Precitec Gmbh & Co. Kg

Matthias Strebel

Markus Kogel-Hollacher

Andreas Rudolf

Axel Hatwig

A measuring device determines a distance between a processing head for a laser processing system configured to process a workpiece with a laser beam and the workpiece. The measuring device includes an optical coherence tomograph to measure a distance between the processing head and workpiece. In the optical coherence tomograph, measuring light generated by a measuring light source and reflected by the workpiece interferes with measuring light reflected in a reference arm with two or more reference stages. The stages include a first reference stage configured such that the measuring light reflected therein travels a first optical path length, and a second reference stage configured such that the measuring light reflected therein travels a second optical path length different from the first length, wherein the measuring light reflected by the workpiece interferes with reflected measuring light of the first reference stage and reflected measuring light of the second reference stage.

Measuring device for determining a distance between a laser processing head and a workpiece, laser processing system including the same and method for determining a distance between a laser processing head and a workpiece

The invention pertains to a laser machining system includes first deflection optics, second deflection optics, and a coupling device. The first deflection optics deflect a machining laser beam in two directions in space. The second deflection optics deflect a measuring beam in two directions in space independently of the machining laser beam. The coupling device is arranged in a beam path of the machining laser beam and couples the measuring beam into the beam path of the machining laser beam.

Laser machining system and laser machining method

The invention pertains to measuring, adjusting and/or controlling a distance between a machining head, particularly a laser machining head, and a workpiece, comprising a measurement light source, a beam splitter that splits the light of the measurement light source into a measurement light beam and a reference light beam, a reference arm, through which the reference light beam is guided, an optical system for coupling the measurement light beam into a processing beam path featuring a focusing lens, an optical device for superimposing the measurement light beam, and a measurement and evaluation unit.

Method and device for measuring and controlling a distance between a machining head and a workpiece

Embodiments pertain measuring the weld penetration depth, particularly in welding, drilling or machining processes carried out by means of a working laser beam, wherein a measurement light beam of a sensor system is coupled into a processing beam path of the working laser beam in a laser machining head and bundled or focused into a measurement light spot on the surface of a workpiece by means of focusing optics of the processing beam path. The measurement light beam reflected on the surface of the workpiece is then returned to a measurement and evaluation unit of the sensor system in order to obtain information on the distance of the surface of the workpiece from the laser machining head. In order to obtain a surface profile of the workpiece in the region of the vapor capillary, from which the position of the vapor capillary relative to the point of incidence of the working laser beam can be determined, the position of the measurement light spot on the surface of the workpiece is guided over the vapor capillary in the welding direction, as well as transverse to the welding direction. The measurement light spot is during the subsequent laser machining process moved into the determined position of the vapor capillary in order to measure the weld penetration depth.

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Gaggenau, Germany

Matthias Strebel