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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 21 — Jul. 20, 2000
  • pp: 3683–3690

Laser-induced incandescence for soot particle size measurements in premixed flat flames

Boman Axelsson, Robert Collin, and Per-Erik Bengtsson  »View Author Affiliations


Applied Optics, Vol. 39, Issue 21, pp. 3683-3690 (2000)
http://dx.doi.org/10.1364/AO.39.003683


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Abstract

Measurements of soot properties by means of laser-induced incandescence (LII) and combined scattering–extinction were performed in well-characterized premixed ethylene–air flames. In particular, the possibility of using LII as a tool for quantitative particle sizing was investigated. Particle sizes were evaluated from the temporal decay of the LII signal combined with heat balance modeling of laser-heated particles, and these sizes were compared with the particle sizes deduced from scattering–extinction measurements based on isotropic sphere theory. The correspondence was good early in the soot-formation process but less good at later stages, possibly because aggregation to clusters began to occur. A critical analysis has been made of how uncertainties in different parameters, both experimental and in the model, affect the evaluated particle sizes for LII. A sensitivity analysis of the LII model identified the ambient-flame temperature as a major source of uncertainty in the evaluated particle size, a conclusion that was supported by an analysis based on temporal LII profiles.

© 2000 Optical Society of America

OCIS Codes
(140.3460) Lasers and laser optics : Lasers
(280.1740) Remote sensing and sensors : Combustion diagnostics
(280.2470) Remote sensing and sensors : Flames

History
Original Manuscript: September 24, 1999
Revised Manuscript: April 28, 2000
Published: July 20, 2000

Citation
Boman Axelsson, Robert Collin, and Per-Erik Bengtsson, "Laser-induced incandescence for soot particle size measurements in premixed flat flames," Appl. Opt. 39, 3683-3690 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-21-3683

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