Optics: measuring and testing – By monitoring of webs or thread – For flaws or imperfections
Patent
1998-12-08
2000-07-04
Rosenberger, Richard A.
Optics: measuring and testing
By monitoring of webs or thread
For flaws or imperfections
3562382, G01N 21898
Patent
active
06084681&
ABSTRACT:
An optical web defect detection system includes a light source and a detector disposed with respect to the light source so that the detector receives light modulated by a web moving proximate the light source. The detector outputs a signal corresponding to the modulated light. The detector may include a plurality of fiber optic elements having ends arranged in a group aligned generally parallel to the orientation of a defect in the web. A control mechanism is in operative communication with the detector to receive the signal therefrom. The control mechanism may include a signal processing stage and a defect detection stage that receives a signal modified by the signal processing stage and compares the modified signal to a predetermined criteria to determine whether a defect occurs in the web. The control mechanism may automatically adjust the signal processing stage to modify the attribute with respect to the criteria so that the defect detection stage thereafter identifies a predetermined change in the attribute of the modified signal as a defect.
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