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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 28 — Oct. 1, 2012
  • pp: 6864–6869

Flame temperature measurements by radar resonance-enhanced multiphoton ionization of molecular oxygen

Yue Wu, Jordan Sawyer, Zhili Zhang, and Steven F. Adams  »View Author Affiliations

Applied Optics, Vol. 51, Issue 28, pp. 6864-6869 (2012)

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Here we report nonintrusive local rotational temperature measurements of molecular oxygen, based on coherent microwave scattering (radar) from resonance-enhanced multiphoton ionization (REMPI) in room air and hydrogen/air flames. Analyses of the rotational line strengths of the two-photon molecular oxygen C3Π(v=2)X3Σ(v=0) transition have been used to determine the hyperfine rotational state distribution of the ground X3Σ(v=0) state. Rotationally resolved 2+1 REMPI spectra of the molecular oxygen C3Π(v=2)X3Σ(v=0) transition at different temperatures were obtained experimentally by radar REMPI. Rotational temperatures have been determined from the resulting Boltzmann plots. The measurements in general had an accuracy of ±60K in the hydrogen/air flames at various equivalence ratios. Discussions about the decreased accuracy for the temperature measurement at elevated temperatures have been presented.

© 2012 Optical Society of America

OCIS Codes
(120.6780) Instrumentation, measurement, and metrology : Temperature
(280.2470) Remote sensing and sensors : Flames
(300.6350) Spectroscopy : Spectroscopy, ionization
(300.6410) Spectroscopy : Spectroscopy, multiphoton

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: June 6, 2012
Revised Manuscript: August 29, 2012
Manuscript Accepted: August 30, 2012
Published: September 28, 2012

Yue Wu, Jordan Sawyer, Zhili Zhang, and Steven F. Adams, "Flame temperature measurements by radar resonance-enhanced multiphoton ionization of molecular oxygen," Appl. Opt. 51, 6864-6869 (2012)

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