国家自然科学基金; 高等学校博士学科点专项科研基金;

关键词：

Absorption spectroscopy; Evaporation; Liquid film of aqueous solution; Measurement; Thickness;

D O I：

10.11817/j.issn.1672-7207.2016.01.039

中图分类号：

学科分类号：

摘要：

A novel method was proposed to determine liquid film thickness of urea-water solutions at different mass fractions. The wavenumber position at 6 613.25 cm-1 was chosen, where the derivative of the absorption coefficient of urea-water solutions with respect to mass concentration was zero. A single diode laser absorption spectroscopy (DLAS) sensor was developed to obtain liquid film thickness of urea-water solutions. The measurement accuracy of this method was validated with a calibration tool with which liquid film thickness can be adjusted from 0 to 1 mm. Furthermore, the evaporation process of liquid film of urea-water solutions on transparent quartz plate at room temperature was also studied. The results show that average relative error between the measured thickness and known liquid film thickness is about 1.50%,and the standard deviation of film thickness is less than 24.68 μm for three repeated experiments. The evaporation rate of film thickness is large at the beginning of film evaporation process, and it keeps constant in the middle of the film evaporation process. However, at the end of the evaporation process, strong fluctuation of the film thickness occurs because of the serious beam steering effect. © 2016, Central South University of Technology. All right reserved.

引用

页码：286 / 289

页数：3

共 20 条

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