Diode laser atomic fluorescence temperature measurements in low-pressure flames

I.S. Burns, N. Lamoureux, C.F. Kaminski, J. Hult, P. Desgroux

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Temperature measurements have been performed in a low-pressure flame by the technique of diode laser induced atomic fluorescence. The experiments were done in a near-stoichiometric flat-flame of premixed methane, oxygen and nitrogen, at a pressure of 5.3 kPa. Indium atoms were seeded to the flame and probed using blue diode lasers; the lineshapes of the resulting fluorescence spectra were used to determine the flame temperature at a range of heights above the burner plate. The particular issues associated with the implementation of this measurement approach at low pressure are discussed, and it is shown to work especially well under these conditions. The atomic fluorescence lineshape thermometry technique is quicker to perform and requires less elaborate equipment than other methods that have previously been implemented in low-pressure flames, including OH-LIF and NO-LIF. There was sufficient indium present to perform measurements at all locations in the flame, including in the pre-heat zone close to the burner plate. Two sets of temperature measurements have been independently performed by using two different diode lasers to probe two separate transitions in atomic indium. The good agreement between the two sets of data provides a validation of the technique. By comparing thermocouple profiles recorded with and without seeding of the flame, we demonstrate that any influence of seeding on the flame temperature is negligible. The overall uncertainty of the measurements reported here is estimated to be +/- 2.5% in the burnt gas region.
LanguageEnglish
Pages907-914
Number of pages8
JournalApplied Physics B: Lasers and Optics
Volume93
Issue number4
DOIs
Publication statusPublished - 31 Oct 2008

Fingerprint

temperature measurement
flames
low pressure
semiconductor lasers
fluorescence
indium
flame temperature
burners
inoculation
laser induced fluorescence
thermocouples
methane
nitrogen
heat
probes
oxygen
profiles
gases
atoms

Keywords

  • diode laser
  • atomic fluorescence
  • temperature
  • measurements
  • low-pressure flames

Cite this

Burns, I.S. ; Lamoureux, N. ; Kaminski, C.F. ; Hult, J. ; Desgroux, P. / Diode laser atomic fluorescence temperature measurements in low-pressure flames. In: Applied Physics B: Lasers and Optics. 2008 ; Vol. 93, No. 4. pp. 907-914.
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Diode laser atomic fluorescence temperature measurements in low-pressure flames. / Burns, I.S.; Lamoureux, N.; Kaminski, C.F.; Hult, J.; Desgroux, P.

In: Applied Physics B: Lasers and Optics, Vol. 93, No. 4, 31.10.2008, p. 907-914.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Burns, I.S.

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AU - Kaminski, C.F.

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AB - Temperature measurements have been performed in a low-pressure flame by the technique of diode laser induced atomic fluorescence. The experiments were done in a near-stoichiometric flat-flame of premixed methane, oxygen and nitrogen, at a pressure of 5.3 kPa. Indium atoms were seeded to the flame and probed using blue diode lasers; the lineshapes of the resulting fluorescence spectra were used to determine the flame temperature at a range of heights above the burner plate. The particular issues associated with the implementation of this measurement approach at low pressure are discussed, and it is shown to work especially well under these conditions. The atomic fluorescence lineshape thermometry technique is quicker to perform and requires less elaborate equipment than other methods that have previously been implemented in low-pressure flames, including OH-LIF and NO-LIF. There was sufficient indium present to perform measurements at all locations in the flame, including in the pre-heat zone close to the burner plate. Two sets of temperature measurements have been independently performed by using two different diode lasers to probe two separate transitions in atomic indium. The good agreement between the two sets of data provides a validation of the technique. By comparing thermocouple profiles recorded with and without seeding of the flame, we demonstrate that any influence of seeding on the flame temperature is negligible. The overall uncertainty of the measurements reported here is estimated to be +/- 2.5% in the burnt gas region.

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