Temperature field measurement as quality assurance measure in case of laser material processing

Jurca, Marius; Langer, H.-J.

doi:10.1016/j.phpro.2010.08.075

Cited by 4 publications

(1 citation statement)

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“…Jurca et al [17] employed a cutting head with three attached optical fibers to detect the nozzle to workpiece distance and the radiation from the process zone, the latter being used to calculate the temperature in the process zone, thereby monitoring the process. However, detailed experiments to prove the ability to detect cutting interruptions were not performed.…”

Section: Introductionmentioning

confidence: 99%

Optical Cutting Interruption Sensor for Fiber Lasers

Adelmann

Schleier

Neumeier³

et al. 2015

Applied Sciences

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Abstract: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. OPEN ACCESSAppl. Sci. 2015, 5 545

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Section: Introductionmentioning

confidence: 99%

Optical Cutting Interruption Sensor for Fiber Lasers

Adelmann

Schleier

Neumeier³

et al. 2015

Applied Sciences

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Novel noncontact temperature fiber sensor for multi-spot field measurements

Jurca¹,

Urs²

2010

2010 International Symposium on Optomechatronic Technologies

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Photodiode-based cutting interruption sensor for near-infrared lasers

Adelmann

Schleier

Neumeier³

et al. 2016

Appl. Opt.

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We report on a photodiode-based sensor system to detect cutting interruptions during laser cutting with a fiber laser. An InGaAs diode records the thermal radiation from the process zone with a ring mirror and optical filter arrangement mounted between a collimation unit and a cutting head. The photodiode current is digitalized with a sample rate of 20 kHz and filtered with a Chebyshev Type I filter. From the measured signal during the piercing, a threshold value is calculated. When the diode signal exceeds this threshold during cutting, a cutting interruption is indicated. This method is applied to sensor signals from cutting mild steel, stainless steel, and aluminum, as well as different material thicknesses and also laser flame cutting, showing the possibility to detect cutting interruptions in a broad variety of applications. In a series of 83 incomplete cuts, every cutting interruption is successfully detected (alpha error of 0%), while no cutting interruption is reported in 266 complete cuts (beta error of 0%). With this remarkable high detection rate and low error rate, the possibility to work with different materials and thicknesses in combination with the easy mounting of the sensor unit also to existing cutting machines highlight the enormous potential for this sensor system in industrial applications.

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Temperature field measurement as quality assurance measure in case of laser material processing

Cited by 4 publications

References 0 publications

Optical Cutting Interruption Sensor for Fiber Lasers

Optical Cutting Interruption Sensor for Fiber Lasers

Novel noncontact temperature fiber sensor for multi-spot field measurements

Photodiode-based cutting interruption sensor for near-infrared lasers

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