E.i. Dupont De Nemours and Company

Edmund H Smith, Jr

Mark E Faulhaber

William E Wolf

Michael Joseph Piovoso

Lee H Nichols, Iii

An automatic on-line computer-aided inspection system for a running web utilizing a transverse web scanning means, detection means incorporating feature extraction and processing circuitry for generating unique output signals corresponding to said web scanning characteristic of web features of inspection interest, means converting the output signals to digital data words input sequentially to a digital computer, said computer applying one or more algorithms to said words, thereby calibrating the values of said features of said words, comparing said calibrated feature values to at least one set of product-qualifying values held in memory, and means responsive to the computer classifying the web as acceptable or non-acceptable as regards areas of preselected marketable size in the web.

On-line web inspection system

A non-marking type method and apparatus for optimizing the recovery, at on-line speeds, of salvageable sheet product from a large width web, utilized in conjunction with a radiation scanning type inspection system.

Apparatus for on-line defect zoning

An electro-optical system for the repetitive repositioning of a cyclically moving beam of radiation to a preselected point in space, particularly as applied to electro-optical web inspection.

Scanning beam displacement compensation control system

An electro-optical inspection system for a binary patterned web which automatically determines registration and the quality of subjects of inspection by comparison with a master pattern stored in the memory of a computer and then passes or rejects individual subjects of inspection depending on the outcome of the comparison effected.

Binary patterned web inspection

Method and apparatus for defect identification with normalizing of the optical-electrical inspection system gain function of scans across a full width of running product web in order to facilitate defect amplitude discrimination within the uneven portions of repetitive scan signals, and then, after accumulating a preselected number of gain-normalized scans, identifying protracted duration defect-related signals by amplitude discrimination.

Defect identification with normalizing of gain function in

An automatically calibrated flying spot web inspection system adapted to detect transverse (or roll mark) defects and discriminate these defects from other defect types. Electronic circuit means responsive to a beam of radiation in either the reflection mode or the transmission mode detect and discriminate these defects from the other types.

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Wilmington, DE, United States of America

Edmund H Smith, Jr