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2.5D Dome Light Photometric Stereo Area-Scan Lighting System

Product Description

4-zone/8-zone optional, with a maximum light-emitting area diameter of up to 600 mm. Compared with coaxial 2.5D area-scan photometric stereo lighting systems, it delivers better performance on concave/convex defects and surface flaws on complex curved surfaces.

Product Features

◆ Suitable for inspection of small-sized planar and curved surfaces, highly reflective concave/convex features, and surface flaws.

◆ 4-zone or 8-zone optional + time-sharing stroboscopic control

◆ Dome-shaped diffuse multi-directional time-sharing illumination

◆ Diffuse uniform illumination, mitigating specular glare hotspots

◆ Separation of texture and concave/convex defects, reducing false detections

◆ Native area-scan camera compatibility, full-field imaging in a single shot

◆ Soft illumination, preserving edge details

◆ Multi-channel high-precision timing synchronization control

The figure below shows the lighting setup for embossed characters on a capsule packaging box at a pharmaceutical company. The embossed characters are in a recessed state, and the surface on which the characters are located is reflective, with a raised center in a slightly arched shape. Using 90-degree ring light and four-sided bar lights at ultra-low angles, the effect can be achieved when the lower surface of the light source is lower than the medicine box, but the uniformity is not ideal. Coaxial lighting can also reveal the characters, but due to the slightly arched surface, the reflection is severe.

The upper part of the figure below shows the lighting effect with 90° ring light, and the lower part shows the lighting effect with the dome light photometric stereo area-scan system. The effect is very ideal and quite algorithm-friendly.

Lighting effect for embossed characters on pill capsule packaging boxes

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