Abstract: A method and a system for determining a 6-DOF-pose of an object in space use an optical-tracking marker attached to the object. The marker comprises an inner marker area having a circular contour with a known radius and a marker pattern defining at least one characteristic marker feature. A camera image of the marker typically shows an elliptical representation of the circular contour and the marker pattern. Based on the image, parameters describing the elliptical representation are determined and the 6-DOF-pose of the marker in space is derived using the parameters.

Abstract: A method for determining one or more errors of a rotational position establishment system is provided. More particularly, a rotary apparatus having first and second parts that rotate relative to one another about a rotation axis of the rotary apparatus is used to determine one or more rotation errors. A rotation position determination system is used to determine rotation position errors from the rotation positions of the rotary apparatus or a change in the rotation position of the rotary apparatus, and from rotation positions of a reference rotary apparatus or a change in the rotation position of the reference rotary apparatus.

Abstract: The invention is directed to a method for measuring an internal thread of a workpiece with a coordinate measuring apparatus and a CCD or CMOS sensor. The sensor records at least two images of a section of the internal thread and the recording conditions for the two images are modified. The data from these two recorded images are used to establish the position, orientation, core diameter and/or the pitch of the internal thread. The invention is also directed to an arrangement for measuring an internal thread of a workpiece and includes a coordinate measuring apparatus and the CCD or CMOS sensor in accordance with the above method.

Abstract: A lens device for an illumination assembly, wherein the lens device comprises at least one ring region, wherein each ring region extends along a circumferential direction about a central axis of the lens device, wherein each ring region comprises a plurality of segments, wherein each segment forms a circular arc portion of a respective ring region and wherein each segment comprises a first end in the circumferential direction and a second end opposite to the first end in the circumferential direction, wherein each segment has a first refractive index at a reference wavelength at the first end at a first radial distance from the central axis and a second refractive index at the reference wavelength at the second end at the first radial distance, said second refractive index differing from the first refractive index. An illumination assembly, a coordinate measuring machine and a method are also disclosed.

Abstract: A device has a displaceable device part, a drive, which is configured to drive the displaceable device part and to thus induce a movement in the displaceable device part, and a control unit, which is connected to the drive and is configured to control the drive. The device further has a first signal transmitter for determining a position and/or speed of the displaceable device part. The first signal transmitter and/or a first signal evaluation device, which is connected to the signal transmitter, are connected to the control unit such that the control unit receives information from the signal transmitter about the position and/or speed of the displaceable device part during operation of the device and controls the drive on the basis of the information received. A second signal transmitter of the device serves to monitor and/or redundantly determine the position and/or speed of the displaceable device part.

Abstract: A light-emitting table suitable for use in metrology includes a plurality of light sources and a field to be illuminated. Light-emitting centers of the light sources represent starting points of light source axes which perpendicularly intersect the field to be illuminated. The light-emitting centers of the light sources on one side and the field to be illuminated on the other side delimit an intermediate space in the interior of the light-emitting table. Located between the light source axes within the intermediate space are curved and mirrored surfaces, the focal points or caustics (K) of which are located within the intermediate space between the curved and mirrored surfaces and the field to be illuminated. A coordinate measuring machine for capturing the coordinates of a workpiece includes at least one optical sensor and a light-emitting table for illuminating the workpiece during measurement of the coordinates of the workpiece using the sensor.

Abstract: A method and a measuring machine for determining dimensional properties of a measurement object each use a workpiece table and a camera having an image sensor and an imaging optics. The imaging optics exhibits aberrations and is configured to be focused on a plurality of different working positions relative to the workpiece table. The aberrations are minimized by using first calibration values provided for a defined working position. A first working distance of the camera relative to a region of interest is determined. Subsequently, the imaging optics is focused, using the first working distance and using second calibration values that represent an image field curvature of the camera, such that the region of interest is substantially brought into a defined working position. Subsequently, the image recording and image evaluation take place to determine measurement values that represent the dimensional properties of the measurement object in the region of interest.

