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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Glenn D. Boreman
  • Vol. 44, Iss. 31 — Nov. 1, 2005
  • pp: 6557–6564

Use of Rayleigh imaging and ray tracing to correct for beam-steering effects in turbulent flames

Sebastian A. Kaiser, Jonathan H. Frank, and Marshall B. Long  »View Author Affiliations


Applied Optics, Vol. 44, Issue 31, pp. 6557-6564 (2005)
http://dx.doi.org/10.1364/AO.44.006557


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Abstract

Laser Rayleigh imaging has been applied in a number of flow and flame studies to measure concentration or temperature distributions. Rayleigh cross sections are dependent on the index of refraction of the scattering medium. The same index of refraction changes that provide contrast in Rayleigh images can also deflect the illuminating laser sheet. By applying a ray-tracing algorithm to the detected image, it is possible to correct for some of these beam-steering effects and thereby improve the accuracy of the measured field. Additionally, the quantification of the degree of beam steering through the flow provides information on the degradation of spatial resolution in the measurement. Application of the technique in a well-studied laboratory flame is presented, along with analysis of the effects of image noise and spatial resolution on the effectiveness of the algorithm.

© 2005 Optical Society of America

OCIS Codes
(100.2000) Image processing : Digital image processing
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(290.5870) Scattering : Scattering, Rayleigh

History
Original Manuscript: February 2, 2005
Revised Manuscript: May 19, 2005
Manuscript Accepted: May 20, 2005
Published: November 1, 2005

Citation
Sebastian A. Kaiser, Jonathan H. Frank, and Marshall B. Long, "Use of Rayleigh imaging and ray tracing to correct for beam-steering effects in turbulent flames," Appl. Opt. 44, 6557-6564 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-31-6557

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