Quantitative measurements of the CH radical in sooting diffusion flames at atmospheric pressure |
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Authors: | C Moreau E Therssen P Desgroux JF Pauwels A Chapput M Barj |
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Institution: | (1) Physicochimie des Processus de Combustion et de l’Atmosphère – UMR 8522, FR CNRS 2416 CERLA, Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq Cedex, France, FR;(2) Laboratoire de Spectrochimie Infrarouge et Raman – UMR 8516, FR CNRS 2416 CERLA, Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq Cedex, France, FR |
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Abstract: | The potential of Laser Induced Fluorescence detection of the CH radical using C–X (0–0) excitation is investigated in a sooting
methane/air diffusion flame at atmospheric pressure. Fluorescence is detected using the very narrow (<0.4 nm) Q-branch of
the C–X (0–0) band, which enables the measurement of CH in sooting flames without interference from PAH fluorescence and soot
emissions. Absolute concentrations are obtained using Cavity Ring Down Spectroscopy. 1D CH profiles in the sooting zone are
recorded using a CCD camera with an excellent signal-to-noise ratio. The C–X (0–0) excitation associated with Q-branch detection
is shown to be three times more efficient than the B–X scheme.
Received: 4 March 2002 / Revised version: 5 November 2002 / Published online: 5 May 2003
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ID="*"Corresponding author. Fax: +33-3/2033-6463, E-mail: eric.therssen@univ-lille1.fr |
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Keywords: | PACS: 33 50 -j |
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