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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 16 — Jun. 1, 2009
  • pp: 3075–3083

Acetylene measurement in flames by chirp-based quantum cascade laser spectrometry

Zachary R. Quine and Kevin L. McNesby  »View Author Affiliations


Applied Optics, Vol. 48, Issue 16, pp. 3075-3083 (2009)
http://dx.doi.org/10.1364/AO.48.003075


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Abstract

We have designed and characterized a mid-IR spectrometer built around a pulsed distributed-feedback quantum cascade laser using the characteristic frequency down-chirp to scan through the spectral region 6.5 cm 1 spectral region. The behavior of this chirp is extensively measured. The accuracy and detection limits of the system as an absorption spectrometer are demonstrated first by measuring spectra of acetylene through a single pass 16 cm absorption cell in real time at low concentrations and atmospheric pressure. The smallest detectable peak is measured to be 1.5 × 10 4 absorbance units, yielding a minimum detectable concentration length product of 2.4 parts per million meter at standard temperature and pressure. This system is then used to detect acetylene within an ethylene–air opposed flow flame. Measurements of acetylene content as a function of height above the fuel source are presented, as well as measurements of acetylene produced in fuel breakdown as a function of preinjection fuel temperature.

© 2009 Optical Society of America

OCIS Codes
(300.1030) Spectroscopy : Absorption
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6340) Spectroscopy : Spectroscopy, infrared
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: October 30, 2008
Revised Manuscript: April 24, 2009
Manuscript Accepted: May 1, 2009
Published: May 26, 2009

Citation
Zachary R. Quine and Kevin L. McNesby, "Acetylene measurement in flames by chirp-based quantum cascade laser spectrometry," Appl. Opt. 48, 3075-3083 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-16-3075

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