Inspection for foreign objects on rubber plug with droplets on it
A rubber plug with droplets on the surface is inspected for foreign objects. If the rubber plug is illuminated directly with ring lighting, any droplet on the rubber plug surface appears black and clipped highlights occur due to specular reflection from the droplet, hindering inspection. By using ring lighting equipped with a polarizing plate together with a camera fitted with a polarizing filter, the reflected light from the droplet is blocked, allowing the droplet to be ignored. Also, stacking two ring lighting units of different sizes provides uniform lighting across the rubber plug surface, and scattered light reflected from foreign objects is not blocked and reaches the camera, enabling only the foreign objects to be captured as black features.
Imaging example
Image 1: Not acceptableOnly ring lighting
Water droplets appear black, and imaging becomes impossible when they overlap with foreign objects.
Image 1: OKRing lighting with polarizing plate
Water droplets do not appear, allowing foreign objects to be captured in black.
Image 2: Not acceptableOnly ring lighting
Water droplets appear black, and imaging becomes impossible when they overlap with foreign objects.
Image 2: OKRing lighting with polarizing plate
Water droplets do not appear, allowing foreign objects to be captured in black.
Products Used
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Sensing LED Ring Lighting
OPR Series
“FALUX sensing” enables monitoring of brightness and feedback control
Application Examples for Pharmaceutical/Cosmetics
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