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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 35 — Dec. 10, 2009
  • pp: 6740–6753

Measurements of CO 2 concentration and temperature at high pressures using 1 f -normalized wavelength modulation spectroscopy with second harmonic detection near 2.7 μm

A. Farooq, J. B. Jeffries, and R. K. Hanson  »View Author Affiliations


Applied Optics, Vol. 48, Issue 35, pp. 6740-6753 (2009)
http://dx.doi.org/10.1364/AO.48.006740


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Abstract

Tunable diode lasers (TDL) near 2.7 μm are used to measure high-resolution direct absorption and wave length modulation with second harmonic (WMS- 2 f ) spectra at high pressures for two CO 2 transitions near 3633.08 and 3645.20 cm 1 , belonging to the ν 1 + ν 3 vibrational band. Important factors influencing the design of a high-pressure TDL sensor and the variation of WMS- 2 f line shape with changes in pressure and laser parameters are discussed. Measurements of line strength and line broadening parameters are carried out for the 3645.20 cm 1 transition in an atmospheric-pressure, high-temperature cell. A room-temperature high-pressure cell is then used to measure the pressure shift for both CO 2 transitions. Deviation of the direct absorption and wavelength division spectroscopy (WMS) spectra from the Lorentzian profile is studied in a high-density ( 9.2   amagats ) CO 2 –Ar mixture. The WMS spectra are shown to be negligibly affected by non-Lorentzian effects up to 10 atm and room temperature, in contrast with direct absorption. Measurements of CO 2 concentration and temperature are carried out in nonreactive shock-tube experiments ( P 8 12 atm , T 800 1200 K ) to validate the accuracy and precision of wavelength-modulation-spectroscopy-based sensing. CO 2 time histories are then measured in heptane ignition experiments and compared with reaction kinetics mechanisms to demonstrate the use of this sensor in high-pressure combustion systems.

© 2009 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
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(300.6340) Spectroscopy : Spectroscopy, infrared
(280.6780) Remote sensing and sensors : Temperature

ToC Category:
Spectroscopy

History
Original Manuscript: July 15, 2009
Manuscript Accepted: October 15, 2009
Published: December 2, 2009

Citation
A. Farooq, J. B. Jeffries, and R. K. Hanson, "Measurements of CO2 concentration and temperature at high pressures using 1f-normalized wavelength modulation spectroscopy with second harmonic detection near 2.7 μm," Appl. Opt. 48, 6740-6753 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-35-6740

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