| 摘要 |
<p>Said device (1) has at least one temperature-dependent electrical sensor (2) absorbing part of the radiated energy and arranged around the beam in predetermined positions near the edge of the beam (3). Conclusions relating to the location of the beam can be drawn from values measured by the sensor(s). In order to ensure quick operation even in the case of variable beam diameters, the sensor (2) is moved stepwise on a predetermined path between the edge (3) and the centre (4) of the beam, the value measured by the sensor is recorded after each step and a given percentage of the maximum measured value recorded for each coordinate axis is then used as the threshold value for determining the beam edge, beam edge tangents parallel to the coordinate axes are defined on the basis of the measured values corresponding to the threshold values, and the position of the beam axis (8) corresponding to the centre of gravity (9) of the surface delimited by the beam edge tangents is then determined.</p> |
