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Applied Optics

Applied Optics


  • Vol. 44, Iss. 24 — Aug. 22, 2005
  • pp: 5105–5111

Use of laser-induced ionization to detect soot inception in premixed flames

Samuel L. Manzello, Eui Ju Lee, and George W. Mulholland  »View Author Affiliations

Applied Optics, Vol. 44, Issue 24, pp. 5105-5111 (2005)

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Experimental measurements of laser-induced ionization were performed for ethene–air premixed flames operated near the soot inception point. Soot was ionized with a pulsed laser operated at 532 nm. The ionization signal was collected with a tungsten electrode located in the postflame region. Ionization signals were collected by use of both single-electrode and dual-electrode configurations. Earlier laser-induced-ionization studies focused on the use of a single biased electrode to generate the electric field, with the burner head serving as the path to ground. In many practical combustion systems, a path to ground is not readily available. To apply the laser-induced-ionization diagnostic to these geometries, a dual-electrode geometry must be employed. The influence of electrode configuration, flame equivalence ratio, and flame height on ionization signal detection was determined. The efficacy of the laser-induced-ionization diagnostic in detecting soot inception in the postflame region of a premixed flame by use of a dual-electrode configuration was investigated. Of the dual-electrode configurations tested, the dual-electrode geometry oriented parallel to the laser beam was observed to be most sensitive for detecting the soot inception point in a premixed flame.

© 2005 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics

Original Manuscript: November 23, 2004
Revised Manuscript: March 11, 2005
Manuscript Accepted: March 11, 2005
Published: August 20, 2005

Samuel L. Manzello, Eui Ju Lee, and George W. Mulholland, "Use of laser-induced ionization to detect soot inception in premixed flames," Appl. Opt. 44, 5105-5111 (2005)

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