An error identification method includes a tool sensor position acquisition stage, a reference block position acquisition stage, a relative position calculation stage, a reference tool position acquisition stage, a position measurement sensor measurement stage, a length compensation value calculation stage, a diameter compensation value acquisition stage, a position measurement stage, a position compensation stage, and a geometric error identification stage. The diameter compensation value acquisition stage acquires a radial direction compensation value of the position measurement sensor with the measured jig. The position measurement stage indexes the rotation axis to a plurality of any given angles and measures respective positions of the measured jig. The position compensation stage compensates the position measurement value at the position measurement stage using the length direction compensation value and the radial direction compensation value. The geometric error identification stage identifies the geometric error from the plurality of position measurement values.

A rotation angle detector has a rotation angle sensor and a microcomputer, where the sensor detects a change of a magnetic field of a magnet that rotates with a shaft. The microcomputer has a first corrector for correcting a pre-correction mechanical angle, based on a first correction value that corrects an error due to an assembly process for assembling the magnet and the sensor, and a second corrector for correcting the pre-correction mechanical angle based on a second correction value that corrects an error due to a spill magnetic flux that is generated by a supply of an electric current to a winding wire. In such configuration, the rotation angle detector may correct the error due to the spill magnetic flux, thereby enabling an accurate detection of a mechanical angle.

A Coordinate Measuring Machine (CMM) system comprising a CMM, a rotary table, and a rotation arrangement, wherein the CMM system is configured to be calibrated by determining the 6 dof pose of a jig, and to a method for calibrating. The jig may be mounted such that a current pose of the jig is associated with a current pose of the rotary table with respect to the CMM. The rotary table may be moved into multiple poses, and the 6 dof pose of the jig is measured for each of the multiple poses of the rotary table. An error map is generated, based on the angles associated with the poses of the rotary table, and is used to generate a coordinate transformation from the CMM coordinate system to the part coordinate system, which is associated with the rotary table, based on the error map.

A method for monitoring a coordinate-measuring machine (CMM), having a monitoring device which is set up to monitor at least one location region of the CMM, in which a movable part of the CMM is movable, wherein the method includes: monitoring the at least one location region with the monitoring device, wherein the monitored location region is variable in terms of its size, ascertaining the position of the movable part of the CMM relative to a fixed position associated with the location region and/or ascertaining the movement of the movable part relative to the fixed position, and
setting or varying the size of the monitored location region in dependence on the position and/or the movement of the movable part relative to the fixed position.

Described herein is a method of setting-up a range-based tracking system utilising a tracking coordinate system that uses a plurality of spaced apart stationary nodes for tracking objects within a tracking environment. The method includes the step of transmitting signals between the stationary nodes to obtain range information between at least a subset of pairs of the nodes and determining coordinates for all of the stationary nodes in a node coordinate system using these range information. The method also includes the step of obtaining spatial information related to at least one of the nodes, the spatial information being indicative of one or more features or locations within the tracking environment and determining the location of all stationary nodes in the tracking coordinate system, wherein some or all of the coordinates of the stationary nodes are used for tracking objects in the tracking system.

There is described herein a method and system for inspecting various fabrication features of composite components, such as tow/ply location, angle deviation, and gap size, using a laser-vision assembly. In some embodiments, a tolerance for that fabrication feature is provided as an inspection feature and a laser projecting device projects the inspection feature onto the material. Alternatively or in combination thereof, a calibration feature is projected onto the material, the calibration feature comprising known dimensional information. An image acquisition device acquires an image of the material with the inspection/calibration feature(s) projected thereon. The images can be analysed automatically or manually to detect whether the fabrication features are compliant and/or to obtain measurement data of the fabrication features.

For position sensors, e.g., a fiber-based system, that build a shape of an elongated member, such as a catheter, using a sequence of small orientation measurements, a small error in orientation at the proximal end of the sensor will cause large error in position at distal points on the fiber. Exemplary methods and systems are disclosed, which may provide full or partial registration along the length of the sensor to reduce the influence of the measurement error. Additional examples are directed to applying selective filtering at a proximal end of the elongated member to provide a more stable base for distal measurements and thereby reducing the influence of measurement errors.

A first correction component calculation processing unit calculates diagonal components of a correction matrix based on first and second detection values. The first and second detection values are obtained by measurement in which a calibration reference body and the probe are moved relatively to each other in a normal direction on a surface of the calibration reference body so as to bring a measurement tip into contact with the surface of the calibration reference body at one point. A second correction component calculation processing unit calculates non-diagonal components of the correction matrix based on third and fourth detection values. The third and fourth detection values are obtained by scanning measurement using the measurement tip on the surface of the calibration reference body while maintaining a constant relative distance between the center of the measurement tip and a reference point or a reference line of the calibration reference body.

A method and apparatus for correcting errors in a bearing cartridge used in a portable articulated arm coordinate measurement machine (AACMM) is provided. The method includes providing a cartridge having a first bearing and a second bearing arranged in a fixed relationship to define an axis, the cartridge further including an angle measurement device configured to measure a rotation of a portion of the cartridge about the axis. A plurality of angles is measured with the angle measurement device. A first plurality of displacements is determined at a first position along the axis, each of the first plurality of displacements being associated with one of the plurality of angles. Compensation values are determined based at least in part on the plurality of angles and the first plurality of displacements.

The invention relates to an arrangement for contactless determination of at least one dimension of a moving material web, in particular a material web of opaque material, with a background illumination, with optical detection means for detecting at least one current contrast image and with evaluation means, wherein the background illumination is arranged opposite the optical detection means, wherein the material web moves in a plane between the at least one optical detection means and the background illumination, and wherein the current contrast image has at least one piece of information about at least one light intensity laterally adjacent to the material web. Furthermore, the present invention concerns a corresponding process. For simplifying and improving the non-contact determination of the dimension, the present invention proposes to provide a shadowing element and to compare the current contrast image with a reference contrast image, wherein the current contrast image represents a shadowing of the background illumination by the material web and by the shadowing element.