Apparatus for detecting faults in transparent objects

Details Apparatus for detecting faults in transparent objects Apparatus for detecting faults in transparent objects

G - Physics

01

N

350/32, 340/124.

G01N 21/17 (2006.01) G01N 21/90 (2006.01)

Patent

CA 1205886

ABSTRACT OF THE DISCLOSURE In a system for detecting faults in a glass bottle, the bottle to be inspected is placed in a path of a diffused light. A circular polarizer including a plane polarazing plate in combination with a 1/4 wave plate is disposed on the side of the source of diffused light. After passing through the bottle, the light is projected by a lens through a second circular polari- zer including a plane polarizing plate in combination with a 1/4 wave plate onto a photoelectric detector. The output signal of the photoelectric detector is subjected to analog signal pro- cessing.

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