激光光谱法尿素水溶液液膜多参数同步测量

对溶液液膜温度、厚度和浓度进行定量分析对与之相关的工业过程至关重要,对其机理的研究中它们互相耦合,而传统的测量方法只能实现液膜的温度、厚度和浓度的单独测量。本文基于比尔-朗伯定律,提出一种尿素水溶液液膜的温度、厚度和浓度同步测量新方法,通过结合3个波长1 420、1 488和1 531 nm的激光,建立了尿素水溶液液膜的温度、厚度和浓度的同步反演模型。在此基础上,利用1 mm温控样品池验证了该方法的测量精度,结果表明,该方法测量尿素水溶液液膜厚度的平均误差为0.51%,液膜温度的平均误差为2.59%,液膜浓度的平均误差为6.32%。

Simultaneous measurement of multi-parameter of liquid film for urea-water-solution by laser spectroscopy

Quantitative analysis of liquid film temperature, thickness and mass fraction is extremely crucial to the relevant industrial processes, and these parameters are mutually coupled in the study of the mechanism for heat transfer. Temperature, thickness and mass fraction of liquid film, however, can only be determined individually by conventional measurement techniques. In this paper, a novel measurement method based on Beer-Lambert law to measure the film temperature, thickness and mass fraction of urea-water-solution simultaneously was developed by combining three lasers with different wavelengths:1 420, 1 488 and 1 531 nm. In addition, measurement accuracy of this method was validated by a sample cell with controlled temperature and 1 mm optical path length. The experimental results reveal that average relative errors of thickness, temperature and mass fraction of urea-water-solutions measured by the developed method are 0.51%, 2.59% and 6.32%, respectively.