Device for continuously inspecting a surface

Details Device for continuously inspecting a surface Device for continuously inspecting a surface

1979-12-18

1981-08-18

Corbin, John K.

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

258563, G01N 2186

Patent

active

042843570

ABSTRACT:
A device for inspecting the surface of an article such as a moving paper web by scanning a bent surface of the object tangentially with a laser light beam. The scanned beam is received and converted into an electrical signal in which peaks therein above a pre-set level represent defects in the object. A servo feedback circuit is disclosed for maintaining the position of the scanning beam constant with respect to the inspected surface of the object despite variations in the position of the mechanism conveying the object.

REFERENCES:
patent: 1963128 (1934-06-01), Geister
patent: 3618063 (1971-11-01), Johnson

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