Determination of water in lubricating oils by mid- and near-infrared spectroscopy

Blanco, M.; Coello, J.; Iturriaga, H.; Maspoch, S.; González, R.

doi:10.1007/bf01243055

Cited by 26 publications

(17 citation statements)

References 8 publications

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“…Sensor systems researched have included infrared [2][3][4], hyperspectral [5], resonating [6][7][8][9][10], and electrochemical [11][12][13][14][15][16]. These sensors have attempted to monitor oil conditions such as viscosity [7,8,12,17]; acidity [6,[14][15][16]18]; fuel, water, or antifreeze contamination [3]; and antioxidants [11,13].…”

Section: Introductionmentioning

confidence: 99%

Distinguishing Gasoline Engine Oils of Different Viscosities Using Terahertz Time-Domain Spectroscopy

Adbul-Munaim

Reuter

Koch

et al. 2015

J Infrared Milli Terahz Waves

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THz-TDS in the range of 0.5-2.0 THz was evaluated for distinguishing among gasoline engine oils of three different grades from the same manufacturer. Absorption coefficient showed limited potential and only distinguished (p < 0.05) the 20W-50 grade from the other two grades in the 1.7-2.0 THz range. Refractive index data demonstrated relatively flat and consistently spaced curves for the three oil grades. ANOVA results confirmed a highly significant difference (p < 0.0001) in refractive index among each of the three oils across the 0.5 -2.0 THz range. Linear regression was applied to refractive index data at 0.25 THz intervals from 0.5 -2.0 THz to predict kinematic viscosity. All seven linear regression models, intercepts, and refractive index coefficients were highly significant (p < 0.0001). All models had a similar fit with R 2 ranging from 0.9773 to 0.9827 and RMSE ranging from 6.33 to 7.75.The refractive indices at 1.25 THz produced the best fit. The refractive indices of these oil samples were promising for identification and distinction of oil grades.

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Section: Introductionmentioning

confidence: 99%

Distinguishing Gasoline Engine Oils of Different Viscosities Using Terahertz Time-Domain Spectroscopy

Adbul-Munaim

Reuter

Koch

et al. 2015

J Infrared Milli Terahz Waves

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“…Sensor systems studied have included electromechanical (Cheek and Mowery, 1989;Duchowski and Mannebach, 2006;Price and Clarke, 1991;Soleimani et al, 2013;Wang et al, 1994;Wang, 2002) and resonating sensors (Agoston et al, 2005;Jakoby et al, 2003;Milpied et al, 2010;Mohammed and Hassan, 2013). Infrared (Blanco et al, 1998;Borin and Poppi, 2005;Kasberger et al, 2011) and hyperspectral (Lulu et al, 2014) spectroscopy techniques have also been used. The oil conditions these sensors attempted to monitor were acidity (Agoston et al, 2005;Moon et al, 2006;Soleimani et al, 2013;Wang et al, 1994;Wang, 2002), antioxidants (Cheek and Mowery, 1989;Price and Clarke, 1991), viscosity (Duchowski and Mannebach, 2006;Jakoby et al, 2003;Schmitigal and Moyer, 2005), and contaminants of fuel, water, or antifreeze (Borin and Poppi, 2005).…”

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confidence: 99%

Using Terahertz Time-Domain Spectroscopy to Discriminate among Water Contamination Levels in Diesel Engine Oil

2016

Trans. ASABE

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“…Lubricating oils [1], most of which are obtained from petroleum, consist of complex mixtures of hydrocarbons of molecular weights in the range of 250-1000. Lube base oil (LBO) is one of the most popular petroleum products.…”

Section: Introductionmentioning

confidence: 99%

The detection and identification of selected lube base oil using terahertz time-domain spectroscopy

et al. 2009

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Using the terahertz time-domain spectroscopy (THz-TDS), the frequency-dependent absorption coefficient(s) and refractive index (indices) of selected lube base oil (LBO) were extracted in the spectral range of 0.3-1.6 THz. The selected LBO was also characterized by near-infrared spectrum. The experimental results reveal that LBO is more sensitive in the THz range than near-infrared, and the different viscosity index of LBO can be identified according to their different spectral features in THz range. Due to better repeatability, shorter testing time, and easy operation, THz-TDS can be used as a complementary for identifying the chemical composition of LBO.

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Determination of water in lubricating oils by mid- and near-infrared spectroscopy

Cited by 26 publications

References 8 publications

Distinguishing Gasoline Engine Oils of Different Viscosities Using Terahertz Time-Domain Spectroscopy

Distinguishing Gasoline Engine Oils of Different Viscosities Using Terahertz Time-Domain Spectroscopy

Using Terahertz Time-Domain Spectroscopy to Discriminate among Water Contamination Levels in Diesel Engine Oil

The detection and identification of selected lube base oil using terahertz time-domain spectroscopy

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