High-pressure measuring cell for Raman spectroscopic studies of natural gas

Susanne Brunsgaard Hansen, Rolf W. Berg, Erling Halfdan Stenby

Research output: Contribution to journalJournal articleResearchpeer-review


A system for obtaining Raman spectra of gases at high pressure has been constructed. In order to ensure that a natural gas sample is totally representative, a high-pressure gas-measuring cell has been developed, built up by stainless steel fittings and a sapphire tube. The design and construction of this cell are described. A perfect pressure seal has been demonstrated up to 15.0 MPaA (MPa absolute). The cell has been successfully used to obtain Raman spectra of natural gas samples. Some of these spectra are presented and assigned. The most remarkable observation in the spectra is that it is possible to detect hydrogen sulfide at concentrations of 1-3 mg H2S/Nm(3). An attempt to make a quantitative analysis of natural gas by the so-called "ratio method" is presented. In addition to this, the relative normalized differential Raman scattering cross sections for ethane and i-butane molecules at 8.0 MPaA and 10.2 MPaA have been determined.
Original languageEnglish
JournalApplied Spectroscopy
Issue number1
Pages (from-to)55-60
Publication statusPublished - 2001


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