| 摘要 |
A method is described for process control during a drilling process, a laser drilling process in particular. While a laser beam is affecting an area of a workpiece, the measuring beam is directed onto the borehole being drilled within this area. As soon as a breakthrough has been produced in the borehole, the measuring beam is able to pass through the borehole and to be detected by a sensor. This measuring beam is detected by a sensor. It can thus be accurately determined whether and when a breakthrough occurred.
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