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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 45, Iss. 20 — Jul. 10, 2006
  • pp: 4982–4989

Laser-induced fluorescence of ketones at elevated temperatures for pressures up to 20 bars by using a 248 nm excitation laser wavelength: experiments and model improvements

Andreas Braeuer, Frank Beyrau, and Alfred Leipertz  »View Author Affiliations

Applied Optics, Vol. 45, Issue 20, pp. 4982-4989 (2006)

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Laser-induced fluorescence of acetone and 3-pentanone for a 248   nm excitation wavelength was investigated for conditions relevant for internal combustion engines regarding temperature, pressure, and gas composition. An optically accessible calibration chamber with continuous gas flow was operated by using CO 2 and air as a bath gas. According to the varying pressure and temperature conditions during the compression stroke of a spark ignition engine, fluorescence experiments were performed under isothermal pressure variations from 1 to 20 bars for different temperatures between 293   and   700   K . The ketone fluorescence behavior predictions, based on a model previously developed by Thurber et al. [Appl. Opt. 37, 4963 (1998)], were found to overestimate the pressure-related fluorescence increase for high temperature and small wavelength excitation at 248   nm . The parameters influencing the model only in the large vibrational energy regime were newly adjusted, which resulted in an improved model with a better agreement with the experiment. The model's validity for excitation at larger wavelengths was not influenced. For the air bath gas an additional collision and vibrational energy sensitive quenching rate was implemented in the model for both tracers, acetone and 3-pentanone.

© 2006 Optical Society of America

OCIS Codes
(260.2510) Physical optics : Fluorescence
(280.1740) Remote sensing and sensors : Combustion diagnostics
(280.2490) Remote sensing and sensors : Flow diagnostics
(300.2530) Spectroscopy : Fluorescence, laser-induced

Original Manuscript: July 28, 2005
Revised Manuscript: January 18, 2006
Manuscript Accepted: February 7, 2006

Andreas Braeuer, Frank Beyrau, and Alfred Leipertz, "Laser-induced fluorescence of ketones at elevated temperatures for pressures up to 20 bars by using a 248 nm excitation laser wavelength: experiments and model improvements," Appl. Opt. 45, 4982-4989 (2006)

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