中南大学学报（自然科学版）Issue(1)：286-289,4.DOI:10.11817/j.issn.1672-7207.2016.01.039
单波长溶液液膜厚度测量方法
Film thickness measurement of aqueous solution based on single diode laser absorption spectroscopy
摘要
Abstract
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.关键词
溶液液膜/测量/厚度/吸收光谱/蒸发Key words
liquid film of aqueous solution/measurement/thickness/absorption spectroscopy/evaporation分类
能源科技引用本文复制引用
刘畅,田井辉,丁家琦,郭晓龙,石建伟,杨荟楠,蔡小舒..单波长溶液液膜厚度测量方法[J].中南大学学报（自然科学版）,2016,(1):286-289,4.基金项目
国家自然科学基金资助项目(51306123)；博士点基金联合资助课题(20133120120008)(Project(51306123) supported by the National Natural Science Foundation of China （51306123）
Project(20133120120008) supported by the Joint Specialized Research Found for the Doctoral Program of Higher Education) （20133120120008）
