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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 12 — Apr. 20, 1999
  • pp: 2478–2485

Two-dimensional imaging of soot volume fraction in laminar diffusion flames

David R. Snelling, Kevin A. Thomson, Gregory J. Smallwood, and Ömer L. Gülder  »View Author Affiliations


Applied Optics, Vol. 38, Issue 12, pp. 2478-2485 (1999)
http://dx.doi.org/10.1364/AO.38.002478


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Abstract

A technique for acquiring two-dimensional soot-volume-fraction measurements in laminar flames has been demonstrated. The technique provides a map of very low noise concentration over a range of wavelengths (250–1100 nm). A noise level of 0.0007 in extinction and a spatial resolution of 30–40 µm for soot concentration were achieved with an arc lamp source that was filtered to provide greater spatial coherence and a CCD detector. The broadband arc lamp source also allowed us to avoid the added noise resulting from speckle with coherent laser sources. Beam steering, due to refractive-index gradients in the flame, was measured and compared with theoretical predictions. The optical arrangement to minimize the effect of beam steering is described. As a result the beam steering had no effect on the soot measurements in the flames examined. Flame-transmission maps obtained with this system in an ethylene/air laminar diffusion flame are presented. Tomographic analysis from use of an Abel inversion of the line-of-sight data to obtain radial profiles of soot concentration is described.

© 1999 Optical Society of America

OCIS Codes
(110.0110) Imaging systems : Imaging systems
(110.4280) Imaging systems : Noise in imaging systems
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics

History
Original Manuscript: July 8, 1998
Revised Manuscript: October 14, 1998
Published: April 20, 1999

Citation
David R. Snelling, Kevin A. Thomson, Gregory J. Smallwood, and Ömer L. Gülder, "Two-dimensional imaging of soot volume fraction in laminar diffusion flames," Appl. Opt. 38, 2478-2485 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-12-2478

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