Results 241 to 250 of about 1,468,079 (289)
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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.
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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.
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Optimization of laser trackers locations for position measurement
2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2018This 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 +3 more
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Surface metrology using laser trackers
SPIE Proceedings, 2005During the process of manufacture or measuring large components, position and orientation are needed thus; a method based in surveying the surface can be used to describe them. This method requires an ensemble of measurements of fixed points whose coordinates are unknown. Afterwards resulting observations are manipulated to determinate objects position
Rogerio Enriquez, Cesar E. Sampieri
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Uncertainty estimation for kinematic laser tracker measurements
2012 International Conference on Indoor Positioning and Indoor Navigation (IPIN), 2012Laser trackers are widely used to measure kinematic tasks such as tracking robot movements.
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Laser tracker position optimization
2014This article presents a laser tracker position optimization code based on the tracker uncertainty model developed by the National Physical Laboratory (NPL). The code is able to find the optimal tracker positions for generic measurements involving one or a network of many trackers, and an arbitrary set of targets.
Wang, Z, Forbes, A., Maropoulos, P. G.
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Automatic Eye Tracker for Excimer Laser Photorefractive Keratectomy
Journal of Refractive Surgery, 1995ABSTRACT Acute overlapping of successive laser pulses onto the cornea during photorefractive keratectomy (PRK) is important to avoid refractive distortions. Most excimer laser systems performing corneal ablation lack control of the patient's eye movements and they cannot track the target corneal zone. We developed an
P G, Gobbi +7 more
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Operational features of the Leica laser tracker
IEE Seminar Business Improvement Through Measurement, 1999Leica's laser tracker can follow a moving retro-reflector, measuring its 3D position 1000 times a second. This single sensor device can achieve accuracies of 10s of microns and has a maximum range of some 35 m. It is increasingly used in manufacturing industry as a flexible and accurate large scale coordinate measuring system, for example to inspect ...
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Dynamic performance evaluation of 6D laser tracker sensor
Proceedings of the 10th Performance Metrics for Intelligent Systems Workshop, 2010In this paper, several methods are presented for the evaluations of 6D sensor dynamic performances, including linear method and rotational method. These methods evaluate a sensor's translational and rotational characteristics under dynamic operations and have been successfully employed in the evaluations of the 3D and 6D sensor products of API.
Kam Lau +3 more
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Measurement of Aspherical Surfaces by Laser Tracker
ACTA PHOTONICA SINICA, 2012In order to test middle and low precision asphere and measurement of asphere during grinding and polishing,a new method by extending the ability of laser tracker is proposed.The testing principle is analyzed,and the testing procedure is devised.The coordinate of several points on the tested asphere can be measured by the laser tracker,and the figure ...
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