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Irregular particle sizing using speckle pattern for continuous wave laser applications

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Abstract

A technique to retrieve the size of irregular particles using the speckle pattern produced from the scattering of laser light is presented. A sizing algorithm based on the maximum curvature peak detection of the Fourier transform of the speckle pattern is introduced, and its application to sand particles with and without motion is studied, using a continuous wave laser. The sizes obtained with this algorithm are in good agreement with the sizes resulting from shadowgraph measurements. It was also observed that the properties of the speckle pattern are independent on the scattering angle. When using a continuous wave laser, special attention is paid to the exposure time while recording the speckle pattern. This special care avoids the images to be blurred as a consequence of the speckle pattern displacement and reshaping due to particle rotation. Finally, further recommendations to define the setup parameters are given in order to apply the technique, focusing on a continuous wave application.

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Authors and Affiliations

  1. von Karman Institute for Fluid Dynamics, Chaussée de Waterloo 72, 1640, Rhode-St-Genèse, Belgium

    Pedro García Carrascal, Sara González Ruiz & Jeroen van Beeck

Authors
  1. Pedro García Carrascal
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  2. Sara González Ruiz
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  3. Jeroen van Beeck
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Corresponding author

Correspondence to Pedro García Carrascal.

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García Carrascal, P., González Ruiz, S. & van Beeck, J. Irregular particle sizing using speckle pattern for continuous wave laser applications. Exp Fluids 55, 1851 (2014). https://doi.org/10.1007/s00348-014-1851-0

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  • DOI: https://doi.org/10.1007/s00348-014-1851-0

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