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Verfahren zur Bestimmung der Oberflaechentemperatur eines Werkstuecks bei dessen Bearbeitung mit Laserstrahlung und Vorrichtung zur Durchfuehrung des Verfahrens

Process for the measurement of the surface temperature of a workpiece and its machining by means of laser beams and device for implementing the process
 
: Drenker, A.; Kramer, R.; Wissenbach, K.

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Frontpage ()

DE 1989-3926540 A: 19890811
DE 1989-3926540 A: 19890811
DE 3926540 C2: 19921224
B23K0026
Deutsch
Patent, Elektronische Publikation
Fraunhofer ILT ()

Abstract
Process for the radiation of coated workpieces with laser beams, in which the surface temperature of the radiated workpiece area (20), in particular a processing area, is measured. In order to be able to measure the workpiece temperature (<-2 ) in the processing area (20) under a coating (12) of the workpiece surface, the process is implemented in such a way that the laser radiation is power-modulated at a low level of modulation in relation to its radiation power (P<-L), and that, in order to measure the temperature (<-2 ) of the workpiece circumference (13) covered by at least one coating (12), a temperature value (<-b ) is deducted from the measured surface temperature (<-0 ) of the coating (12), said temperature value being being calculated from the product of the laser radiation power (P<-L) absorbed by the workpiece (10) and the heat resistance (R<-th02) of the heat flow through the layer (12) into the workpiece (10) by the thermal substitution image o f each workpiece (10).

: http://publica.fraunhofer.de/dokumente/PX-39044.html