摘要 |
<p>The method involves moving a testing head (6) relative to a testing contour e.g. recess (2a) in a running direction. Longitudinal positions of the contour are recorded from different angles, where the angles are observed in a side view towards the running direction of the testing contour. The contour is covered in the process direction. Images of the contour are received from optical sensors (12, 12`). Check is made whether an image has a small irregularity, which is in the form of a hole. An independent claim is also included for a testing head comprising optical sensors.</p> |