Reference for citation: Popov E. E., Vitkin V. V. Influence of pressure on the results of measuring the volume fractions of gas components using Raman spectroscopy. Journal of Instrument Engineering. 2024. Vol. 67, N 2. P. 171—177 (in Russian). DOI: 10.17586/0021-3454-2024-67-2-171-177.

Abstract. The influence of pressure on the results of measuring the volume fractions of gas components using Raman spectroscopy is considered. The nonlinear nature of the influence of pressure on the light flux is revealed in the spectral range from 1380 to 1399 cm–1 for the isotopologue of carbon dioxide 12СО2 and in the spectral range from 1361 to 1379 cm–1 for the isotopologue of carbon dioxide 13СО2. The Raman spectra of gas mixtures of known isotopic composition are measured at different pressures. The function of deviation of the integral light flux from the linear dependence and its coefficients are found using the nonlinear least squares method. It is proposed to use this function to calculate correction factors in calibration functions. Calibration functions relate the light flux recorded by the radiation receiver to the volume fraction of molecules of the substance under study. The use of correction factors enables to increase the accuracy of measuring the volume fraction of the gas components under study.

Keywords: Raman scattering, influence of pressure on the Raman spectrum, volume fraction measurement, carbon dioxide

Acknowledgement: This work was supported by a grant from the Ministry of Science and Higher Education No. 075-15-2021-1349.

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