| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a monitoring method and monitoring device, which is comparatively simple and cost-efficient for realization and yet allows a highly reliable monitoring of moving objects. <P>SOLUTION: A method and a device for monitoring objects (2) that are moved along a trajectory (T) with a relative distance (D) from each other are provided. The objects comprise a section (4) that is transparent or translucent in the visible light spectrum, wherein a light beam (8) is directed transverse to the trajectory (T) such that the objects (2) subsequently cross the light beam (8) at the section (4), and wherein light from the light beam (8) is detected by a detector (7). In order to improve the monitoring reliability in a cost-efficient manner, the invention proposes that the light beam (8) comprises light at a wavelength range that is substantially untransmittable through the section (4), and that the presence and/or absence of an object (2) is determined on the basis of a transitional time period during which no light is detected and/or during which light within the untransmittable wavelength range is detected by the detector (7). <P>COPYRIGHT: (C)2013,JPO&INPIT |
