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Mid-infrared polarization spectroscopy of C2H2: Non-intrusive spatial-resolved measurements of polyatomic hydrocarbon molecules for combustion diagnostics

Li, Zhongshan LU ; Linvin, Martin LU ; Zetterberg, Johan LU ; Kiefer, J. and Aldén, Marcus LU (2007) 31st International Symposium on Combustion In Proceedings of the Combustion Institute 31 I. p.817-824
Abstract
Polarization spectroscopy in the mid-infrared (IRPS) has been applied to the detection of acetylene molecules making use of the asymmetric C-H stretching vibration at around 3 μm. The infrared laser pulses were produced through difference frequency generation in a LiNbO<sub>3</sub> crystal pumped by a Nd:YAG and dye laser system. By directly probing the ro-vibrational transitions with IRPS, sensitive detection of molecules with otherwise inaccessible electronic states was realized with high temporal and spatial resolution by using a pulsed laser and a cross-beam geometry. Detection sensitivities of 2 × 10<sup>13</sup> molecules/cm<sup>3</sup> (10 ppm in 70 mbar gas mixture) of... (More)
Polarization spectroscopy in the mid-infrared (IRPS) has been applied to the detection of acetylene molecules making use of the asymmetric C-H stretching vibration at around 3 μm. The infrared laser pulses were produced through difference frequency generation in a LiNbO<sub>3</sub> crystal pumped by a Nd:YAG and dye laser system. By directly probing the ro-vibrational transitions with IRPS, sensitive detection of molecules with otherwise inaccessible electronic states was realized with high temporal and spatial resolution by using a pulsed laser and a cross-beam geometry. Detection sensitivities of 2 × 10<sup>13</sup> molecules/cm<sup>3</sup> (10 ppm in 70 mbar gas mixture) of C<sub>2</sub>H<sub>2</sub> were achieved using the P(11) line of the (010(11)<sup>0</sup>)-(0000<sup>0</sup>0<sup>0</sup>) band. The dependence of the IRPS signal on the pump laser fluence, acetylene mole fraction, and buffer gas pressure of Ar, N<sub>2</sub>, H<sub>2</sub>, and CO<sub>2</sub> has been studied experimentally. The investigation demonstrates the quantitative nature of IRPS for sensitive detection of polyatomic IR active molecules. In order to fully demonstrate the technique for combustion applications, nascent acetylene molecules were measured in a low pressure methane/oxygen flame. © 2006 The Combustion Institute. Published by Elsevier Inc. All rights reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Hydrocarbon detection, Combustion intermediates, Soot formation precursor, Combustion diagnostics, Polarization spectroscopy in the mid-infrared
in
Proceedings of the Combustion Institute
volume
31 I
pages
817 - 824
publisher
Elsevier
conference name
31st International Symposium on Combustion
external identifiers
  • wos:000252858000082
  • other:CODEN: SYMCAQ
  • scopus:34247255674
ISSN
1540-7489
1873-2704
DOI
10.1016/j.proci.2006.08.054
language
English
LU publication?
yes
id
e6ed91d5-534a-4c1c-bf70-09027361c405 (old id 643235)
date added to LUP
2007-12-04 15:45:41
date last changed
2017-11-19 03:27:34
@inproceedings{e6ed91d5-534a-4c1c-bf70-09027361c405,
  abstract     = {Polarization spectroscopy in the mid-infrared (IRPS) has been applied to the detection of acetylene molecules making use of the asymmetric C-H stretching vibration at around 3 μm. The infrared laser pulses were produced through difference frequency generation in a LiNbO&lt;sub&gt;3&lt;/sub&gt; crystal pumped by a Nd:YAG and dye laser system. By directly probing the ro-vibrational transitions with IRPS, sensitive detection of molecules with otherwise inaccessible electronic states was realized with high temporal and spatial resolution by using a pulsed laser and a cross-beam geometry. Detection sensitivities of 2 × 10&lt;sup&gt;13&lt;/sup&gt; molecules/cm&lt;sup&gt;3&lt;/sup&gt; (10 ppm in 70 mbar gas mixture) of C&lt;sub&gt;2&lt;/sub&gt;H&lt;sub&gt;2&lt;/sub&gt; were achieved using the P(11) line of the (010(11)&lt;sup&gt;0&lt;/sup&gt;)-(0000&lt;sup&gt;0&lt;/sup&gt;0&lt;sup&gt;0&lt;/sup&gt;) band. The dependence of the IRPS signal on the pump laser fluence, acetylene mole fraction, and buffer gas pressure of Ar, N&lt;sub&gt;2&lt;/sub&gt;, H&lt;sub&gt;2&lt;/sub&gt;, and CO&lt;sub&gt;2&lt;/sub&gt; has been studied experimentally. The investigation demonstrates the quantitative nature of IRPS for sensitive detection of polyatomic IR active molecules. In order to fully demonstrate the technique for combustion applications, nascent acetylene molecules were measured in a low pressure methane/oxygen flame. © 2006 The Combustion Institute. Published by Elsevier Inc. All rights reserved.},
  author       = {Li, Zhongshan and Linvin, Martin and Zetterberg, Johan and Kiefer, J. and Aldén, Marcus},
  booktitle    = {Proceedings of the Combustion Institute},
  issn         = {1540-7489},
  keyword      = {Hydrocarbon detection,Combustion intermediates,Soot formation precursor,Combustion diagnostics,Polarization spectroscopy in the mid-infrared},
  language     = {eng},
  pages        = {817--824},
  publisher    = {Elsevier},
  title        = {Mid-infrared polarization spectroscopy of C<sub>2</sub>H<sub>2</sub>: Non-intrusive spatial-resolved measurements of polyatomic hydrocarbon molecules for combustion diagnostics},
  url          = {http://dx.doi.org/10.1016/j.proci.2006.08.054},
  volume       = {31 I},
  year         = {2007},
}