Polarization Spectroscopy Applied to the Detection of Trace Constituents in Sooting Combustion

J. W. Walewski, K. Nyholm, A. Dreizler, M. Aldén

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)238-242
Number of pages5
JournalApplied Spectroscopy
Volume58
Issue number2
DOIs
Publication statusPublished - 1 Feb 2004
MoE publication typeA1 Journal article-refereed

Fingerprint

Soot
soot
Spectroscopy
Polarization
polarization
spectroscopy
laser induced fluorescence
flames
Fluorescence
interference
Propane
Rayleigh scattering
Elastic scattering
oxidizers
Lasers
Mie scattering
burners
Fuel burners
stems
propane

Keywords

  • Combustion diagnostics
  • Laser-induced fluorescence
  • Polarization spectroscopy
  • Soot

Cite this

Walewski, J. W. ; Nyholm, K. ; Dreizler, A. ; Aldén, M. / Polarization Spectroscopy Applied to the Detection of Trace Constituents in Sooting Combustion. In: Applied Spectroscopy. 2004 ; Vol. 58, No. 2. pp. 238-242.
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Polarization Spectroscopy Applied to the Detection of Trace Constituents in Sooting Combustion. / Walewski, J. W.; Nyholm, K.; Dreizler, A.; Aldén, M.

In: Applied Spectroscopy, Vol. 58, No. 2, 01.02.2004, p. 238-242.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Dreizler, A.

AU - Aldén, M.

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N2 - 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.

AB - 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.

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