| 摘要 |
A line scanning device for detecting defects in webs of material, wherein a laser light source throws a light spot by way of an objective, a light deflector device, and a cylindrical lens onto a web of material moving parallel to its surface, the light spot periodically scanning the web at right angles to the direction of its movement and parallel to its surface, and wherein a light receiving arrangement comprising a rod light guide and at least one photoreceiver is disposed parallel to the web of material and to the direction of scanning. The rod light guide carries a step mirror arrangement on that side of its periphery lying opposite the light inlet, and a light-scattering cylindrical lens grid, the axes of whose lenses extend in the scanning direction, is disposed between the light source and the objective. |
