Interference free spontaneous Raman spectroscopy for measurements in rich hydrocarbon flames

Gaetano Magnotti*, D. Geyer, R. S. Barlow

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The capability to simultaneously acquire two orthogonal components of a Raman spectrum has been added to the Sandia Raman/Rayleigh/CO-LIF instrument for combustion measurements. This addition allows removing unpolarized fluorescence interference signal from Raman spectra, extending the applicability of the instrument to rich hydrocarbon flames. The optical set-up and the data analysis approach are described. The instrument is tested in challenging rich laminar and turbulent CH4/air flames, deemed inaccessible with the previous instrument. Experimental results show good agreement with laminar calculations performed with Chemkin. The approach also avoids the cumbersome calibration and correction procedures required for data collected with the previous version of the instrument in presence of mild fluorescence interference. The drawback is a drop in the instrument precision, in particular for CO2 and O2 concentrations.

Original languageEnglish (US)
Pages (from-to)3765-3772
Number of pages8
JournalProceedings of the Combustion Institute
Volume35
Issue number3
DOIs
StatePublished - Jan 1 2015

Keywords

  • 1D Raman spectroscopy
  • Diagnostics
  • Interference
  • Turbulent flames

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

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