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.
Similar content being viewed by others
References
Brunel M, Coetmellec S, Gréhan G, Shen H (2014) Interferometric out-of-focus imaging simulator for irregular rough particles. J Eur Opt Soc 9:14008
Formin NA (1998) Speckle photography for fluid mechanics measurements. Springer-Verlag, Berlin Heidelberg
González Ruiz S, Vetrano MR, van Beeck J (2014) Feasibility of using the glory and the speckle pattern for sizing of spherical and irregular particles. Appl Opt 53:4722–4728
Goodman JW (1975) Statistical properties of laser speckle patterns. Laser speckle and related phenomena. Springer-Verlag, Heidelberg, pp 9–75
Hecht E (2002) Optics. Pearson education, Addison-Wesley
Onori F, Barbosa S (2013) Optical particle characterization. Laser metrology in fluid mechanics. Wiley, Hoboken, pp 67–158
Tropea C (2011) Optical particle characterization in flows. Annu Rev Fluid Mech 43:399–426
Ulanowski Z, Hirst E, Kaye PH, Greenway RS (2012) Retrieving the size of particles with rough and complex surfaces from two-dimensional scattering patterns. J Quant Spectrosc Radiat Transfer 113:2457–2464
van Beeck JPAJ, Riethmuller ML (1996) Rainbow phenomena applied to the measurement of droplet size and velocity and to the detection of nonsphericity. Appl Opt 35:2259–2266
van de Hulst HC (1957) Light scattering by small particles. Dover Publications, New York
van de Hulst HC, Wang RT (1991) Glare points. Appl Opt 30(33):4755–4763
Author information
Authors and Affiliations
Corresponding author
Electronic supplementary material
Below is the link to the electronic supplementary material.
Rights and permissions
About this article
Cite this article
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
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1007/s00348-014-1851-0