Helium Detection in Natural Gas Using Raman Spectroscopy.

Raman spectroscopy has great potential for quantitative analysis of natural gas. Helium is one of the components of natural gas and has a wide range of applications. It was believed that noble gases could not be detected using this technique due to the absence of their vibrational spectra.

CH/CH sensing using Raman spectroscopy.

The paper presents a technique for measuring the concentration of CH in natural methane using Raman spectroscopy. The peak positions and the relative scattering cross-sections of the Q-branches for the most intense vibrational bands of CH are determined. Features of the CH/CH ratio measurement methods using Q-branches of the ν and ν bands were considered.

Broadening of the ν Raman Band of CH by CH and CH.

Raman spectroscopy is a promising method for the analysis of natural gas. It is necessary to account for the broadening effects on spectral lines to improve measurement accuracy. In this study, the broadening coefficients for methane lines in the region of the ν band perturbed by propane, n-butane, and isobutane at room temperature were measured.

Pressure broadening in Raman spectra of CH-N, CH-CO, and CH-CH gas mixtures.

Different molecular environments change the spectrum of a given gas sample involved in a mixture compared to the spectrum of a pure gas. It is necessary to account for this effect to improve the accuracy of the analysis of the natural gas composition by Raman spectroscopy. First, the change in the main components of natural gas (methane, nitrogen, carbon dioxide, and ethane) must be considered.

Raman Natural Gas Analyzer: Effects of Composition on Measurement Precision.

Raman spectroscopy is a promising method for analyzing natural gas due to its high measurement speed and the potential to monitor all molecular components simultaneously. This paper discusses the features of measurements of samples whose composition varies over a wide range (0.005-100%).

Depolarization Ratio of the ν Raman Band of Pure CH and Perturbed by N and CO.

In this work, the effect of nitrogen and carbon dioxide on the depolarization ratio of the ν band of methane in the pressure range of 0.1-5 MPa is studied. A high-sensitivity single-pass Raman spectrometer was used to obtain accurate results.