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Patent attributes
Patent Applicant
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
September 25, 2018
Patent Application Number
15821780
Date Filed
November 23, 2017
Patent Citations Received
Patent Primary Examiner
Patent 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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