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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 32 — Nov. 10, 2009
  • pp: 6332–6343

Comparison of line-peak and line-scanning excitation in two-color laser-induced-fluorescence thermometry of OH

Stanislav Kostka, Sukesh Roy, Patrick J. Lakusta, Terrence R. Meyer, Michael W. Renfro, James R. Gord, and Richard Branam  »View Author Affiliations


Applied Optics, Vol. 48, Issue 32, pp. 6332-6343 (2009)
http://dx.doi.org/10.1364/AO.48.006332


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Abstract

Two-line laser-induced-fluorescence (LIF) thermometry is commonly employed to generate instantaneous planar maps of temperature in unsteady flames. The use of line scanning to extract the ratio of integrated intensities is less common because it precludes instantaneous measurements. Recent advances in the energy output of high-speed, ultraviolet, optical parameter oscillators have made possible the rapid scanning of molecular rovibrational transitions and, hence, the potential to extract information on gas-phase temperatures. In the current study, two-line OH LIF thermometry is performed in a well-calibrated reacting flow for the purpose of comparing the relative accuracy of various line-pair selections from the literature and quantifying the differences between peak-intensity and spectrally integrated line ratios. Investigated are the effects of collisional quenching, laser absorption, and the integration width for partial scanning of closely spaced lines on the measured temperatures. Data from excitation scans are compared with theoretical line shapes, and experimentally derived temperatures are compared with numerical predictions that were previously validated using coherent anti-Stokes–Raman scattering. Ratios of four pairs of transitions in the A 2 Σ + X 2 Π (1,0) band of OH are collected in an atmospheric-pressure, near-adiabatic hydrogen-air flame over a wide range of equivalence ratios—from 0.4 to 1.4. It is observed that measured temperatures based on the ratio of Q 1 ( 14 ) / Q 1 ( 5 ) transition lines result in the best accuracy and that line scanning improves the measurement accuracy by as much as threefold at low-equivalence-ratio, low-temperature conditions. These results provide a comprehensive analysis of the procedures required to ensure accurate two-line LIF measurements in reacting flows over a wide range of conditions.

© 2009 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(120.6780) Instrumentation, measurement, and metrology : Temperature
(300.2530) Spectroscopy : Fluorescence, laser-induced

ToC Category:
Spectroscopy

History
Original Manuscript: May 26, 2009
Revised Manuscript: September 18, 2009
Manuscript Accepted: October 16, 2009
Published: November 6, 2009

Citation
Stanislav Kostka, Sukesh Roy, Patrick J. Lakusta, Terrence R. Meyer, Michael W. Renfro, James R. Gord, and Richard Branam, "Comparison of line-peak and line-scanning excitation in two-color laser-induced-fluorescence thermometry of OH," Appl. Opt. 48, 6332-6343 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-32-6332


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