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Frontiers of Optoelectronics

Front Optoelec    2012, Vol. 5 Issue (2) : 214-217     DOI: 10.1007/s12200-012-0227-4
Optical property of biodiesel and its base stock in terahertz region
Hui ZHAO1, Kun ZHAO1,2(), Lu TIAN1, Qing MIAO1, Hao NI1
1. Laboratory of Optic Sensing and Detecting Technology, College of Science, China University of Petroleum, Beijing 102249, China; 2. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
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Biodiesel is the product of catalysed transesterification reaction, in which fatty acid is transformed to fatty acid methyl ester (FAME), named biodiesel. The frequency-dependent absorption and refractive characters of biodiesels and its base stocks have been researched in the spectral range of 0.2-1.5 THz by terahertz time-domain spectroscopy (THz-TDS). The biodiesels showed higher absorption value than those of its base stocks because of the concomitant, and the increasing of absorption coefficients of three biodiesels differed with the different transesterification technology. The results suggested that THz-TDS can be a promising method to the quality control and ester transfer efficiency analysis of biodiesel.

Keywords terahertz time-domain spectroscopy (THz-TDS)      biodiesel(BD)      fatty acid methyl ester (FAME)     
Corresponding Authors: ZHAO Kun,   
Issue Date: 05 June 2012
 Cite this article:   
Hui ZHAO,Kun ZHAO,Lu TIAN, et al. Optical property of biodiesel and its base stock in terahertz region[J]. Front Optoelec, 2012, 5(2): 214-217.
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Fig.1  THz pulses of reference, BDs and its base stocks
Fig.2  Absorption coefficients of samples in 0.2-1.6 THz
Fig.3  Calculated absorption characters of FAMEs and FAs with carbon number from 12 to 18 at 0.2-1.6 THz
Fig.4  Refractive indexes of samples in 0.2-1.6 THz
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