The Web Inspection System uses line scan machine vision and proprietary software to detect defects of in wide format, continuous-run manufacturing operations.
In this example, the system is configured to detect defects on long runs of fiber glass strands that are used in the manufacture of large wind turbine blades.
The test material is creamy in color. 93 Rods of roughly 7.3mm width around 150um spacing are fed thru the inspection system. These rods are glued onto a web from behind.
Blue collimated line lights was chosen for this application. This achieves better focus/sharpness because of its lower wavelength. Collimated line light helped reduce the illumination of the rod walls.
The material was front illuminated, and the cameras looked at specular reflection. The surface of the rods reflected most of the light appearing bright and the gaps either transmitted most of the light or scattered them thus registering much darker.
We made a 2-axis camera gimbal to rotate the camera in the yaw and roll axis to align all 4 cameras.