Device for detecting irregularities in a moving sheet material

Details Device for detecting irregularities in a moving sheet material Device for detecting irregularities in a moving sheet material

1978-06-29

1980-10-07

Corbin, John K.

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

250572, G01N 2132

Patent

active

042265380

ABSTRACT:
Device and method for the optical inspection of speck-like and streaklike defects in a moving web.
A source of radiation illuminates a transverse zone of the web, a series of photocells measures the radiation after transmission through, or reflection from the web, and a grating arrangement modulates the radiation received by the photocells, thereby to modulate the output signal of each cell by an A.C. component.

REFERENCES:
patent: 3206606 (1965-09-01), Burgo et al.
patent: 3740152 (1973-06-01), Iisuka
patent: 3859538 (1975-01-01), Mannonen

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