Process and apparatus for detecting longitudinal faults on movin

Optics: measuring and testing – Inspection of flaws or impurities – Bore inspection

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250563, 250572, 356237, G01N 2132

Patent

active

039726240

ABSTRACT:
In a process for detecting longitudinally orientated faults on moving webs of paper or film, the web is optically scanned line by line transversely to its direction of movement and read by reflection. The scanning line is moved to and fro across the whole web at constant velocity and during a given number of scanning movements the instantaneous value of the reflected signal is interrogated at two fixed time marks within the scanning line and stored and the average values over a scanning cycle are formed separately for each of the two time marks. The average values ae indicated and recorded as faults only if a value different from the average noise value is obtained from both time marks in succession.

REFERENCES:
patent: 3510664 (1970-05-01), Nichols
patent: 3797943 (1974-03-01), Nagao et al.
patent: 3812373 (1974-05-01), Hosoe et al.

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