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Polarization spectroscopy applied to the detection of trace constituents in sooting combustion

Walewski, Joachim LU ; Nyholm, K; Dreizler, A and Aldén, Marcus LU (2004) In Applied Spectroscopy 58(2). p.238-242
Abstract
The potential of polarization spectroscopy for the detection of trace constituents in sooting combustion was investigated. It was demonstrated that the directionality of the polarization spectroscopy signal can be exploited to efficiently suppress incoherent interferences, e.g., Rayleigh scattering at soot particles. We also show how polarization spectroscopy compares with laser-induced fluorescence in this type of environment by applying both techniques to atmospheric-pressure, premixed propane/oxygen flames. The acquired signals were spatially resolved along the centerline of the flame, and measurements were conducted at several heights above the burner head and for medium to very high fuel-to-oxidizer ratios. Through our work we found... (More)
The potential of polarization spectroscopy for the detection of trace constituents in sooting combustion was investigated. It was demonstrated that the directionality of the polarization spectroscopy signal can be exploited to efficiently suppress incoherent interferences, e.g., Rayleigh scattering at soot particles. We also show how polarization spectroscopy compares with laser-induced fluorescence in this type of environment by applying both techniques to atmospheric-pressure, premixed propane/oxygen flames. The acquired signals were spatially resolved along the centerline of the flame, and measurements were conducted at several heights above the burner head and for medium to very high fuel-to-oxidizer ratios. Through our work we found that polarization spectroscopy can be applied even in the presence of large soot fractions. For most conditions, where laser-induced fluorescence suffered from interferences like elastic scattering, spatially filtered polarization spectroscopy signals were virtually background-free, and only for high soot loads did a noticeable background on the latter signal appear. This background likely stems from Mie scattering at very large soot particles. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
fluorescence, laser-induced, combustion diagnostics, polarization spectroscopy, soot
in
Applied Spectroscopy
volume
58
issue
2
pages
238 - 242
publisher
Society for Applied Spectroscopy
external identifiers
  • wos:000188974900014
  • scopus:1342329389
ISSN
1943-3530
DOI
10.1366/000370204322842995
language
English
LU publication?
yes
id
ca87cd82-2227-4325-aa05-1d4d21a27d42 (old id 287436)
date added to LUP
2007-11-05 07:53:49
date last changed
2017-01-01 04:37:04
@article{ca87cd82-2227-4325-aa05-1d4d21a27d42,
  abstract     = {The potential of polarization spectroscopy for the detection of trace constituents in sooting combustion was investigated. It was demonstrated that the directionality of the polarization spectroscopy signal can be exploited to efficiently suppress incoherent interferences, e.g., Rayleigh scattering at soot particles. We also show how polarization spectroscopy compares with laser-induced fluorescence in this type of environment by applying both techniques to atmospheric-pressure, premixed propane/oxygen flames. The acquired signals were spatially resolved along the centerline of the flame, and measurements were conducted at several heights above the burner head and for medium to very high fuel-to-oxidizer ratios. Through our work we found that polarization spectroscopy can be applied even in the presence of large soot fractions. For most conditions, where laser-induced fluorescence suffered from interferences like elastic scattering, spatially filtered polarization spectroscopy signals were virtually background-free, and only for high soot loads did a noticeable background on the latter signal appear. This background likely stems from Mie scattering at very large soot particles.},
  author       = {Walewski, Joachim and Nyholm, K and Dreizler, A and Aldén, Marcus},
  issn         = {1943-3530},
  keyword      = {fluorescence,laser-induced,combustion diagnostics,polarization spectroscopy,soot},
  language     = {eng},
  number       = {2},
  pages        = {238--242},
  publisher    = {Society for Applied Spectroscopy},
  series       = {Applied Spectroscopy},
  title        = {Polarization spectroscopy applied to the detection of trace constituents in sooting combustion},
  url          = {http://dx.doi.org/10.1366/000370204322842995},
  volume       = {58},
  year         = {2004},
}