Advanced

Mid-infrared PS and LIF detection of CH4 and C2H 6 in cold flows and flames at atmospheric pressure

Li, Zhongshan LU ; Rupinski, M; Zetterberg, Johan LU and Aldén, Marcus LU (2005) In Proceedings of the Combustion Institute 30(1). p.1629-1636
Abstract
Mid-infrared polarization spectroscopy (IRPS) and laser-induced fluorescence (IRLIF) have been applied for detection of methane and ethane in atmospheric pressure cold flows and flames. Lines belonging to the asymmetric C-H stretching vibration bands v<sub>3</sub> and v<sub>7</sub> for methane and ethane, respectively, were probed with a tunable infrared laser beam at about 3.4 μm, which was obtained from difference frequency generation in a LiNbO<sub>3</sub> crystal pumped by a dye-laser beam and a Nd:YAG fundamental laser beam. The dependence of IRPS and IRLIF signal of CH<sub>4</sub> on different buffer gases, including He, Ar, N<sub>2</sub>, and CO<sub>2</sub> was... (More)
Mid-infrared polarization spectroscopy (IRPS) and laser-induced fluorescence (IRLIF) have been applied for detection of methane and ethane in atmospheric pressure cold flows and flames. Lines belonging to the asymmetric C-H stretching vibration bands v<sub>3</sub> and v<sub>7</sub> for methane and ethane, respectively, were probed with a tunable infrared laser beam at about 3.4 μm, which was obtained from difference frequency generation in a LiNbO<sub>3</sub> crystal pumped by a dye-laser beam and a Nd:YAG fundamental laser beam. The dependence of IRPS and IRLIF signal of CH<sub>4</sub> on different buffer gases, including He, Ar, N<sub>2</sub>, and CO<sub>2</sub> was investigated. Simultaneous measurements of IRPS and IRLIF signals allowed a direct comparison of the two techniques, and IRPS was found to be superior in detection sensitivity and background discrimination. IRPS excitation scans of a methane and ethane mixture diluted in Ar were also performed in a jet at ambient pressure and temperature. Lines in the spectrum belonging to methane and ethane were fully recognized and assigned. From the ethane lines in the IRPS excitation spectrum, a detection limit of 50 ppm was conservatively estimated, and this indicates that IRPS is a promising sensitive technique for hydrocarbon identification and detection. Finally, CH<sub>4</sub> IRPS detection in a CH<sub>4</sub>/H<sub>2</sub>/air premixed flat flame was demonstrated, with spatially resolved IRPS CH<sub>4</sub> measurements along different heights in the flame. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Infrared polarization spectroscopy (IRPS), Laser-induced fluorescence, Excitation spectrum, Laser combustion diagnostics
in
Proceedings of the Combustion Institute
volume
30
issue
1
pages
1629 - 1636
publisher
Elsevier
external identifiers
  • wos:000229944200177
  • scopus:84964228129
ISSN
1540-7489
DOI
10.1016/j.proci.2004.08.124
language
English
LU publication?
yes
id
27cf3b62-2be1-40b2-b2e5-aca4c3faa235 (old id 616252)
date added to LUP
2007-12-21 15:14:41
date last changed
2017-01-01 04:24:12
@article{27cf3b62-2be1-40b2-b2e5-aca4c3faa235,
  abstract     = {Mid-infrared polarization spectroscopy (IRPS) and laser-induced fluorescence (IRLIF) have been applied for detection of methane and ethane in atmospheric pressure cold flows and flames. Lines belonging to the asymmetric C-H stretching vibration bands v&lt;sub&gt;3&lt;/sub&gt; and v&lt;sub&gt;7&lt;/sub&gt; for methane and ethane, respectively, were probed with a tunable infrared laser beam at about 3.4 μm, which was obtained from difference frequency generation in a LiNbO&lt;sub&gt;3&lt;/sub&gt; crystal pumped by a dye-laser beam and a Nd:YAG fundamental laser beam. The dependence of IRPS and IRLIF signal of CH&lt;sub&gt;4&lt;/sub&gt; on different buffer gases, including He, Ar, N&lt;sub&gt;2&lt;/sub&gt;, and CO&lt;sub&gt;2&lt;/sub&gt; was investigated. Simultaneous measurements of IRPS and IRLIF signals allowed a direct comparison of the two techniques, and IRPS was found to be superior in detection sensitivity and background discrimination. IRPS excitation scans of a methane and ethane mixture diluted in Ar were also performed in a jet at ambient pressure and temperature. Lines in the spectrum belonging to methane and ethane were fully recognized and assigned. From the ethane lines in the IRPS excitation spectrum, a detection limit of 50 ppm was conservatively estimated, and this indicates that IRPS is a promising sensitive technique for hydrocarbon identification and detection. Finally, CH&lt;sub&gt;4&lt;/sub&gt; IRPS detection in a CH&lt;sub&gt;4&lt;/sub&gt;/H&lt;sub&gt;2&lt;/sub&gt;/air premixed flat flame was demonstrated, with spatially resolved IRPS CH&lt;sub&gt;4&lt;/sub&gt; measurements along different heights in the flame.},
  author       = {Li, Zhongshan and Rupinski, M and Zetterberg, Johan and Aldén, Marcus},
  issn         = {1540-7489},
  keyword      = {Infrared polarization spectroscopy (IRPS),Laser-induced fluorescence,Excitation spectrum,Laser combustion diagnostics},
  language     = {eng},
  number       = {1},
  pages        = {1629--1636},
  publisher    = {Elsevier},
  series       = {Proceedings of the Combustion Institute},
  title        = {Mid-infrared PS and LIF detection of CH<sub>4</sub> and C<sub>2</sub>H <sub>6</sub> in cold flows and flames at atmospheric pressure},
  url          = {http://dx.doi.org/10.1016/j.proci.2004.08.124},
  volume       = {30},
  year         = {2005},
}