Optics: measuring and testing – By monitoring of webs or thread – For flaws or imperfections
Patent
1977-03-28
1979-11-06
McGraw, Vincent P.
Optics: measuring and testing
By monitoring of webs or thread
For flaws or imperfections
250563, G01N 2102
Patent
active
041734416
ABSTRACT:
An inspection system for web materials, including electronic means responsive to means scanning the web for detecting a plurality of nonuniform appearance features of the web; means for discriminating these appearance features as to class to identify the significant electrical signal components thereof; means for electrically dividing the web into overlapping areas; means for counting the number of occurrences of the significant signal components over a series of scans within each of the overlapping areas; means for comparing each count with predetermined values to electrically define nonuniform appearance features according to area; and means for combining these nonuniform appearance features to recognize the occurrence of a visual defect class as it occurs within each overlapping area.
REFERENCES:
patent: 3618063 (1971-11-01), Johnson
patent: 3843890 (1974-10-01), Anthony, Jr. et al.
patent: 3898469 (1975-08-01), Nichols
E. I. Du Pont de Nemours and Company
McGraw Vincent P.
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