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23 July 2003 Characterization of flowing particles with dynamic light scattering
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The non-invasive optical technique of dynamic light scattering (DLS) is routinely used to characterize dilute and transparent sub-micron particle dispersions in laboratory environments. A variety of industrial and biological applications would however greatly benefit from on-line monitoring of dispersions under flowing conditions. In this paper we present a model experiment to study flowing dispersions of polystyrene latex particles of varying sizes under varying flow conditions using a newly developed fiber optic DLS probe. A modified correlation function proposed in an earlier study by Chowdhury et al. is applied to the analysis of extracting size and velocity of laminar flowing particulate dispersions. The complimentary technique of laser Doppler velocimetry is also used to measure the speed of moving particles to confirm the DLS findings.
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Alfred B. Leung, Kwang I. Suh, and Rafat R. Ansari "Characterization of flowing particles with dynamic light scattering", Proc. SPIE 4965, Optical Diagnostics and Sensing in Biomedicine III, (23 July 2003);

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