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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 29 — Oct. 10, 2007
  • pp: 7227–7236

Corrections to facilitate planar imaging of particle concentration in particle-laden flows using Mie scattering. Part 2: Diverging laser sheets

Peter A. M. Kalt and Graham J. Nathan  »View Author Affiliations


Applied Optics, Vol. 46, Issue 29, pp. 7227-7236 (2007)
http://dx.doi.org/10.1364/AO.46.007227


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Abstract

Part 1 describes a model to account for the effect of particles on laser sheet attenuation in flows where particles are heterogeneously distributed and where particles are small compared with the imaged volume. Here we extend the model to account for the effect of a strongly diverging light sheet, which is desirable when investigating many turbulent flows, e.g., in two-phase combustion problems. A calibration constant, C κ , is derived to account for the attenuation of the incident laser sheet due to extinction of the laser beam through a seeded medium. This is shown to be effective in correcting both the effect of in-plane laser sheet attenuation and out-of-plane signal trapping due to particles in a jet flow heavily seeded with 5 g / s of 25 40   μm spherical particles. In the uncorrected case, attenuation causes up to 15% error in the mean concentration and 35% error on the rms fluctuations. Selecting an appropriate C κ was found to remove the error in the mean concentration and reduce error on the rms fluctuation by half. Methods to estimate or measure an appropriate value of C κ are also presented.

© 2007 Optical Society of America

OCIS Codes
(100.2000) Image processing : Digital image processing
(110.2970) Imaging systems : Image detection systems
(290.5850) Scattering : Scattering, particles

ToC Category:
Scattering

History
Original Manuscript: May 2, 2007
Revised Manuscript: August 12, 2007
Manuscript Accepted: August 20, 2007
Published: October 5, 2007

Citation
Peter A. M. Kalt and Graham J. Nathan, "Corrections to facilitate planar imaging of particle concentration in particle-laden flows using Mie scattering. Part 2: Diverging laser sheets," Appl. Opt. 46, 7227-7236 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-29-7227


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References

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