Spectroscopy and Spectral Analysis, Volume. 30, Issue 9, 2496(2010)
Determination of Dynamic Viscosity of Automobile Lubricant Using Visible and Near Infrared Spectroscopy
Visible and near infrared (Vis/NIR) spectroscopy was applied for the fast determination of dynamic viscosity of automobile lubricant. One hundred fifty samples from 5 brands were collected for Vis/NIR spectral scanning. Partial least squares (PLS) analysis was applied as calibration method after preprocessing stage as well as a way to extract the first 6 principal components which were used as the input data matrix of least squares-support vector machine (LS-SVM) to develop the LS-SVM models. Radial basis function was used as core function with γ equal to 27.321 2 and σ2 equal to 3.229 5. The calibration set was composed of 125 samples, whereas 25 samples were in the validation set. The results indicated that LS-SVM model achieved the best prediction performance. A new process is proposed in this paper for determination of dynamic viscosity of automobile lubricant.
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ZHAO Zhao, LI Xia, YIN Ye-biao, TANG Jin, ZHOU Sheng-bin. Determination of Dynamic Viscosity of Automobile Lubricant Using Visible and Near Infrared Spectroscopy[J]. Spectroscopy and Spectral Analysis, 2010, 30(9): 2496