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Appl. Sci. 2015, 5(3), 544-554;

Optical Cutting Interruption Sensor for Fiber Lasers

Applied laser and photonics group, University of Applied Science Aschaffenburg, Wuerzburger Strasse 45, D-63743 Aschaffenburg, Germany
A.L.L. Lasersysteme GmbH, Westendstrasse 123, 80339 Munich, Germany
Author to whom correspondence should be addressed.
Academic Editor: Sergei K. Turitsyn
Received: 15 July 2015 / Revised: 21 August 2015 / Accepted: 1 September 2015 / Published: 9 September 2015
(This article belongs to the Special Issue Fibre Lasers: From Underlying Science and Technology to Applications)
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We report on an optical sensor system attached to a 4 kW fiber laser cutting machine to detect cutting interruptions. The sensor records the thermal radiation from the process zone with a modified ring mirror and optical filter arrangement, which is placed between the cutting head and the collimator. The process radiation is sensed by a Si and InGaAs diode combination with the detected signals being digitalized with 20 kHz. To demonstrate the function of the sensor, signals arising during fusion cutting of 1 mm stainless steel and mild steel with and without cutting interruptions are evaluated and typical signatures derived. In the recorded signals the piercing process, the laser switch on and switch off point and waiting period are clearly resolved. To identify the cutting interruption, the signals of both Si and InGaAs diodes are high pass filtered and the signal fluctuation ranges being subsequently calculated. Introducing a correction factor, we identify that only in case of a cutting interruption the fluctuation range of the Si diode exceeds the InGaAs diode. This characteristic signature was successfully used to detect 80 cutting interruptions of 83 incomplete cuts (alpha error 3.6%) and system recorded no cutting interruption from 110 faultless cuts (beta error of 0). This particularly high detection rate in combination with the easy integration of the sensor, highlight its potential for cutting interruption detection in industrial applications. View Full-Text
Keywords: laser cutting; cut break detector; optical sensor laser cutting; cut break detector; optical sensor

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Adelmann, B.; Schleier, M.; Neumeier, B.; Wilmann, E.; Hellmann, R. Optical Cutting Interruption Sensor for Fiber Lasers. Appl. Sci. 2015, 5, 544-554.

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