Application of Raman spectroscopy to gas mixture composition analysis

For Russian citation (Opticheskii Zhurnal):

Шелаев А.В., Барышев А.В. Применение спектроскопии комбинационного рассеяния для анализа состава газовой смеси // Оптический журнал. 2026. Т. 93. № 5. С. 60–70. http://doi.org/10.17586/1023-5086-2026-93-05-60-70

Shelaev A.V., Baryshev A.V. Application of Raman spectroscopy to gas mixture composition analysis [in Russian] // Opticheskii Zhurnal. 2026. V. 93. № 5. P. 60–70. http://doi.org/10.17586/1023-5086-2026-93-05-60-70

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Optical configurations for excitation and detection of Raman scattering in gas mixture molecules. Aim of study. Development of single-pass detection optical scheme for gas analysis based on Raman spectroscopy. Method. In the focal region of a laser beam (wavelength 445 nm), inelastic (Raman) scattering occurs on gas molecules. The elastically scattered light is suppressed by edge filters, while the inelastically scattered light is detected by a confocal spectrometer. Main results. Collinear (“backscattering”) and “crossed-beam” optical configurations were compared; the latter provides a significantly better signal-to-noise ratio. The maximum Raman signal was achieved using a parabolic mirror with a 15 cm focal length. Detection limits at a 10 s integration time were: 60 ppm for H2, 240–270 ppm for N2, O2, CO2 and 0.45% relative humidity for H2O. A linear dependence of the indications on concentration was observed across the full range (0–100%). Practical significance. The results obtained in the study will serve as the basis for the development of prototypes of optical analyzers for gas mixture composition.

Keywords:

Raman spectroscopy, laser, gas

Acknowledgements:

the article was prepared with the financial support of the Ministry of Science and Higher Education of the Russian Federation (grant № 075-11-2025-057)

OCIS codes: 300.6450, 010.1280

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