Multi-material Acceptance Testing for CT-Based Coordinate Measurement Systems

2019 ◽  
pp. 131-154 ◽  
Author(s):  
Fabricio Borges de Oliveira ◽  
Markus Bartscher ◽  
Ulrich Neuschaefer-Rube ◽  
Rainer Tutsch ◽  
Jochen Hiller
Keyword(s):  
Acceptance Testing ◽  
Coordinate Measurement ◽  
Measurement Systems

scholarly journals Calibration and uncertainty estimation of non-contact coordinate measurement systems based on Kriging models

2019 ◽  
Vol 57 ◽  
pp. 16-29 ◽  
Author(s):  
Lan Fei ◽  
Jean-Yves Dantan ◽  
Cyrille Baudouin ◽  
Shichang Du
Keyword(s):  
Uncertainty Estimation ◽  
Coordinate Measurement ◽  
Measurement Systems

scholarly journals A Novel Measurement Standard for Surface Roughness on Involute Gears

2021 ◽  
Vol 11 (21) ◽  
pp. 10303
Author(s):  
Felix Steinmeyer ◽  
Dorothee Hüser ◽  
Rudolf Meeß ◽  
Martin Stein
Keyword(s):  
Surface Roughness ◽  
Physical Measurement ◽  
Roughness Measurement ◽  
Measurement Standard ◽  
Coordinate Measurement ◽  
Measurement Systems ◽  
Planar Surfaces ◽  
Involute Gears ◽  
Material Measure ◽  
Roughness Measurements

Although manufacturers of coordinate measurement systems and gear measurement systems already provide instruments that enable an end-of-line-monitoring of the roughness properties of gears, the roughness measurement on gear flanks still lacks traceability with respect to the standardised SI-units. There is still a gap between well standardised roughness measurements on planar surfaces and gear measurements on involutes. This gap is bridged by a novel physical measurement standard (PMS), also referred to as material measure, for roughness measurements on involute gears that has been developed at the Physikalisch-Technische Bundesanstalt (PTB). The necessary transformations between the systems of roughness and gear measurements have been implemented. The measurement standard itself represents calibrated roughness values for the parameters Ra, Rz, Rq, Rk, Rpk and Rvk and Mr1 and Mr2. Furthermore, the PMS can be measured both with classic profilometers as well as gear measurement systems with integrated roughness probes.

Relationship between Coordinate Transformation Uncertainty and Arrangement of Common Reference Points in Large-Scale Metrology

2017 ◽  
Vol 870 ◽  
pp. 309-314
Author(s):  
Jia Rui Lin ◽  
Yu Ren ◽  
Yin Guo ◽  
Yong Jie Ren ◽  
Ling Hui Yang ◽  
...  
Keyword(s):  
Coordinate Transformation ◽  
Large Scale ◽  
Transformation Process ◽  
Reference Points ◽  
Estimation Model ◽  
Individual Measurement ◽  
Coordinate Measurement ◽  
Measurement Systems ◽  
Common Reference ◽  
The Relationship

Large-scale coordinate measurement frequently involves unifying coordinate frames of individual measurement systems by aligning two sets of common reference points, which is called coordinate transformation. During this transformation process, some uncertainty is introduced into the final measurement results from common points. This paper studies the relationship between this introduced uncertainty and common points in order to minimize it. First, an uncertainty estimation model of coordinate transformation is developed to quantify the introduced uncertainty. Then the relationship between the introduced uncertainty and the arrangement of the common points is simulationally and experimentally investigated and some feasible and efficient arrangements are proposed in view of minimizing it.

Comparison of two calibration methods for a small industrial robot based on an optical CMM and a laser tracker

Robotica ◽  
2013 ◽  
Vol 32 (3) ◽  
pp. 447-466 ◽  
Author(s):  
Albert Nubiola ◽  
Mohamed Slamani ◽  
Ahmed Joubair ◽  
Ilian A. Bonev
Keyword(s):  
Industrial Robot ◽  
Laser Tracker ◽  
Calibration Model ◽  
Kinematic Calibration ◽  
Absolute Accuracy ◽  
Parameter Calibration ◽  
End Effector ◽  
Coordinate Measurement ◽  
Measurement Systems ◽  
Calibration Methods

SUMMARYThe absolute accuracy of a small industrial robot is improved using a 30-parameter calibration model. The error model takes into account a full kinematic calibration and five compliance parameters related to the stiffness in joints 2, 3, 4, 5, and 6. The linearization of the Jacobian is performed to iteratively find the modeled error parameters. Two coordinate measurement systems are used independently: a laser tracker and an optical CMM. An optimized end-effector is developed specifically for each measurement system. The robot is calibrated using fewer than 50 configurations and the calibration efficiency validated in 1000 configurations using either the laser tracker or the optical CMM. A telescopic ballbar is also used for validation. The results show that the optical CMM yields slightly better results, even when used with the simple triangular plate end-effector that was developed mainly for the laser tracker.

Overlap method for the performance evaluation of coordinate measurement systems and the calibration of one-dimensional artifacts

2020 ◽  
Vol 31 (5) ◽  
pp. 055006 ◽  
Author(s):  
Octavio Icasio-Hernández ◽  
Eugen Trapet ◽  
Edgar Arizmendi-Reyes ◽  
M Valenzuela-Galvan ◽  
A Brau-Avila
Keyword(s):  
Performance Evaluation ◽  
One Dimensional ◽  
Coordinate Measurement ◽  
Measurement Systems ◽  
Overlap Method

Camera calibration method used in computer vision coordinate measurement systems

2007 ◽  
Author(s):  
Zhijing Yu ◽  
Xinxin Li ◽  
Wei Tian ◽  
Miao Gong ◽  
Dongrui He ◽  
...  
Keyword(s):  
Computer Vision ◽  
Camera Calibration ◽  
Calibration Method ◽  
Coordinate Measurement ◽  
Measurement Systems
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