| 摘要 |
<p>The device has sensors (1, 2) with a rotatable roller (6) whose end faces toward a planar element. A measuring rod i.e. charge-coupled device line sensor, is provided with a light beam, where the sensors are directed and moved opposite to each other. A light generating element is arranged on a piston rod of the sensors, where relative movement takes place between the charge-coupled device line sensor and a light source i.e. LED. A holder for the light source with a tube and a slit diaphragm is arranged in the piston rod.</p> |