Abstract: A test body is provided for determining one or more rotation errors of a rotating apparatus with respect to one or more degrees of freedom of movement, in which a real rotating movement of the rotating apparatus differs from an ideal rotating movement. The test body includes a holder which, together with a part of the rotating apparatus, can be rotated about an axis of rotation. The holder can be configured to arrange or fasten the test body with respect to the axis of rotation about which the test body can be rotated for the purpose of determining the rotation error(s). One or more test elements are rigidly connected to the holder or are formed on the holder, and each of the test elements is used to determine a rotation error with respect to one or more of the degrees of freedom of movement.

Abstract: The invention relates to a method and a device for generating at least one virtual image of a measurement object, in which a virtual position and/or a virtual orientation of the measurement object is determined and a virtual position and/or virtual orientation of at least one imaging or image recording device of a coordinate measuring machine is determined. The virtual image is generated on the basis of geometric data of the measurement object and on the basis of optical properties of the measurement object and the virtual image is additionally generated on the basis of imaging parameters of the imaging or image recording device.

Abstract: A coordinate measuring machine has a workpiece support for holding a measurement object and a measuring head which can be displaced relative to the workpiece support. The measuring head carries an optical sensor. An evaluation and control unit is configured to determine spatial coordinates on the measurement object depending on a position of the measuring head relative to the workpiece support and depending on sensor data from the optical sensor. The optical sensor includes a lens assembly and a camera. The lens assembly comprises at least four separate lens-element groups. Three of these separate lens-element groups can be displaced along the optical axis of the lens assembly. A first lens-element group is arranged fixed in the region of the light-entry opening of the lens assembly. The coordinate measuring machine with the above-described lens assembly allows individual variation of magnification, focusing and resolution.

Abstract: A position of a turntable axis is repeatedly determined in the device coordinate system of a coordinate measuring device. A test body on the turntable is probed in a plurality of turntable positions in order to determine the X and Y coordinates of the turntable axis in the device coordinate system from the contact points. In addition, a first contact body reference point that is stationary relative to the X-axis and disposed next to the turntable is probed to determine its X coordinate. Similarly, a second contact body reference point that is stationary relative to the Y-axis is probed to determine its Y coordinate. These steps are repeated at one or more later points in time to repeatedly determine the X coordinate and the Y coordinate of the turntable axis from the X coordinate of the first contact-body reference point and the Y coordinate of the second contact-body reference point.

Abstract: An arrangement measures coordinates of a workpiece and/or machines the workpiece. The arrangement has a first part and a second part that can be moved relative to the first part. The relative mobility of the first and second parts is specified in addition to a possible mobility of a probe that is optionally additionally fixed to the arrangement. The mobility of the probe is specified by a deflection of the probe from a neutral position during a mechanical probing of the workpiece for the purpose of measuring the coordinates. A measuring body is arranged on the first or second part, and at least one sensor is arranged on the other part, i.e. on the second or first part. The sensor generates a measurement signal corresponding to a position of the measuring body and thus corresponding to the relative position of the first and second part.

Abstract: A method for ascertaining a correction value for monitoring a fluid bearing of a coordinate measuring machine or other machine tool. Also disclosed is a coordinate measuring machine having at least one fluid bearing. The machine further includes a first element and a second element which are supported against each other by means of at least one fluid bearing. In addition, a control device is provided for controlling the machine. A quantity representing a pressure in the at least one fluid bearing is ascertained as a function of a position and/or orientation of the first element relative to the second element. A correction value for a pressure in the at least one fluid bearing is determined for the position and/or orientation of the first element relative to the second element. The correction value is then stored in the control device, and subsequently used for machining or measuring a workpiece.

Abstract: An illumination module for a coordinate measuring machine for measuring a workpiece by means of an optical sensor, wherein the illumination module comprises a main body having a sensor side and a workpiece side, wherein the sensor side has a first interface device at least for the sensor-side coupling of the illumination module in a defined position, and wherein the illumination module comprises at least one illumination arrangement for illuminating the workpiece. Furthermore, the main body has the form of a ring having a free central region and an edge region, wherein the at least one illumination arrangement and the first interface device are arranged in the edge region.

