Optical inspection of transparent containers using infrared and

Optics: measuring and testing – Inspection of flaws or impurities – Containers or enclosures

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Details

356 73, 356239, 356365, 250223, 2502081, 250225, G01N 2100, G01N 904, G01J 400, H01L 2700

Patent

active

060671556

ABSTRACT:
Infrared and visible light energies are directed through a container onto a CCD camera that is responsive to both the visible and infrared light energy. Crossed polarizers are positioned on opposed sides of the container, and operate on the visible light energy in such a way as to block transmission of visible light to the camera in the absence of stress variations in the container, which alter polarization of the visible light energy traveling through the container. On the other hand, the polarizers have little or no effect on the infrared light energy, which creates a normally gray intensity of background light at the camera. In this way, incidence of visible light on the camera due to stress variations in the container appears as a bright signal against a normally gray background, while blockage of infrared light due to opaque variations in the container appears as a dark signal against the normally gray background.

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