| 摘要 |
The invention relates to a sensor device for detecting radiation from the region of a zone of interaction ( 16 ) between a laser beam and a workpiece ( 17 ) for monitoring a laser machining operation and a workpiece, in particular a laser welding operation, and a device for monitoring the laser machining operation, in particular the laser welding operation, and a laser machining head having such a sensor device. The sensor device possesses a radiation-sensitive receiver arrangement and an imaging device which images a region to be observed in the region of a zone of interaction ( 16 ) onto the receiver arrangement. In order to achieve a compact and space-saving structure it is provided that the imaging device comprises a focusing mirror arranged in the working beam pathway of the laser beam which diverts radiation from the region to be observed out of the working beam pathway and focuses it onto the receiver arrangement.
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