Calibration of laser light section sensors during simultaneous measurement

摘要

Method for measuring an extruded profile using a measuring apparatus, wherein the measuring apparatus is designed to produce and measure at least two laser light sections on a surface of the profile, which is being pulled through the measuring apparatus, by means of at least one laser light section sensor from a respective, different position around the profile, wherein the at least two laser light sections are situated essentially in one plane. By positioning at least two references and/or reference markers from the adjacent positions together with the extruded profile in a respective common measurement capture area, said references or reference markers are used for calibration of respective raw image of the at least one laser light section sensor. Thus, the calibrated raw image data are correctly mapped in a common coordinate system from the respective position.

主权项

1. Method for measuring a sheet-metal or extruded profile with a measuring device which is adapted to generate and to measure at least two laser light sections on a surface of the extruded profile when the extruded profile is guided through the measuring device, the method comprising the steps of:
a) arranging at least one laser light section sensor in a respective first and second position around the extruded profile, wherein the at least two laser light sections are generated within two respective laser light section planes that are offset in parallel from each other just so far to be measured independently from each other, the planes forming a common measurement recording region; b) measuring the laser light sections on the extruded profile from the respective first and second position using the at least one laser light section sensor thereby obtaining first position raw image data and forwarding the first position raw image data to a computing unit, wherein the first position raw image data are used as first position calibrated image data; c) arranging and measuring at least two references in the common measurement recording region from the first position and from the second position, wherein the respective reference is from the extruded profile or from a reference marker arranged between the respective position of the at least one laser light section sensor and the extruded profile; d) by the computing unit, determining a shift-and a rotation angle of the respective reference within second position raw image data at the second position with reference to the first position calibrated image data; e) by the computing unit, calculating a transformation matrix from the shifting and from the rotation angle determined in step d), and applying the transformation matrix to the second position raw image data to obtain second position calibrated image data, wherein the recorded references in the second position calibrated image data match the recorded references in the first position calibrated image data in a common coordinate system; and f) by the computing unit, outputting and using all calibrated image data in the common coordinate system to determine the extruded profile.