Method and apparatus for detecting irregularities in a product
OwnerMarc Ruymeninventor
Life of this patent
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Abstract
The invention concerns a method and a device for detecting irregularities in a product, in which at least one light band (2) is directed towards this product (7), which moves in a particular direction through a detection zone, so that said light band (2) is scattered and/or reflected by said product, and the scattered light is detected by at least one detector (12, 13) in order to detect irregularities in the product and the light stream scattered by a part of the product and captured by said detector (12, 13) is adjusted so that it is independent of the position of said part in said detection zone.
Claims13
Method for detecting irregularities in a product, in which at least one light band (2), consisting of at least one laser beam or a light beam, is directed towards said product (7), which moves in a particular direction through a detection zone, in such a manner that said band (2), which moves transversely across the direction of movement of the product (7), is at least partially scattered and/or reflected by said product (7), where the scattered light is separated from the reflected light and captured at least partially by at least one detector (12, 13) in order to detect irregularities in the product, wherein the quantity of light scattered by a part of the product and captured by said detector (12, 13) is adjusted as a function of the position of said light band (2) by means of an adjusting element having an opening with a progressive narrowing in the direction of the point on which the greatest stream of scattered light (8″′) falls so that the quantity of light captured by said detector is independent of the position of said part in said detection zone and thus independent of the position of said light band (2).
Device for detecting irregularities in a product that moves in a particular direction through a detection zone, with at least one detector (12, 13) and means to generate at least one light band (2) directed towards said product (7), in such a manner that the light from said light band (2) is scattered and/or reflected by part of the product (7), where the light (8) scattered by the product (7) is separated from the reflected light and at least partially captured by said detector (12, 13), wherein, between said detector (12, 13) and the detection zone through which said product (7) has to move, said device further comprises an adjusting element (20) comprising a diaphragm (23) with an opening with a progressive narrowing in the direction of the point on which the greatest stream of scattered light (8″′) falls, wherein the diaphragm lets through only some of the light (8) scattered by a particular part of the product (7), in such a manner that the quantity of scattered light falling on said detector (12,13) is independent of the position of said part (7) in the detection zone.
Dependencies are inferred from the claim text.