G - Physics – 01 – N
Patent
G - Physics
01
N
340/124.5
G01N 21/47 (2006.01) G01N 21/954 (2006.01)
Patent
CA 2003336
Abstract The invention relates to a method for inspecting the filling with sealing compound of a gutter present in an object, e.g. a metal lid. Such a method can according to the invention take place by carrying out the following steps: (l) providing an object to be inspected;. (2) directing a light beam on said gutter; (3) previously determining the shape of the reflection picture of at least said gutter of an object satisfying a predetermined standard; (4) determining the picture of said gutter; (5) comparing the results of steps (4) and generating a rejection signal in case of a detected deviation outside a chosen tolerance range. Should only e.g. a diverging beam be used, it can happen that a local lack of filling compound is not detected by a sensing device, since from the zone in question no reflection in the direction of the sensing device can take place as a result of shadow-effect. In view thereof according to the invention preference is given to a method which is characterized by (6) carrying out step (2) in such a way that the gutter is illuminated from two directions which are both substantially perpendicular on the axis of said gutter and forming an angle with the plain of the gutter between about 45° and 90°, and 135° and 90°, respectively. Here use is made of two beams, one divergent and one convergent, respectively.
Fetherstonhaugh & Co.
Heuft-Qualiplus B.v.
Swart Nicolaas C.
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