Refine
Year of publication
- 2015 (3) (remove)
Document Type
Conference Type
- Konferenzartikel (1)
Has Fulltext
- no (3)
Is part of the Bibliography
- yes (3) (remove)
Keywords
- Raman-Spektroskopie (3)
- FT-Raman spectroscopy (1)
- HeNe laser (1)
- Optical metrology (1)
- Produktion (1)
- Qualitätssicherung (1)
- Spektralanalyse (1)
- Vergleich (1)
- cyclohexane (1)
- fourier-Transformation (1)
Institute
Open Access
- Closed Access (2)
- Open Access (1)
The Raman spectra from the chemical compounds toluene and cyclohexane obtained using a Fourier Transform (FT)-Raman spectrometer prototype have been contrasted with the Raman spectra of these same materials collected with two different commercial FT-Raman devices. The FT-Raman spectrometer consist of a Michelson interferometer, a self-designed photon counter and a reference photo-detector. The evaluation methodology of the spectral information, contrary to the commercial devices that commonly use the zero-crossing method, is carried out by re-sampling the Raman scattering and by accurately extracting the optical path information of the Michelson interferometer. The FTRaman arrangement has been built using conventional parts without disregarding the spectral frequency precision that usually such a FTRaman instruments deliver. No additional complex hardware components or costly software modules have been included in this FT-Raman device. The main Raman lines from the spectra obtained with the three FT-Raman devices have been compared with the Raman lines from the standard Raman spectra of these two materials. The values obtained using the FT-Raman spectrometer prototype have shown a frequency accuracy comparable to that obtained with the commercial devices without facing the need for a large investment. Although the proposed FT-Raman prototype cannot be directly compared to the last generation of FT-Raman spectrometers from the commercial manufacturers, such a device could give an opportunity to users that require high frequency precision in their spectral analysis and are provided with rather scarce resources.
La industria del bacanora en Sonora, México, enfrenta la influencia de una compleja red de factores culturales, tecnológicos, económicos y legales que inhiben su desarrollo. Ello ocurre pese al esfuerzo institucional por radicar un marco normativo que elimine la práctica de los métodos informales de elaboración que derivan en calidades heterogéneas de licor. El conseguirlo se complica ante la dificultad que enfrentan los actores de esta industria para implementar prácticas efectivas de verificación de las normas vigentes en los confines de la geografía de la Denominación de Origen. En este documento se describe el uso de un prototipo de espectrómetro Raman por transformada de Fourier para analizar cualitativamente muestras desconocidas de bacanora. Este dispositivo se construyó con el uso de un interferómetro Michelson convencional, un contador de fotones de diseño propio y un foto-detector de referencia. Los resultados del trabajo confirman que dada su naturaleza de diseño y construcción, este instrumento de medición y su efectiva técnica de operación a bajo costo, constituye una alternativa viable, adaptable fácilmente a las necesidades de los actores productivos e institucionales, para asistirlos en la elaboración de bacanora y a la verificación de su calidad conforme a los criterios de la normatividad.
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.