Single image corrections to facilitate planar imaging of particle concentration in particle-laden fluids
Date
2012
Authors
Cheong, M.
Birzer, C.
Lau, T.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Conference paper
Citation
Proceedings of the 18th Australasian Fluid Mechanics Conference, 3-7 Dec 2012, Lauceston, Tasmania, Australia / P. A. Brandner and B. W. Pearce (eds.), 4 p.
Statement of Responsibility
M. C. Cheong, C. H. Birzer and T. Lau
Conference Name
Australasian Fluid Mechanics Conference (18th : 2012 : Launceston, Tasmania)
Abstract
Planar Nephelometry is a laser-based technique capable of providing instantaneous planar local number density measurements of particles in fluid systems. This technique records laser light scattered from particles to obtain information regarding particle concentration. Planar Nephelometry does not need to resolve particles individually, thus enabling large image viewing areas. However, when particle loadings are sufficiently high, attenuation of the incident laser beam becomes significant. As Planar Nephelometry infers particle concentration from incident laser intensity, attenuation can result in erroneous concentration measurements. Planar Nephelometry measurements under these conditions must thus be corrected for laser attenuation to ensure accurate concentration measurements. Experiments were conducted on suspensions of neutral density spherical particles in water at various homogeneous concentrations. The attenuation correction method implemented is a ray-based extinction model which incorporates the use of scattered light from a polymer strip at a down-beam location. This method is suitable for highly turbulent flows requiring instantaneous planar information since single shot images are used in the post-processing work. The derived correction method provides an alternative to Beer-Lambert’s law for attenuation corrections in laser diagnostics techniques. The proposed method is validated experimentally using non-homogenous particle distributions in fluid suspensions.
School/Discipline
Dissertation Note
Provenance
Description
Access Status
Rights
Copyright status unknown