Method and apparatus for detecting glass particles in glass...

G - Physics – 01 – N

Patent

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G01N 21/90 (2006.01)

Patent

CA 2234217

This invention provides method and apparatus (100) for detecting small glass particles (12) in bottles (1) filled with beer (10). The beer (10) is caused to rotate with respect to the bottle (1), and successive images are obtained from the bottle by means of a CCD-camera (40) which is arranged such that its optical axis (41) makes an angle a of about 135° with the axis (13) of the bottle (1), which is illuminated from below. The successive images are subtracted from each other to detect refracted light emanating from glass particles. These measurements are repeated a plurality of times. The invention thus offers an improvement in sensitivity and reliability of a detecting method. An apparatus (100) comprises a carousel (103) with a plurality of cameras dedicated to a single bottle. A system is described to reduce costs by having eight cameras share one image processing unit.

L'invention porte sur un procédé de détection de petites particules de verre (12) dans des bouteilles (1) pleines de bière (10) ainsi que sur l'appareil correspondant (100). On met la bière (10) en rotation dans la bouteille (1) et l'on prend une série d'images de la bouteille à l'aide d'une caméra à dispositif de couplage de charge (40) disposée de manière à ce que son axe optique (41) forme un angle alpha d'environ 135 DEG par rapport à l'axe (13) de la bouteille (1) éclairée du bas. On soustrait les images successives les unes des autres pour détecter la lumière provenant de particules de verre et l'on répète ces mesures à plusieurs reprises. Cette invention permet ainsi d'augmenter la sensibilité et d'accroître la fiabilité d'un procédé de détection. Selon l'invention, un appareil (100) comporte un carrousel (103) pourvu de plusieurs caméras affectées à une seule bouteille. Il est également décrit un système visant à diminuer les coûts au titre duquel huit caméras se partagent une unité de traitement d'image.

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