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Proceedings Paper

Modelization, performance evaluation, and experimental validation of a new drops granulometry optical measurement method
Author(s): Sandrine Roques; Pascal Churoux; Yvan Aubry; Christian Lopez
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Paper Abstract

In particle size measurement by imaging methods, two types of illumination are encountered: coherent and non-coherent. For both the analyzed volume is limited by out of focus effects. The aim of our study is to turn away that limitation by a morphological analysis of particle images obtained with a configuration close to in-line Gabor holography. Fringe pattern appears in these images and it is no longer comparable to non-coherent shadowgraphy images which become fuzzy with out of focus positions of the object. A simulation of the image formation has been performed thanks to a model. The diameter of the spherical particle and its z position from the focus plane are parameters of the model. Particle sizing will be derived from original morphologic criteria inferred from the fringes. These criteria can be defined and validated by simulation and experimental results. This paper presents: the model and its characteristics, a comparison of experimental and simulated images, and the morphological analysis for different particle sizes and positions.

Paper Details

Date Published: 10 September 1999
PDF: 7 pages
Proc. SPIE 3827, Diagnostic Imaging Technologies and Industrial Applications, (10 September 1999); doi: 10.1117/12.361003
Show Author Affiliations
Sandrine Roques, ONERA and Aerospatiale Airbus (France)
Pascal Churoux, ONERA (France)
Yvan Aubry, ONERA (France)
Christian Lopez, Aerospatiale Airbus (France)

Published in SPIE Proceedings Vol. 3827:
Diagnostic Imaging Technologies and Industrial Applications
Jorma Lammasniemi; Herbert Wiggenhauser; Gerhard Busse; Bruce G. Batchelor; Wolfgang Poelzleitner; Gerd Dobmann, Editor(s)

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