Apparatus for web defect detection including a web swatch that c

Details Apparatus for web defect detection including a web swatch that c Apparatus for web defect detection including a web swatch that c

1975-08-06

1976-07-20

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250572, 356200, G01N 2132

Patent

active

039708578

ABSTRACT:
An improved web scanning inspection system that includes a fixed standard web swatch containing representative objectionable defects in the path of the scan beam at the onset of each scan in order to calibrate inspection system discriminator thresholds. Gating and logic circuits are arranged to extract amplitude and duration characteristics of the defect related portions of the signals generated by scans across the standard swatch material. These are then used to actuate an alarm whenever the inspection system discriminator circuits fail to detect the objectional defects in the standard web swatch.

REFERENCES:
patent: 3061731 (1962-10-01), Thier et al.
patent: 3646353 (1970-10-01), Bhullar et al.
patent: 3843890 (1974-10-01), Anthony, Jr. et al.

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