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Open AccessArticle

Terahertz Time Domain Spectroscopy to Detect Different Oxidation Levels of Diesel Engine Oil

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Department of Agricultural Machines and Equipment, College of Agricultural Engineering Sciences, University of Baghdad, Baghdad 10071, Iraq
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Faculty of Physics and Material Sciences Center, Philipps Universität Marburg, Renthof 5, 35032 Marburg, Germany
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Plant, Soil and Agricultural Systems, Southern Illinois University, Carbondale, IL 62901, USA
*
Author to whom correspondence should be addressed.
Lubricants 2019, 7(2), 18; https://doi.org/10.3390/lubricants7020018
Received: 18 January 2019 / Revised: 6 February 2019 / Accepted: 13 February 2019 / Published: 18 February 2019
Diesel engine oil was subjected to thermal oxidization (TO) for six periods of time (0 h, 24 h, 48 h, 72 h, 96 h, and 120 h) and was subsequently characterized by terahertz time domain spectroscopy (THz-TDS). The THz refractive index generally increased with oxidation time. The measurement method illustrated the potential of THz-TDS when a fixed setup with a single cuvette is used. A future miniaturized setup installed in an engine would be an example of a fixed setup. For the refractive index, there were highly significant differences among the oxidation times across most of the 0.3–1.7 THz range. View Full-Text
Keywords: terahertz spectroscopy; engine lubrication oil; oil condition; thermal oxidation terahertz spectroscopy; engine lubrication oil; oil condition; thermal oxidation
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MDPI and ACS Style

Abdul-Munaim, A.M.; Ornik, J.; Koch, M.; Watson, D.G. Terahertz Time Domain Spectroscopy to Detect Different Oxidation Levels of Diesel Engine Oil. Lubricants 2019, 7, 18.

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