G - Physics – 01 – N
Patent
G - Physics
01
N
340/123.4
G01N 21/01 (2006.01) G01N 21/89 (2006.01)
Patent
CA 1047621
APPARATUS FOR DETECTING DEFECT LOCATIONS AT THE SURFACE OF A MOVING REFLECTING MATERIAL Abstract of the Disclosure Apparatus for detecting defect locations at the surface of a moving reflecting material comprising a light source and a first optical system which directs the light thereof successively upon surface regions of the material situated along a line ex- tending essentially transversely to the direction of movement of the material. A photoelectric transducer and a second optical system are provided, the second optical system collecting the light reflected from the individual surface regions at the trans- ducer. An indicator device or mechanism which as a function of the intensity of the light reflected by each surface region produces a signal, especially an optical signal, which is associated with the relevant surface region. According to the invention the light source is a laser light source, the first optical system splits up the laser beam into an essentially two- dimensional parallel bundle of rays, the plane of which inter- sects the surface of the material to be examined approximately perpendicularly and which grazingly impinges upon the material surface, especially at an angle less than 5°, and that in the path of the rays of the light impinging upon the material there is arranged a movable diaphragm which periodically only frees individual partial regions of the planar bundle of rays.
219074
Kamber Walter
Roulier Alfred
LandOfFree
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