Picosecond time-resolved pure-rotational coherent anti-Stokes Raman spectroscopy in sooting flames

Christopher J. Kliewer, Yi Gao, Thomas Seeger, Johannes Kiefer, Brian D. Patterson, Thomas B. Settersten

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

The development of time-resolved dual-broadband pure-rotational coherent anti-Stokes Raman spectroscopy using picosecond laser pulses is investigated for use in the study of highly sooting flames. Axi-symmetric ethylene and propane diffusion flames were studied. Suppression of nonresonant and Raman resonant interference signals is demonstrated by delaying the probe pulse beyond the temporal envelope of the pump pulses, and these spectra are compared with those obtained using conventional polarization-based interference suppression techniques. Flame profiles for both temperature and the O-2 to N-2 ratio are obtained. Evaluated temperatures are corrected for delay-induced spectral heating and compared to published thermocouple measurements. Published by Elsevier Inc. on behalf of The Combustion Institute.
Original languageEnglish
Pages (from-to)831-838
Number of pages8
JournalProceedings of the Combustion Institute
Volume33
Issue number1
Early online date20 Sep 2010
DOIs
Publication statusPublished - 2011

Keywords

  • time-resolved CARS
  • thermometry
  • soot
  • combustion

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