Volume Graphics Gmbh

Bundesrepublik Deutschland, Vertreten Durch Das Bundesministerium Fur Wirtschaft Und Energie, Dieses Vertreten Durch Den Prasidenten Der Physikalisch-technischen Bundesanstalt

Physikalisch-technische Bundesanstalt

Bundesrepublik Deutschland, Vertreten Durch Das Bundesmisterium Für Wirtschaft Und Energie, Endvertreten Durch Den Präsidenten Der Ptb

Markus Bartscher

Christoph Poliwoda

Thomas Günther

Christof Reinhart

Jens Illemann

Torsten Schönfeld

Computer-implemented methods for monitoring the functional state of a system for the computer-tomographic examination of workpieces by carrying out one or more computer-tomographic measurements on the workpiece. The measurements each result here in at least one measured value for at least one measurement variable. The method for monitoring the functional state selects measured values for at least one measurement variable from at least two measurements on one or more workpieces. At least one degree of variation for the selected measured values of the at least one measurement variable as well as at least one reference degree of variation for measured values of the at least one measurement variable is determined. The functional state of the system is determined by comparing the at least one determined degree of variation with the at least one reference degree of variation for the at least one measurement variable.

Method for monitoring the functional state of a system for computer-tomographic examination of workpieces

The invention relates to a method for dimensional measurement by way of X-ray computed tomography, featuring the steps (a) Irradiating a test object () with non-monochromatic X-ray radiation from a virtually punctiform X-ray source (), (b) measuring the intensity (I) of the X-ray radiation () in the radiation path behind the test object () by means of a detector () which has a plurality of pixels (P) to obtain pixel-dependent intensity data (I(P)), and (c) calculating at least one dimension (H) of the test object () using the pixel-dependent intensity data (I(P)). According to the invention, the pixel-dependent intensity data (I(P)) is corrected by the influence of an effective penetration depth (&#x3c4;) on the detector and/or a displacement of the effective source location (Q) on a target () of the X-ray source ().

Method for dimensional x-ray measurement, in particular by computed tomography, and x-ray computed tomography scanner

The invention relates to a method and a device for processing a volumetric image record. The method comprises the following steps: carrying out a non-optical image scanning method on an object to be analysed and generating a volumetric image record and extracting the object contour from the volumetric image record in order to determine the position of the object surface; defining an object surface point and a surrounding area for said object surface point and analysing the grey tones within the surrounding area; calculating a quality value, which reflects the localised quality of the surface, for the object surface point on the basis of the grey-tone analysis. The device comprises equipment for carrying out the method.

Determination of localised quality measurements from a volumetric image record

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Edemissen, Germany

Markus Bartscher