Laser-induced breakdown flame thermometry

Johannes Kiefer, Johannes W. Troeger, Zhongshan Li, Thomas Seeger, Marcus Alden, Alfred Leipertz

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Abstract

The determination of temperature distribution is an essential task when flames are characterized. We propose a new approach for flame thermometry based on laser-induced breakdown spectroscopy (LIBS) utilizing the temperature dependency of the breakdown threshold laser pulse energy. Calibration measurements are carried out in heated gas flows and post-combustion gases. Compositional effects on the breakdown threshold are corrected employing a straightforward procedure. For this purpose, the elemental composition is derived from the LIBS spectra and this information is then used for correcting the measured threshold laser pulse energy. A series of proof-of-concept measurements in a laminar methane/air flame on a Bunsen burner is conducted and compared to reference data from coherent anti-Stokes Raman scattering (CARS). The corrected LIBS temperatures show excellent agreement with those obtained by CARS. Therefore, our approach represents a simple and straightforward alternative to traditionally used thermometry methods. (C) 2012 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
Original languageEnglish
Pages (from-to)3576-3582
Number of pages7
JournalCombustion and Flame
Volume159
Issue number12
Early online date6 Sep 2012
DOIs
Publication statusPublished - 1 Dec 2012

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Keywords

  • laser-induced breakdown spectroscopy
  • temperature
  • composition
  • plasma
  • laminar flames

Cite this

Kiefer, J., Troeger, J. W., Li, Z., Seeger, T., Alden, M., & Leipertz, A. (2012). Laser-induced breakdown flame thermometry. Combustion and Flame, 159(12), 3576-3582. https://doi.org/10.1016/j.combustflame.2012.08.005