| 摘要 |
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.
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