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尿素水溶液液膜厚度和浓度的定量分析对于与其相关的工业过程极为重要,传统的测量方法只能实现厚度和浓度的单独测量。提出了一种基于激光拉曼光谱技术同步测量尿素水溶液液膜厚度和浓度的方法。分别建立尿素水溶液的拉曼光谱特征峰(1004cm-1,N—C—N对称拉伸振动)相对强度与厚度、浓度的关系曲线,在此基础上建立了尿素水溶液液膜厚度与浓度反演的数学模型。研究结果表明,浓度一定时,强度与厚度(2~10mm)呈线性关系,厚度的平均测量误差为8.36%;液膜厚度一定时,强度与浓度(5%~40%,质量分数)呈线性相关,浓度的平均测量误差为6.24%。
Quantitative analysis of urea solution aqueous film thickness and concentration is of paramount importance to the industrial processes associated with it. Conventional measurement methods only allow for the separate measurement of thickness and concentration. A method based on laser Raman spectroscopy to measure the thickness and concentration of liquid film of urea aqueous solution simultaneously was proposed. The relationship curves between the relative intensities of Raman spectra (1004cm-1, N-C-N symmetrical stretching vibration) and the thickness and concentration of Raman spectra of urea aqueous solution were established respectively. Based on this, Mathematical model. The results show that the intensity is linear with the thickness (2 ~ 10mm) at a certain concentration, and the average measurement error is 8.36%. When the film thickness is constant, the intensity and concentration (5% ~ 40%, mass fraction) Correlation, the average concentration of the measurement error is 6.24%.