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: A method for operating a motion-measuring system of a machine, such as a coordinate-measuring device or a machine tool. An image-recording device arranged on a first part of the machine records at least one recorded image of a second part of the machine. The first part and the second part can be moved in relation to each other. A capturing structure, which is formed by the second part and/or which is arranged on the second part, is captured by the at least one recorded image, and, by using information about an actual appearance of the capturing structure, a speed of the relative motion of the first part and the second part is determined from differences of the at least one recorded image from the actual appearance of the capturing structure.

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 method for calibrating a rotating device attached to a movable part of a coordinate measuring device having a first part secured to the movable part and a second part rotatable relative to the first part about an axis of rotation of the turning device, on which second part a measuring sensor for measuring workpieces can be attached. The rotating device or a body connected to the second part is moved to a local area of a position determining device by a drive system of the coordinate measuring device, which position measuring device is connected to the coordinate measuring device, by means of at least one sensor of the position determining device. A position of the rotating device or of the body connected to the second part is determined relative to the position determining device, and the rotating device is calibrated in accordance with the determined position.

Abstract: A method for determining a force acting on a rotational device transverse to an axis of rotation of a rotor of the rotational device. The rotational device has a measuring system comprising a measurement body and detection devices for detecting a relative position of the detection device and the measurement body. The method comprises the following steps: producing a force which acts on the rotational device transverse to the axis of rotation of the rotor in a set rotational position, wherein the force causes a deflection of the rotor; determining the deflection of the rotor and/or a position error of the rotor in the set rotational position of the rotor from the relative position of the detection devices and the measurement body; and determining the force in the set rotational position of the rotor using a predetermined relationship between the force and the deflection and/or position error.

Abstract: Method for edge determination of a measurement object in optical metrology, comprising the steps of: capturing first image data of the measurement object under reflected-light illumination; capturing second image data of the measurement object under transmitted-light illumination; and determining a position of an edge of the measurement object based on an evaluation in which both the first and the second image data is used.

Abstract: Coordinate measuring machine, comprising an optical sensor for capturing image data of a workpiece. The optical sensor comprises a lens, which defines an optical axis, and an illumination device for illuminating the workpiece. The illumination device comprises a diffusely radiating luminous body and an optical filter having a plurality of separate light passages. Light emitted by the luminous body enters the filter on an underside thereof, passes through the light passages and emerges again from the filter on an opposite top side thereof. Each of the light passages transmits only light rays that form an angle smaller than a predefined limiting angle with a longitudinal axis of the respective light passage. The lens and the filter are inclined relative to one another in such a way that a normal vector aligned perpendicularly to the top side of the filter forms an inclination angle other than 0° with the optical axis.

Abstract: A measuring apparatus, in particular a coordinate measuring machine, comprising a first optical sensor for recording an image in an image capturing region during a first image recording time period, a first control signal transducer providing a first control signal representing the first image recording time period, a measurement illumination arrangement for illuminating the image capturing region, a second optical sensor for recording an image in the image capturing region during a second image recording time period outside of the first image recording time period, a second control signal transducer providing a second control signal representing the second image recording time period, and a control device for controlling the measurement illumination arrangement during the first image recording time period in a manner dependent on the first control signal and controlling the measurement illumination arrangement during the second image recording time period in a manner dependent on the second control signal.

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: A method is disclosed for ascertaining a focus image distance of an optical sensor, which is provided with a lens, of a coordinate-measuring apparatus onto a workpiece to be measured, wherein the optical sensor and/or the workpiece are movable in a Z direction such that a distance in the Z direction between the workpiece and the optical sensor is variable. Further, a corresponding coordinate-measuring apparatus and a computer program product are disclosed.

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 method and an apparatus for determining a plurality of spatial coordinates on a measurement object using a working head having an image sensor for recording images of the measurement object. A first image of a first feature of the object with the working head in a first working position is recorded. First spatial coordinates representing a spatial position of the first feature are determined using first position information of the working head supplied by an encoder arrangement. The working head is then moved relative to the object to a second working position, where a second image of the object is recorded. Using the first and the second images, second position information which represents a spatial offset of the working head relative to the object is determined. Spatial coordinates for a second feature of the measurement object are determined on the basis of the second position information.

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 performing measurements using a test element, comprising: arranging a test element in a measurement region of a coordinate-measuring apparatus, wherein the test element is arranged on a base of the coordinate-measuring apparatus or at/on a first, rotatable part of a rotating apparatus arranged within the measurement region, and wherein the test element is arranged in a first pose relative to the base or to the first part. performing a measurement by incorporating the test element in the first pose, arranging the test element with the movement device in a second pose on the base or on the first part using the movement device, performing a measurement by incorporating the test element in the second pose.

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 calibration pattern having a plurality of pattern regions for calibrating an imaging optical unit for metrological applications. At least one image of the calibration pattern is recorded using the imaging optical unit. The image is evaluated to quantify individual properties of the imaging optical unit. Depending on the quantified individual properties, correction values for a calculated correction of aberrations of the imaging optical unit are determined. The calibration pattern is provided on an electronic display having a plurality of display pixels arranged in the form of a matrix. In addition, a calibration body with at least one line having a defined dimension, is recorded using the imaging optical unit. A magnification factor of the imaging optical unit is determined on the basis of the at least one line. At least one further individual property of the imaging optical unit is quantified on the basis of the calibration pattern.

Abstract: A method and apparatus for reducing errors of a rotary device of a coordinate measuring machine or a machine tool. The rotary device comprises first and second parts rotatable relative to one another about an axis of rotation of the rotary device, and a rotational position measuring device for measuring rotational positions of the first part and the second part relative to one another. Errors of the rotary device due to deviations between actual positions and axial alignments relative to ideal positions and an ideal axial alignment are measured over a range of rotary angles. Expected variations in the position of the first part or second part resulting from a deviation of the rotational movement of the rotary device from an ideal rotational movement are established from the error measurements. Rotational position measurement locations of the rotational position measuring device are established in accordance with the expected variations.

Abstract: The invention relates to a method for reducing errors in a rotating device during the determination of coordinates of a workpiece or during the machining of a workpiece, the rotating device permitting rotational motion of the workpiece about a rotational axis of the rotating device during the determination of the co-ordinates or during the machining of the workpiece.

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 coordinate measuring machine has a rotary table supporting a measurement object, a measuring head including a measuring element and a frame, on which the measuring head is arranged. The frame has first, second and third frame parts moveable relative to the workpiece holder along first, second and third movement axes, respectively. The measuring element is mounted via at least one fluid bearing, such as an air bearing, on one or more of the frame parts. The measuring head is positioned at a defined position along the first, second and third movement axes. Thereafter, the at least one fluid bearing is deactivated and the rotary table rotated around a further axis while the measuring head, using the measuring element, records current measured values. A shape contour of the object is determined on the basis of the measured values recorded while the at least one fluid bearing was selectively deactivated.