METHOD AND DEVICE FOR DETERMINING THE GEOMETRY OF STRUCTURES BY MEANS OF COMPUTER TOMOGRAPHY

摘要

The invention relates to a method for determining the geometry of a structure on an object at least by using a computer tomography sensor system comprising at least a radiation source, a mechanical axis of rotation, and a detector, preferably a planar detector, wherein surface measurement points are generated by the computer tomography sensor system, for example in the region of material transitions. In order to select the surface measurement points to be used for the determination of a geometry feature by using any target geometry, in particular without the availability of a CAD model being necessary, according to the invention, in order to determine the geometry features, surface measurement points are used which are associated with the geometry features to be determined on the basis of specifiable rules and the geometry features are determined from the associated surface measurement points.

主权项

1. A method for determining the geometry of a structure on an object such as a workpiece or a tool at least by using a computer tomography sensor system comprising at least a radiation source, a mechanical axis of rotation, and a detector, preferably a planar detector, the computer tomography sensor system generating surface measurement points, preferably in the region of material transitions,
characterized in that, in order to determine the geometry features, surface measurement points are associated with the geometry features to be determined on the basis of specifiable rules, such as preferably consideration of the specified geometry, particularly preferably the consideration of the surface vector of the specified geometry, wherein the specified geometry of the features is defined by measuring a master part and/or using one or more geometric elements and/or using at least one parameter set and/or using geometric elements manually defined at least roughly by the user, wherein the specified geometry is preferably determined by a best fit of the measurement points used for the definition or of the points taken from the parameter sets, and the geometry features are determined from the associated surface measurement points, preferably by means of a best fit.