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Conference papers

Measuring the size distribution of acicular crystals by image analysis from in situ video probe

Abstract : The batch cooling crystallization of ammonium oxalate (AO) in water was investigated in order to design a dynamic model of the process in both pure and impure solvent. The solute concentration was measured using in situ ATR FTIR spectroscopy while the solid dispersed phase was monitored through in situ image acquisition, using an immersed CCD video probe. In order to evaluate the particle size distribution (PSD) an algorithm for the processing of video 2D images of AO crystals was developed. The algorithm is intended to enable reliable crystal size measurements; the specificity of the system under investigation being related to the acicular shape of AO crystals. In particular, a major difficulty arises from the many overlapping particles which have to be differentiated prior to their size measurement. After segmentation, the identification of particles was mostly based upon a refined method for the detection of corners followed by the reconstruction of the crystals perimeters. The efficiency of the method was evaluated through comparison between the automatic image processing measurements and measurements performed by a trained human operator. More than 80% of AO particles are satisfactorily detected in suspension, even fuzzy crystals, provided that their corners are unbroken.
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Submitted on : Tuesday, January 10, 2012 - 11:14:19 AM
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Ola Ahmad, Johan Debayle, Nesrine Gherras, Gilles Févotte, Jean-Charles Pinoli. Measuring the size distribution of acicular crystals by image analysis from in situ video probe. XIII° Congrès de la SFGP 2011 Société Française de Génie des Procédés : Des procédés au service du produit au coeur de l'Europe, Nov 2011, Lille, France. pp.N°403. ⟨hal-00658289⟩

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