Results 181 to 190 of about 3,631,896 (245)

Dynamic testing of laser trackers

CIRP Annals, 2015
Abstract Laser trackers measure and report the three-dimensional location of a retroreflector target in space. Inaccuracies in the rotary encoders that measure angle, the ranging system, or in the geometric relationship between the axes will produce errors in the location determination.
Edward Morse, Victoria Welty
openaire   +1 more source

Restriction on the arrangement of laser trackers in laser trilateration

Measurement Science and Technology, 1998
Laser trilateration is an effective technique for measuring three-dimensional coordinates. Taking advantage of a fourth laser tracker, the positions of all four laser trackers can be determined by a self-calibration algorithm. We show a restriction on the arrangement of laser trackers, namely, no tracker must exist on the plane defined by the other ...
Toshiyuki Takatsuji, Yoshihiko Koseki, Mitsuo Goto, Tomizo Kurosawa   +3 more
openaire   +1 more source

Integration and optical alignment of the Rubin Observatory Simonyi Survey Telescope with a laser tracker

Astronomical Telescopes + Instrumentation
Precision in optical alignment is crucial for optimizing image quality in astronomical telescopes, particularly for wide-field survey telescopes such as the Vera C. Rubin Observatory, which will conduct the Legacy Survey of Space and Time (LSST).
Guillem Megias Homar, R. Tighe, S. Thomas, Scott Sandwith, J. Sebag, B. Stalder, Mario Rivera, Tiago Ribeiro, John Palmateer, Joshua M. Meyers, Dave Mills, S. M. Kahn, Freddy Muñoz, Juan López, Claudio Araya, Christian Aguilar   +15 more
semanticscholar   +1 more source

Accuracy improvement of laser tracker registration based on enhanced reference system points weighting self-calibration and thermal compensation.

Review of Scientific Instruments
Improving the accuracy of large measurement systems consisting of multiple laser trackers and Enhanced Reference System (ERS) points is technically challenging.
Shoudong Ma, Yong Lu, Kenan Deng, Zhihang Wu, Xu Xu   +4 more
semanticscholar   +1 more source

Iterative learning‐based laser beam tracker

Industrial Robot: An International Journal, 2007
PurposeThe purpose of this paper is to describe development and application of an iterative learning control (ILC) scheme for a tracking problem. The control objective is to achieve accurate tracking of a desired trajectory which is the path taken by a laser beam.Design/methodology/approachIt involves formulating an ILC scheme in two‐dimensional (2D ...
Suhail Ashraf, Robert M. Parkin, Ejaz Muhammad   +2 more
openaire   +1 more source

The automatic laser tracker

IEEE Journal of Quantum Electronics, 1967
Missile and aircraft testing facilities have always relied on manually operated tracking cameras to obtain close-up photographic coverage of test runs. As long as the apparent target motion is less than about 60 degrees per second, an experienced operator can follow the target reasonably well.
openaire   +1 more source

Optimization of laser trackers locations for position measurement

2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2018
This paper presents an approach optimizing the location of laser tracker system to improve the accuracy of position measurement for heavy-duty machine tools. The approach is based on a physical model of the realistic structure of the whole working space with considering constraints determined by the structure of heavy-duty machine tools.
Han Wang 0001, Zhongxi Shao, Zhaoyan Fan, Zhenyu Han   +3 more
openaire   +1 more source

LSFP-Tracker: An Autonomous Laser Stripe Feature Point Extraction Algorithm Based on Siamese Network for Robotic Welding Seam Tracking

IEEE transactions on industrial electronics (1982. Print)
Laser vision-based welding seam tracking has become the key technology to realize intelligent robotic welding, and extracting the feature point of welding seam is an essential step.
Runquan Xiao, Yanling Xu, Fengjing Xu, Zhen Hou, Huajun Zhang, S. Chen   +5 more
semanticscholar   +1 more source

Configuration optimization of laser tracker stations for position measurement in error identification of heavy-duty machine tools

Measurement science and technology, 2019
Location configurations greatly affect the accuracy of sequential multilateration measurements using a laser tracker. This paper presents an approach that optimizes the locations of a laser tracker to improve the accuracy of position measurement in ...
Han Wang, Zhongxi Shao, Zhaoyan Fan, Zhenyu Han   +3 more
semanticscholar   +1 more source

Working pose measurement and quality evaluation of rotary drilling rig based on laser tracker

Optik (Stuttgart), 2019
Rotary drilling rig is a large-scale construction machinery. It is of great significance to detect the on-line state of the drilling stem, especially the drilling pose. Optical pose measurement is a novel and effective solution for such large machine. In
Xinghua Lu, Tao Jiang
semanticscholar   +1 more source