Near Infrared Spectroscopy Study on Water Content in Turbine Oil
CHEN Bin, LIU Ge, ZHANG Xian-ming
Engineering Research Centre for Waste Oil Recovery Technology and Equipment, Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, China
Abstract：Near infrared (NIR) spectroscopy combined with successive projections algorithm (SPA) was investigated for determination of water content in turbine oil. Through the 57 samples of different water content in turbine oil scanned applying near infrared (NIR) spectroscopy, with the water content in the turbine oil of 0～0.156%, different pretreatment methods such as the original spectra, first derivative spectra and differential polynomial least squares fitting algorithm Savitzky-Golay (SG), and successive projections algorithm (SPA) were applied for the extraction of effective wavelengths, the correlation coefficient (R) and root mean square error (RMSE) were used as the model evaluation indices, accordingly water content in turbine oil was investigated. The results indicated that the original spectra with different water content in turbine oil were pretreated by the performance of first derivative +SG pretreatments, then the selected effective wavelengths were used as the inputs of least square support vector machine (LS-SVM). A total of 16 variables selected by SPA were employed to construct the model of SPA and least square support vector machine (SPA-LS-SVM). There is 9 as The correlation coefficient was 0.975 9 and the root of mean square error of validation set was 2.655 8×10-3 using the model，and it is feasible to determine the water content in oil using near infrared spectroscopy and SPA-LS-SVM, and an excellent prediction precision was obtained. This study supplied a new and alternative approach to the further application of near infrared spectroscopy in on-line monitoring of contamination such as water content in oil.
Key words：Near infrared spectroscopy;Water content in oil;Successive projections algorithm;Least square support vector machine (LS-SVM) model
陈 彬，刘 阁，张贤明 . 汽轮机油中含水量的近红外光谱研究 [J]. 光谱学与光谱分析, 2013, 33(11): 2959-2963.
CHEN Bin, LIU Ge, ZHANG Xian-ming . Near Infrared Spectroscopy Study on Water Content in Turbine Oil . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(11): 2959-2963.
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