Analyzing natural gas by spontaneous Raman scattering spectroscopy

Abstract

The use of multipass optical systems as well as the compression of the gaseous test medium to increase the signal intensity of the spontaneous Raman scattering of light has been experimentally studied. A description of a prototype developed for a natural-gas analyzer based on spontaneous Raman scattering spectroscopy is presented. A technique is described for calculating the composition of natural gas from its spectrum. The results are compared with chromatographic-analysis data.

Application of Raman spectroscopy analysis in unconventional natural gas reservoirs – density and pressure dependence on Raman signal intensity

“…Pressure growth causes also a shift of a characteristic band of a given vibration. Performing a similar analysis for a set of samples with different molar fractions allows one to create a intelligent algorithm which enable characterization of reservoir fluid through Raman spectra comparison [17,20,26,[29][30][31][32][33]. This knowledge is fundamental for further reservoir fluid analysis.…”

Recent Advances in the Characterization of Gaseous and Liquid Fuels by Vibrational Spectroscopy

“…Excellent agreement with reference gas chromatography measurements was found. In recent years, Buldakov et al [60,61] developed a Raman analyzer for natural gas characterization as well. They obtained similar sensitivity (~0.01%) using a multi-pass arrangement and a 2-W laser (532 nm).…”

Analysis of Natural Gas Using a Portable Hollow-Core Photonic Crystal Coupled Raman Spectrometer

“…This disadvantage explains the choice of laser power at tens of watts and scattering signal collection times at tens of minutes to achieve a satisfactory signal for the quantitative characterization of natural gas. 7,8 Such powerful laser systems with long acquisition time are inadequate in the field conditions. In recent years, new methodological approaches have been developed and tested to mitigate these limitations.…”