TY  - CHAP
U1  - Konferenzveröffentlichung
A1  - Ortega Clavero, Valentin
A1  - Weber, Andreas
A1  - Schröder, Werner
A1  - Curticapean, Dan
A1  - Meyrueis, Patrick L.
A1  - Javahiraly, Nicolas
ED  - Lehmann, Peter H.
ED  - Osten, Wolfgang
ED  - Albertazzi, Armando
T1  - Spectral monitoring of toluene and ethanol in gasoline blends using Fourier-Transform Raman spectroscopy
T2  - Proceedings of SPIE: Optical Measurement Systems for Industrial Inspection VIII
N2  - The combination of fossil-derived fuels with ethanol and methanol has acquired relevance and attention in several countries in recent years. This trend is strongly affected by market prices, constant geopolitical events, new sustainability policies, new laws and regulations, etc. Besides bio-fuels these materials also include different additives as anti-shock agents and as octane enhancer. Some of the chemical compounds in these additives may have harmful properties for both environment and public health (besides the inherent properties, like volatility). We present detailed Raman spectral information from toluene (C7H8) and ethanol (C2H6O) contained in samples of ElO gasoline-ethanol blends. The spectral information has been extracted by using a robust, high resolution Fourier-Transform Raman spectrometer (FT-Raman) prototype. This spectral information has been also compared with Raman spectra from pure additives and with standard Raman lines in order to validate its accuracy in frequency. The spectral information is presented in the range of 0 cm-1 to 3500 cm-1 with a resolution of 1.66cm-1. This allows resolving tight adjacent Raman lines like the ones observed around 1003cm-1 and 1030cm-1 (characteristic lines of toluene). The Raman spectra obtained show a reduced frequency deviation when compared to standard Raman spectra from different calibration materials. The FT-Raman spectrometer prototype used for the analysis consist basically of a Michelson interferometer and a self-designed photon counter cooled down on a Peltier element arrangement. The light coupling is achieved with conventional62.5/125μm multi-mode fibers. This FT-Raman setup is able to extract high resolution and frequency precise Raman spectra from the additives in the fuels analyzed. The proposed prototype has no additional complex hardware components or costly software modules. The mechanical and thermal disturbances affecting the FT-Raman system are mathematically compensated by accurately extracting the optical path information of the Michelson interferometer. This is accomplished by generating an additional interference pattern with a λ = 632.8 nm Helium-Neon laser (HeNe laser). It enables the FT-Raman system to perform reliable and clean spectral measurements from the materials under observation.
KW  - Spektroskopie
KW  - Kraftstoff
Y1  - 2013
U6  - https://doi.org/10.1117/12.2020780
DO  - https://doi.org/10.1117/12.2020780
VL  - 8788
SP  - 878834-1
EP  - 878834-8
PB  - SPIE
CY  - Bellingham, Washington
ER  -