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In situ determination of N-2 broadening coefficients in flames for rotational CARS thermometry

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Author

Summary, in English

Total N-2 S-branch broadening coefficients have been measured in situ as a function of radial position in a highly sooting ethylene diffusion flame by the use of time-resolved dual-broadband picosecond pure rotational CARS (RCARS). Time-domain measurements of the J-dependent N-2 rotational coherence decays in the flame were used to determine the broadening coefficients, and these coefficients were then used in the spectral fitting routine for the determination of temperature and [O-2]/[N-2] ratio in the flame. Corrections of up to 125 K are found when compared to spectral fitting using an ECS self-broadened N-2 linewidth model. The presented technique effectively takes into account contributions to the N-2 linewidths from all collision partners without any a priori knowledge of relative species concentrations. Published by Elsevier Inc. on behalf of The Combustion Institute.

Department/s

Publishing year

2013

Language

English

Pages

3637-3644

Publication/Series

Proceedings of the Combustion Institute

Volume

34

Document type

Journal article

Publisher

Elsevier

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • Time-resolved spectroscopy
  • Raman linewidths
  • CARS
  • Ultrafast
  • Soot

Status

Published

ISBN/ISSN/Other

  • ISSN: 1540-7489