Method and device for compensating beam angle variations of a beam bundle of laser beams generated by a diffractive optical element
AssigneeVITRONIC Dr.-Ing. Stein Bildverarbeitungssysteme GmbH
InventorsKonstantin Ott, Burghard Hoffmann
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Abstract
A method for compensating beam angle variation of a beam bundle of laser beams with respective beam angles includes generating the beam bundle using a diffractive optical element, determining a beam angle value from a beam angle of at least one laser beam of a first subset of the laser beams, detecting a light pattern projected by a second subset of the laser beams, and evaluating the light pattern. The evaluation is performed taking into account the beam angle variation of the beam angles of the second subset of the laser beams on the basis of the determined beam angle value.
Claims12
A method for compensating beam angle variation of a beam bundle of laser beams with respective beam angles, the method comprising:
- generating the beam bundle using a diffractive optical element;
- determining a beam angle value from a beam angle of at least one laser beam of a first subset of the laser beams using at least one optical position sensor arranged at a predetermined distance from the diffractive optical element, wherein the beam angle value is determined based on a measurement of the at least one optical position sensor detecting the beam angle of the at least one laser beam of the first subset of the laser beams and the predetermined distance from the diffractive optical element to the at least one optical position sensor;
- detecting a light pattern projected by a second subset of the laser beams;
- and
- evaluating the light pattern, wherein the evaluation is performed taking into account the beam angle variation of the beam angles of the second subset of the laser beams based on the determined beam angle value.
An assembly for compensating beam angle variation of a beam bundle of laser beams with respective beam angles, the assembly comprising:
- a diffractive optical element for generating the beam bundle of the laser beams;
- a first sensor arrangement comprising at least one optical position sensor for determining a beam angle value from the beam angle of at least one of the laser beams of a first subset of the laser beams, the first sensor arrangement having a predetermined distance from the diffractive optical element;
- a second sensor arrangement for detecting a light pattern projected by a second subset of the laser beams;
- and
- a processing device for evaluating the light pattern, wherein the processing device is adapted to evaluate the light pattern taking into account the beam angle variation of the beam angles of the second subset of the laser beams based on the determined beam angle value, wherein the first sensor arrangement and the diffractive optical element are both assigned to an illumination, wherein only the second subset of the laser beams emerges from the illumination for projecting the light pattern, and wherein the first subset of the laser beams reaches the first sensor arrangement after travelling the predetermined distance from the diffractive optical element along the illumination.
Dependencies are inferred from the claim text.