Analysis and Classification of Liquid Samples Using Spatial Heterodyne Raman Spectroscopy
Spatial heterodyne spectroscopy (SHS) is used for quantitative analysis and classification of liquid samples. SHS is a versionof a Michelson interferometer with no moving parts and with diffraction gratings in place of mirrors. The instrumentconverts frequency-resolved information into a spatia...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
2019
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| Sorozat: | APPLIED SPECTROSCOPY
73 No. 12 |
| doi: | 10.1177/0003702819863847 |
| mtmt: | 30843756 |
| Online Access: | http://publicatio.bibl.u-szeged.hu/18529 |
| Tartalmi kivonat: | Spatial heterodyne spectroscopy (SHS) is used for quantitative analysis and classification of liquid samples. SHS is a versionof a Michelson interferometer with no moving parts and with diffraction gratings in place of mirrors. The instrumentconverts frequency-resolved information into a spatially resolved one and records it in the form of interferograms.The back-extraction of spectral information is done by the fast Fourier transform. A SHS instrument is constructedwith the resolving power 5000 and spectral range 522–593 nm. Two original technical solutions are used as compared toprevious SHS instruments: the use of a high-frequency diode-pumped solid-state laser for excitation of Raman spectra anda microscope-based collection system. Raman spectra are excited at 532 nm at the repetition rate 80 kHz. Raman shiftsbetween 330 cm-1 and 1600 cm-1 are measured. A new application of SHS is demonstrated: for the first time, it is used forquantitative Raman analysis to determine concentrations of cyclohexane in isopropanol and glycerol in water. Two cali-bration strategies are employed: univariate based on the construction of a calibration plot and multivariate based on partialleast squares regression. The detection limits for both cyclohexane in isopropanol and glycerol in water are at a 0.5 mass%level. In addition to the Raman–SHS chemical analysis, classification of industrial oils (biodiesel, poly(1-decene), gasoline,heavy oil IFO380, polybutenes, and lubricant) is performed using the Raman–fluorescence spectra of the oils and principalcomponent analysis. The oils are easily discriminated showing distinct non-overlapping patterns in the principal componentspace. |
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| Terjedelem/Fizikai jellemzők: | 1409-1419 |
| ISSN: | 0003-7028 |