| ATOMIC AND MOLECULAR PHYSICS |
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Quantitative Analysis for Monitoring Formulation of Lubricating Oil Using Terahertz Time-Domain Transmission Spectroscopy |
| TIAN Lu 1,2,ZHAO Kun1,2,3**,ZHOU Qing-Li4,SHI Yu-Lei4,ZHANG Cun-Lin4 |
1State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249
2Laboratory of Optic Sensing and Detecting Technology, China University of Petroleum, Beijing 102249
3International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016
4Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Key Laboratory of Terahertz Optoelectronics (Ministry of Education), Department of Physics, Capital Normal University, Beijing 100048 |
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| Cite this article: |
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TIAN Lu, ZHAO Kun, ZHOU Qing-Li et al 2012 Chin. Phys. Lett. 29 043901 |
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Abstract The quantitative analysis of zinc isopropyl-isooctyl-dithiophosphate (T204) mixed with lube base oil from Korea with viscosity index 70 (T204-Korea70) is presented by using terahertz time-domain spectroscopy (THz-TDS). Compared with the middle-infrared spectra of zinc n-butyl-isooctyl-dithiophosphate (T202) and T204, THz spectra of T202 and T204 show the weak broad absorption bands. Then, the absorption coefficients of the T204-Korea70 system follow Beer's law at the concentration from 0.124 to 4.024%. The experimental absorption spectra of T204-Korea70 agree with the calculated ones based on the standard absorption coefficients of T204 and Korea70. The quantitative analysis enables a strategy to monitor the formulation of lubricating oil in real time.
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Received: 31 August 2011
Published: 04 April 2012
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| PACS: |
39.30.+w
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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89.30.Aa
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