title: High pressure and temperature optical flow cell for near-infra-red spectroscopic analysis of gas mixtures.
abstract: A new optical flow cell with a new optical arrangement adapted for high pressures and temperatures using glass fibres to connect light source, cell, and spectrometer has been developed, as part of a larger project comprising new methods for in situ analysis of bio and hydrogen gas mixtures in high pressure and temperature applications. The analysis is based on measurements of optical, thermo-physical, and electromagnetic properties in gas mixtures with newly developed high pressure property sensors, which are mounted in a new apparatus which can generate gas mixtures with up to six components with an uncertainty of composition of as little as 0.1 mol. %. Measurements of several pure components of natural gases and biogases to a pressure of 20 MPa were performed on two isotherms, and with binary mixtures of the same pure gases at pressures to 17.5 MPa. Thereby a new method of analyzing the obtained spectra based on the partial density of methane was investigated.
authors.affiliation: Experimental Thermodynamics, Ruhr-University Bochum, Bochum 44780, Germany.
authors.forename: C G
authors.initials: CG
authors.lastname: Norton
authors.affiliation: Experimental Thermodynamics, Ruhr-University Bochum, Bochum 44780, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Suedmeyer
authors.affiliation: Avantes BV, Oude Apeldoornseweg 28, Apeldoorn 7333, Netherlands.
authors.forename: B
authors.initials: B
authors.lastname: Oderkerk
authors.affiliation: Experimental Thermodynamics, Ruhr-University Bochum, Bochum 44780, Germany.
authors.forename: T M
authors.initials: TM
authors.lastname: Fieback
mesh_terms: D056804:Biofuels / Q000032:analysis*; D006859:Hydrogen / Q000032:analysis*; D008697:Methane / Q000032:analysis*; D011312:Pressure; D013055:Spectrophotometry, Infrared / Q000295:instrumentation / Q000379:methods
chemical_list: D056804:Biofuels; D006859:Hydrogen; D008697:Methane