Abstract
Laser tracking system (LTS) has been widely used in energy industries to meet increasingly high accuracy requirements. However, its measuring accuracy is highly affected by the dynamic uncertainty errors of LTS, and also the current range and angle measurements of LTS are mainly weighted statically, obtaining the dynamic weighting model which is essential for LTS to improve the measuring accuracy. In this paper, a dynamic weighting model that describes not only the dynamic uncertainty but also the geometric variations of LTS is developed, which can be adjusted to the weighting factors of dynamic parameters according to the range observations relative to the angle observations. Intensive experimental studies are conducted to check validity of the theoretical results. The results show that the measuring accuracy of LTS has been increased 2 times after using this technique for correction.
Highlights
Conventional coordinate measuring machines (CMMs), as one of the powerful measuring instruments, have been widely used for dimensional and geometrical inspection in manufacturing industry for the past few decades
This paper developed a dynamic weighting model of laser tracking system (LTS), which can be adjusted to the weighting factors of dynamic parameters according to the range observations relative to the angle observations
The LTS measuring principle is based on a spherical coordinate system; it can be regarded as a portable frameless coordinate measuring machine
Summary
Conventional coordinate measuring machines (CMMs), as one of the powerful measuring instruments, have been widely used for dimensional and geometrical inspection in manufacturing industry for the past few decades. Among a broad range of large scale measuring systems, such as optical scanner, laser radar, indoor GPS, and digital photogrammetry, laser tracking system (LTS) has become the backbone for accurate dimensional measurement in many industrial and scientific fields due to its high accuracy, large measuring range, high sampling rate, and automatic target tracking It has been widely used in manufacturing measurement for dimension inspection, robot calibration, machine alignment, surface contour mapping, and reverse engineering [1,2,3,4,5,6,7]. In order to improve the LTS measuring accuracy and reduce the uncertainty sources, Umetsu et al [8] proposed a novel method for error analysis and self-calibration of laser tracking mirror mechanism in LTS and developed a kinematics model of geometric variations for LTS. The technique can be used to perform error correction for LTS and to determine all parameters of the dynamic weighting model
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