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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 30 — Oct. 20, 2000
  • pp: 5579–5589

In situ combustion measurements of CO with diode-laser absorption near 2.3 µm

Jian Wang, Mikhail Maiorov, Douglas S. Baer, Dmitri Z. Garbuzov, John C. Connolly, and Ronald K. Hanson  »View Author Affiliations


Applied Optics, Vol. 39, Issue 30, pp. 5579-5589 (2000)
http://dx.doi.org/10.1364/AO.39.005579


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Abstract

In situ measurements of CO concentration were recorded with tunable diode-laser absorption spectroscopy techniques in both the exhaust and the immediate post-flame regions of an atmospheric-pressure flat-flame burner operating on ethylene air. Two room-temperature cw single-mode InGaAsSb/AlGaAsSb diode lasers operating near 2.3 µm were tuned over individual transitions in the CO first overtone band (v′ = 2 ← v″ = 0) to record high-resolution absorption line shapes in the exhaust duct [79 cm above the burner, ∼470 K; R(15) transition at 4311.96 cm-1] and the immediate postflame zone [1.5 cm above the burner, 1820–1975 K; R(30) transition at 4343.81 cm-1]. The CO concentration was determined from the measured absorption and the gas temperature, which was monitored with type-S thermocouples. For measurements in the exhaust duct, the noise-equivalent absorbance was ∼3 × 10-5 (50-kHz detection bandwidth, 50-sweep average, 0.1-s total measurement time), which corresponds to a CO detection limit of 1.5 ppm m at 470 K. Wavelength modulation spectroscopy techniques were used to improve the detection limit in the exhaust to ∼0.1 ppm m (∼500-Hz detection bandwidth, 20-sweep average, 0.4-s total measurement time). For measurements in the immediate postflame zone, the measured CO concentrations in the fuel-rich flames were in good agreement with chemical equilibrium predictions. These experiments demonstrate the utility of diode-laser absorption sensors operating near 2.3 µm for in situ combustion emission monitoring and combustion diagnostics.

© 2000 Optical Society of America

OCIS Codes
(280.1740) Remote sensing and sensors : Combustion diagnostics
(280.3420) Remote sensing and sensors : Laser sensors
(300.1030) Spectroscopy : Absorption
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6380) Spectroscopy : Spectroscopy, modulation

History
Original Manuscript: February 8, 2000
Revised Manuscript: June 5, 2000
Published: October 20, 2000

Citation
Jian Wang, Mikhail Maiorov, Douglas S. Baer, Dmitri Z. Garbuzov, John C. Connolly, and Ronald K. Hanson, "In situ combustion measurements of CO with diode-laser absorption near 2.3 µm," Appl. Opt. 39, 5579-5589 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-30-5579

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