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

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 il...

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Bibliographic Details
Main Authors: Ali Mazin Abdul-Munaim, Jan Ornik, Martin Koch, Dennis G. Watson
Format: Article
Language:English
Published: MDPI AG 2019-02-01
Series:Lubricants
Subjects:
Online Access:https://www.mdpi.com/2075-4442/7/2/18
Description
Summary: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.
ISSN:2075-4442