关键词: 介电谱, 主成分分析, 偏最小二乘, 粘度, 定量

Abstract: Using dielectric spectroscopy (DS) to analyze petroleum products was introduced. Base on the principle component analysis method the differences between low grade and high grade automobile lube oils were identified. A model was set up using partial least squares (PLS) method to predict the viscosity values of lube oil at 40℃ and 100℃ rapidly. When the number of principle components reached 7, the predicted values and the actual measured data were in good agreement having correlation coefficient of 0.999 6 and 0.998 4 for 40℃ and 100℃, respectively; the average prediction error for 40℃ and 100℃ were 1.054 and 0.094 2, respectively. Results validated that the viscosity of lube oil could be measured by DS accurately and rapidly.

Key words: Dielectric Spectroscopy, Principle Component Analysis, Partial Least Square, Viscosity, Quantitative