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Proceedings Paper

Coherent backscattering of light from a polydisperse random medium as a model of fractal aggregations of particles
Author(s): Toshiaki Iwai; Katsuhiro Ishii; Toshimitsu Asakura
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Paper Abstract

The reproducible models of biomedical optics, the measurements of chemical compounds, the aggregations of particles and so on require the statistical space-time properties of the multiply scattered light in laboratories to be analyzed quantitatively. A cluster-cluster structure in fractal media is replaced with a polydisperse random medium by renormalizing a cluster to a particle. As the particle size-distributions, a simple summation of particles with two radii, a Gaussian function and a power law function were used in numerical simulations. The light scattered from particles inside a cluster affects a decreasing rate of the backscattering intensity cone but not a relaxation time of autocorrelation functions of the time- varying intensity. On the contrary, the movement of the cluster affects strongly the relaxation time through the diffusion constant but not a decreasing rate of the backscattering intensity enhancement. As a result, it is concluded that the temporal autocorrelation functions of the time-varying light intensity scattered multiply from the cluster-cluster structure are applicable to measure the averaged cluster size of aggregations.

Paper Details

Date Published: 19 June 1998
PDF: 9 pages
Proc. SPIE 3252, Optical Diagnostics of Biological Fluids III, (19 June 1998); doi: 10.1117/12.311880
Show Author Affiliations
Toshiaki Iwai, Hokkaido Univ. (Japan)
Katsuhiro Ishii, Hokkaido Univ. (Japan)
Toshimitsu Asakura, Hokkai-Gakuen Univ. (Japan)


Published in SPIE Proceedings Vol. 3252:
Optical Diagnostics of Biological Fluids III
Alexander V. Priezzhev; Toshimitsu Asakura; J. David Briers, Editor(s)

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