Container inspection machine

Details Container inspection machine Container inspection machine

2006-01-24

2006-01-24

An, Shawn S. (Department: 2613)

Television

Special applications

Flaw detector

C348S133000, C348S143000, C348S207110, C356S239100, C356S239400, C356S239600, C250S22300B, C250S225000

Reexamination Certificate

active

06989857

ABSTRACT:
An inspection system completes two inspections with a single camera. In one inspection polarized light illuminates the side wall of a bottle, passes through a pair of electrode surfaces on either side of a ferroelectric crystal which do not change the polarity and passes through a polarizer to image on the camera. In a second inspection the polarized light is rotated 90° by the same structure so that only light rotated as a result of stress in the bottle passes through the polarizer and images on the camera as a defect.

REFERENCES:
patent: 4002823 (1977-01-01), Van Oosterhout
patent: 5444237 (1995-08-01), Takizawa
patent: 6239869 (2001-05-01), Heuft et al.

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