22 June 2015 Potential use of the characteristic Raman lines of toluene (C7H8 ) as a reference on the spectral analysis of fuel blends
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We report the use of the Raman spectral information of the chemical compound toluene C7H8 as a reference on the analysis of laboratory-prepared and commercially acquired gasoline-ethanol blends. The rate behavior of the characteristic Raman lines of toluene and gasoline has enabled the approximated quantification of this additive in commercial gasoline-ethanol mixtures. This rate behavior has been obtained from the Raman spectra of gasoline-ethanol blends with different proportions of toluene.

All these Raman spectra have been collected by using a self-designed, frequency precise and low-cost Fourier-transform Raman spectrometer (FT-Raman spectrometer) prototype. This FT-Raman prototype has helped to accurately confirm the frequency position of the main characteristic Raman lines of toluene present on the different gasoline-ethanol samples analyzed at smaller proportions than those commonly found in commercial gasoline-ethanol blends. The frequency accuracy validation has been performed by analyzing the same set of toluene samples with two additional state-of-the-art commercial FT-Raman devices. Additionally, the spectral information has been contrasted, with highly-correlated coefficients as a result, with the values of the standard Raman spectrum of toluene.
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Valentin Ortega Clavero, Valentin Ortega Clavero, Andreas Weber, Andreas Weber, Werner Schröder, Werner Schröder, Dan Curticapean, Dan Curticapean, } "Potential use of the characteristic Raman lines of toluene (C7H8 ) as a reference on the spectral analysis of fuel blends", Proc. SPIE 9525, Optical Measurement Systems for Industrial Inspection IX, 95254G (22 June 2015); doi: 10.1117/12.2185100; https://doi.org/10.1117/12.2185100

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