Two-line atomic fluorescence flame thermometry using diode lasers

J. Hult, I.S. Burns, C.F. Kaminski

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

This paper reports on the first application of diode laser based LIF for pointwise temperature measurements in flames. The technique is based on two-line atomic fluorescence (TLAF) thermometry of indium atoms seeded at trace levels into the flame. Two novel extended cavity diode laser systems (ECDLs) were developed, providing tunable single-mode radiation around 410 and 451 nm, respectively, to excite the temperature sensitive 5P(1/2)-6S(1/2) and 5P(3/2)-6S(1/2) transitions of indium. The wide tuning range of the ECDLs allowed scans over the entire pressure broadened hyperfine structure of both transitions to be performed with signal-to-noise ratios exceeding 50 on single wavelength sweeps (at 20 Hz). We present a modified TLAF detection scheme that requires only a single detector and obviates the need for detection system calibration. Spatially resolved temperature profiles were obtained from a laminar premixed CH4/air flame and found to be in excellent agreement with temperatures obtained from high-resolution OH LIF scans. The accuracy and spatial resolution of the technique makes this an attractive alternative to traditional, more complex, and expensive, temperature measurement techniques of similar or better precision. Finally, we demonstrate that PLIF imaging of atom distributions in flames is possible using low power diode lasers.
LanguageEnglish
Pages1535-1543
Number of pages9
JournalProceedings of the Combustion Institute
Volume30
Issue number1
DOIs
Publication statusPublished - Jan 2005

Fingerprint

temperature measurement
Semiconductor lasers
flames
Fluorescence
semiconductor lasers
fluorescence
Indium
Temperature measurement
laser induced fluorescence
indium
Atoms
cavities
hyperfine structure
temperature profiles
Temperature
atoms
Signal to noise ratio
signal to noise ratios
Tuning
spatial resolution

Keywords

  • diode laser
  • LIF
  • thermometry
  • atomic fluorescence
  • pressure broadening
  • premixed flame

Cite this

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title = "Two-line atomic fluorescence flame thermometry using diode lasers",
abstract = "This paper reports on the first application of diode laser based LIF for pointwise temperature measurements in flames. The technique is based on two-line atomic fluorescence (TLAF) thermometry of indium atoms seeded at trace levels into the flame. Two novel extended cavity diode laser systems (ECDLs) were developed, providing tunable single-mode radiation around 410 and 451 nm, respectively, to excite the temperature sensitive 5P(1/2)-6S(1/2) and 5P(3/2)-6S(1/2) transitions of indium. The wide tuning range of the ECDLs allowed scans over the entire pressure broadened hyperfine structure of both transitions to be performed with signal-to-noise ratios exceeding 50 on single wavelength sweeps (at 20 Hz). We present a modified TLAF detection scheme that requires only a single detector and obviates the need for detection system calibration. Spatially resolved temperature profiles were obtained from a laminar premixed CH4/air flame and found to be in excellent agreement with temperatures obtained from high-resolution OH LIF scans. The accuracy and spatial resolution of the technique makes this an attractive alternative to traditional, more complex, and expensive, temperature measurement techniques of similar or better precision. Finally, we demonstrate that PLIF imaging of atom distributions in flames is possible using low power diode lasers.",
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Two-line atomic fluorescence flame thermometry using diode lasers. / Hult, J.; Burns, I.S.; Kaminski, C.F.

In: Proceedings of the Combustion Institute, Vol. 30, No. 1, 01.2005, p. 1535-1543.

Research output: Contribution to journalArticle

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