Method and device for monitoring a protective glass
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United States of America Patent
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Sep 25, 2018
Grant Date -
May 31, 2018
app pub date -
Nov 23, 2017
filing date -
Nov 29, 2016
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Abstract
The monitoring of protective glasses in laser machining heads, which are exposed to dust, sputtering and/or soiling, with the aim of predicting the contamination of the protective glass by way of determination of its absorption rate by means of temperature monitoring. The absorption rate is determined during laser processing by using a time-resolved temperature profile of the protective glass. Either, a difference of temporal temperature gradients being present before and after switching the working laser or an amplitude arising in a frequency spectrum of the temperature profile at the switching frequency of the laser is evaluated. Upon exceeding predetermined threshold values warning and error signals, respectively, are triggered.
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