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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 27 — Sep. 20, 2001
  • pp: 4894–4903

Diode-laser wavelength-modulation absorption spectroscopy for quantitative in situ measurements of temperature and OH radical concentration in combustion gases

Tetsuya Aizawa  »View Author Affiliations


Applied Optics, Vol. 40, Issue 27, pp. 4894-4903 (2001)
http://dx.doi.org/10.1364/AO.40.004894


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Abstract

The in situ quantitative profiles of temperature and OH radical concentration in a postflame region of methane–air premixed counterflow flames were measured by wavelength modulation spectroscopy with a 1.5-µm external cavity diode laser. The second harmonic (2f) signal was generated from absorption by overtone vibrational–rotational transitions of OH: the Π3/2 (v′, v″) = (2, 0) P11.5e (ν0 = 6421.35 cm-1) or the Π3/2 (v′, v″) = (3, 1) P5.5f (ν0 = 6434.61 cm-1) transitions. The absorption occurred in the postflame region between methane–air premixed twin flames stabilized in a two-dimensional laminar counterflow burner (Tsuji burner) with a 60-mm line-of-sight path length. The temperature and OH concentration profiles at an equivalence ratio of ϕ = 0.85 were determined by least-squares fitting of theoretical 2f line shapes to the experimental counterparts and by calculation of the ratio of the line intensities of the two different OH transitions (two-line thermometry). The measured temperature and OH concentration profiles were cross checked by Rayleigh scattering thermometry, thermocouple measurements, and two-dimensional numerical prediction of premixed combustion by use of a detailed chemical kinetic mechanism. The measurements and the prediction showed reasonable agreement.

© 2001 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(300.1030) Spectroscopy : Absorption
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6380) Spectroscopy : Spectroscopy, modulation

History
Original Manuscript: September 12, 2000
Revised Manuscript: April 2, 2001
Published: September 20, 2001

Citation
Tetsuya Aizawa, "Diode-laser wavelength-modulation absorption spectroscopy for quantitative in situ measurements of temperature and OH radical concentration in combustion gases," Appl. Opt. 40, 4894-4903 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-27-4894


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