Method and apparatus for inspecting and sorting a stream of...

B - Operations – Transporting – 07 – C

Patent

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B07C 5/342 (2006.01)

Patent

CA 2670943

The invention concerns a method and apparatus for sorting a stream of products by scanning this stream of products with a bundle of concentrated light and analyzing the light originating from the scanned products and a background element, wherein this background element is chosen such that the corresponding detected light signal differs from the light signals originating from the products to be sorted in at least one parameter and wherein one or more control signals are generated by shifting the background level of the observed light signals to a signal level chosen such that, in the thus obtained signal, the signal level of the signal of a scanned product to be accepted distinguishes itself from the signal level of the signal of a scanned product to be rejected.

La présente invention concerne un procédé et appareil pour trier un flux de produits en balayant ce flux de produits avec un faisceau de lumière concentrée et en analysant la lumière provenant des produits balayés et un élément d'arrière-plan. Dans ledit procédé, cet élément d'arrière-plan est choisi de telle manière à ce que le signal optique détecté correspondant diffère des signaux optiques provenant des produits à trier dans au moins un paramètre. Dans ledit procédé, un ou plusieurs signaux de commande sont générés en déplaçant le niveau d'arrière-plan des signaux optiques observés à un niveau de signal choisi de telle manière à ce que, dans le signal ainsi obtenu, le niveau de signal du signal d'un produit balayé à accepter se distingue du niveau de signal du signal d'un produit à rejeter.

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