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Applied Optics

Applied Optics


  • Vol. 40, Iss. 33 — Nov. 20, 2001
  • pp: 6136–6144

CO2 imaging with saturated planar laser-induced vibrational fluorescence

Brian J. Kirby and Ronald K. Hanson  »View Author Affiliations

Applied Optics, Vol. 40, Issue 33, pp. 6136-6144 (2001)

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We present new vibrational (infrared) planar laser-induced fluorescence (PLIF) imaging techniques for CO2 that use a simple, inexpensive, high-pulse-energy transversely excited atmospheric CO2 laser to saturate a CO2 absorption transition at 10.6 µm. Strong excitation by use of a CO2 laser provides increased signal levels at flame temperatures and simplifies image interpretation. Because rotational energy transfer and intramodal vibrational energy transfer are fast, vibrational distributions can be approximated by use of a simple three-temperature model. Imaging results from a 425 K unsteady transverse CO2 jet and a laminar coflowing CO/H2 diffusion flame with temperatures near 1500 K are presented. If needed, temperature-insensitive signal levels can be generated with a two-laser technique. These results illustrate the potential for saturated infrared PLIF in a variety of flows.

© 2001 Optical Society of America

OCIS Codes
(260.2510) Physical optics : Fluorescence
(300.2530) Spectroscopy : Fluorescence, laser-induced
(300.6340) Spectroscopy : Spectroscopy, infrared

Original Manuscript: January 22, 2001
Revised Manuscript: July 23, 2001
Published: November 20, 2001

Brian J. Kirby and Ronald K. Hanson, "CO2 imaging with saturated planar laser-induced vibrational fluorescence," Appl. Opt. 40, 6136-6144 (2001)

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