Method and apparatus for illuminating and imaging a can end coat

Details Method and apparatus for illuminating and imaging a can end coat Method and apparatus for illuminating and imaging a can end coat

1996-01-11

1998-09-08

Font, Frank G.

Optics: measuring and testing

Inspection of flaws or impurities

Containers or enclosures

G01N 2100

Patent

active

058052798

ABSTRACT:
A can end to be inspected, including a portion coated by a sealing material, is illuminated by polarized light. The light reflected from the object and sealing material is viewed by a camera through a polarizing filter. The polarizing filter blocks out polarized light reflected by the can end and sealing material that does not contain any defects, but passes light reflected by the sealing material that has been depolarized by a defect in the sealing material.

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