Abstract: A measuring device and corresponding method for measuring a measurement object, comprising an illumination device for illuminating the measurement object with an illumination pattern, a pattern generation device with at least one pattern generating element for bringing about a positionally variant intensity distribution of the illumination pattern, and an optical sensor arrangement for detecting the illumination pattern reflected and/or scattered by the measurement object. The measuring device has an optics which is telecentric at least on the measurement object side and is arranged in a beam path from the illumination device to the measurement object. The optical sensor arrangement detects the illumination pattern through at least one part of the telecentric optics. The pattern generating device is designed in such a way that the illumination pattern has a positionally and/or spectrally variant vertex focal length distribution on the measurement object side.

Abstract: A coordinate measuring apparatus for measuring a workpiece having a workpiece surface includes a sensor to capture the workpiece surface and a mechanism to move the sensor in coordinate directions (x, y, z) relative to the workpiece. The mechanism includes a rigid frame, a mount and measuring skids. The rigid frame includes mutually parallel horizontal longitudinal members having respective horizontal guides. The rigid frame includes vertical supports having respective upper and lower ends. The horizontal longitudinal members are rigidly connected to the upper ends of the vertical supports. The rigid frame includes transverse members oriented transverse to the longitudinal members and being rigidly connected to the lower end of the vertical supports. The transverse members are supported via the mount and a first one of the measuring skids is configured to move the sensor in the coordinate direction (x) along the first and second horizontal guides.

Abstract: An illumination module for a coordinate measuring machine for measuring a workpiece by means of an optical sensor, wherein the illumination module comprises a main body having a sensor side and a workpiece side, wherein the illumination module comprises on the main body at least one illumination arrangement for illuminating the workpiece, and wherein the at least one illumination arrangement has an emission characteristic with a specific emission angle and a light intensity profile within the emission angle, wherein the light intensity profile of the at least one illumination arrangement within the emission angle is asymmetrical. The present invention furthermore relates to a coordinate measuring machine comprising such an illumination module.

Abstract: A measuring apparatus and method for determining dimensional characteristics of a measurement object use a sensor head in order to register desired measurement points on the measurement object. The sensor head comprises a polychromatic light source for generating light having various wavelengths of light, a spectrometer, and an optical system having at least one lens element. The optical system produces a first defined range of color dependent foci and a second defined range of color dependent foci in front of the at least one lens element. The spectrometer generates a first spectral information when the measurement object is in the first defined range, and it generates a second spectral information when the measurement object is in the second defined range. An evaluation unit exploits the first spectral range in a coarse measurement mode, and it exploits the second spectral range in a fine measurement mode.

Abstract: A method reduces errors in a turning device during a determination of coordinates of a work piece or during machining of the work piece. The turning device allows a rotational movement of the work piece about a rotation axis of the turning device. The method includes measuring errors in the turning device on account of deviations between actual positions and actual orientations of the rotation axis, on the one hand, and corresponding ideal positions and ideal orientations of the rotation axis, on the other hand, in a range of rotation angles. Expected error values of the turning device are determined from error measurements and are used to correct the turning device.

Abstract: A method for coupling a first system component and a second system component of a coordinate measuring device for determining by means of at least one sensor the three-dimensional coordinates of an object to be measured. An interface arrangement is provided between the first system component and the second system component. The interface arrangement comprises an electrical interface, formed from at least two electrical transmission paths, for transmitting a first electrical voltage between the first system component and the second system component, and at least one optical interface formed from light waveguides. The at least one sensor is supplied with the first electrical voltage via the two electrical transmission paths of the electrical interface. An analog measurement signal from the sensor is converted into a digital measurement signal. The digital measurement signal is transmitted by means of the light waveguides of the optical interface.