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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 orcid 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)
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author
; ; and
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
2016-04-01 11:38:48
date last changed
2025-10-14 12:12:41
@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}},
  keywords     = {{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}},
  doi          = {{10.1016/j.proci.2004.08.124}},
  volume       = {{30}},
  year         = {{2005}},
}