Non-contact perforation/pinhole detection system for opaque vess

Details Non-contact perforation/pinhole detection system for opaque vess Non-contact perforation/pinhole detection system for opaque vess

1994-09-01

1995-09-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356240, G01N 904

Patent

active

054517737

ABSTRACT:
A system for detecting a side wall perforation in containers operates non-invasively and at line speeds. A stream of similar containers are communicated to an inspection area. An exterior of each container is illuminated while the container is in the inspection area. Light from an interior of the container is focused, via a lens, to a video camera. Any perforate flaw in the container walls results in a point source of light in the container interior. Since the perforations are relatively small, the point source is created due to diffractive properties of the slit perforation. These diffractive properties facilitate obtaining an image of the flaw from the camera disposed to the interior of the container when the camera is mounted orthogonally to the perforation or parallel to the wall being inspected. In an other embodiment, the relative positions of the light source and camera are interchanged. A method for container inspection is also provided in connection with the afore-noted structure.

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