Carl Zeiss Industrielle Messtechnik Gmbh

Steffen Kunzmann

Thomas Engel

Dominik Seitz

Tobias Held

Werner Lotze

Andreas Lotze

Hubert Lettenbauer

Steffen Strauß

Martin Withalm

A work piece is measured by at least one point of a surface of the work piece being sampled by a feeler. The feeler exerts a probing force on the surface and the feeler is deflected relative to a mounting of the feeler. On the basis of the deflection, a position of the point of the surface is determined. A directional dependence of a flexibility of the feeler is determined and/or is known. The feeler and the work piece are positioned and/or oriented relative to each other, while taking into consideration the directional dependence, such that during sampling of the point of the surface unintentional slipping of the feeler on the surface does not occur, or occurs only with low probability, or an unintentional deviation of the feeler from an intended path on the surface does not occur, or occurs only with low probability.

Method for measuring a work piece, calibration method and coordinate measuring device

A reference measurement object having known properties is used for the purpose of calibrating a coordinate measuring machine. A plurality of reference measured values are picked up on the reference measurement object. Calibration data are determined using the reference measured values and using the known properties of the reference measurement object. The calibration data comprises a first number of polynomial coefficients that are selected to correct nonlinear measuring errors using at least one polynomial transformation. The first number of polynomial coefficients is reduced in an iterative method to a lesser second number, with a plurality of pairs of polynomial coefficients being formed and with a polynomial coefficient of a pair being eliminated in each case when a statistical dependence between the polynomial coefficients of the pair is greater than a defined threshold value.

Method for calibrating a coordinate measuring machine

In a method for measuring mechanical workpieces by tomography, a workpiece and radiation penetrating the workpiece are moved relative to one another step-by-step. A two-dimensional image of the workpiece is generated in an imaging plane from the interaction of the workpiece and the radiation in each movement position of the workpiece. In addition, a three-dimensional representation of the workpiece is computed from the two-dimensional images. From at least two two-dimensional images showing a regular actual structure existing within the workpiece, points at a high-contrast transition are registered. A three-dimensional equivalent body is determined from the position of the points, and said equivalent body is compared to a predefined nominal structure.

Method for the tomographic measurement of mechanical workpieces

A method and a device determine material interfaces in a test object. The novel method generates three-dimensional image data of the test object or uses already existing three-dimensional image data of the test object. Image values of the image data are, or were, obtained by invasive radiation. An evaluation line for evaluating the image data relative to the test object is determined, a location of a material interface of the test object is determined by evaluating the image data of image values along the evaluation line so that the value of the first partial derivative of the image values in the direction of the evaluation line has a local maximum at the location of the material interface.

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Dresden, Germany

Steffen Kunzmann