Optics: measuring and testing – By monitoring of webs or thread – For flaws or imperfections
Patent
1995-04-03
1997-06-24
Rosenberger, Richard A.
Optics: measuring and testing
By monitoring of webs or thread
For flaws or imperfections
356239, G01N 2188
Patent
active
056421982
ABSTRACT:
This disclosure is directed to a glass inspection system for inspecting a transparent web of glass of indeterminate length as it moves along a predetermined linear path of travel at a predetermined, regulated and/or controlled speed. The web of glass is illuminated such that any defect in or upon the glass web appears as a shadow moving upon a relatively white/bright background. A number of high resolution CCD cameras "look" downwardly through the transparent glass web and are focused upon the white background to detect moving defect shadows. Each camera creates a succession of image fields or frames through which a shadow of a defect will pass as the defect moves with the glass web through the scan area of each CCD camera. Each image field defines a nominal light area and each defect shadow is depicted as a defect area of light differing from the nominal light of each image field area. Initially, a first image area is scanned to detect the presence of a first light area/shadow at a first position which might be indicative of a defect shadow created by an "apparent" defect moving with the transparent glass web. Subsequently, a second image field is scanned at a second predetermined position to detect the presence of the first defect light area or shadow at the downstream second position commensurate with the speed of movement of the transparent glass body. If the first defect light area detected at the first position is present and is detected at the downstream second position, the latter confirms the existence of the defect, as opposed to the possibility of a spurious first scan, dirt rather than a defect on or in the glass, etc.
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