Apparatus and method for detecting holes in sheet material

Details Apparatus and method for detecting holes in sheet material Apparatus and method for detecting holes in sheet material

1980-04-29

1982-04-06

Rosenberger, R. A.

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

250572, G01N 2189

Patent

active

043233112

ABSTRACT:
Method and apparatus for detecting holes in sheet material such as tin plate where a beam from a laser is scanned across the sheet by a mirror drum, successive scans being arranged to strike the sheet material from upstream and downstream, and the light passing through a hole in the sheet material is received by a perspex light guide and passed to a photodetector.

REFERENCES:
patent: 4011457 (1977-03-01), Wolf
patent: 4118127 (1978-10-01), Klein et al.
patent: 4173441 (1979-11-01), Wolf

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