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Proceedings Paper

Terahertz spectroscopy properties of the selected engine oils
Author(s): Shouming Zhu; Kun Zhao; Tian Lu; Songqing Zhao; Qingli Zhou; Yulei Shi; Dongmei Zhao; Cunlin Zhang
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Paper Abstract

Engine oil, most of which is extracted from petroleum, consist of complex mixtures of hydrocarbons of molecular weights in the range of 250-1000. Variable amounts of different additives are put into them to inhibit oxidation, improve the viscosity index, decrease the fluidity point and avoid foaming or settling of solid particles among others. Terahertz (THz) spectroscopy contains rich physical, chemical, and structural information of the materials. Most low-frequency vibrational and rotational spectra of many petrochemicals lie in this frequency range. In recent years, much attention has been paid to the THz spectroscopic studies of petroleum products. In this paper, the optical properties and spectroscopy of selected kinds of engine oil consisting of shell HELIX 10W-40, Mobilube GX 80W-90, GEELY ENGINE OIL SG 10W-30, SMA engine oil SG 5W-30, SMA engine oil SG 10W-30, SMA engine oil SG 75W-90 have been studied by the terahertz time-domain spectroscopy (THz-TDS) in the spectral range of 0.6-2.5 THz. Engine oil with different viscosities in the terahertz spectrum has certain regularity. In the THz-TDS, with the increase of viscosity, time delay is greater and with the increase of viscosity, refractive indexes also grow and their rank is extremely regular. The specific kinds of engine oil can be identified according to their different spectral features in the THz range. The THz-TDS technology has potentially significant impact on the engine oil analysis.

Paper Details

Date Published: 4 November 2010
PDF: 6 pages
Proc. SPIE 7854, Infrared, Millimeter Wave, and Terahertz Technologies, 78540A (4 November 2010); doi: 10.1117/12.868883
Show Author Affiliations
Shouming Zhu, China Univ. of Petroleum (China)
Kun Zhao, China Univ. of Petroleum (China)
International Ctr. for Materials Physics (China)
Tian Lu, China Univ. of Petroleum (China)
Songqing Zhao, China Univ. of Petroleum (China)
Qingli Zhou, Capital Normal Univ. (China)
Yulei Shi, Capital Normal Univ. (China)
Dongmei Zhao, Capital Normal Univ. (China)
Cunlin Zhang, Capital Normal Univ. (China)

Published in SPIE Proceedings Vol. 7854:
Infrared, Millimeter Wave, and Terahertz Technologies
Cunlin Zhang; Xi-Cheng Zhang; Peter H. Siegel; Li He; Sheng-Cai Shi, Editor(s)

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