Results 241 to 250 of about 1,533,904 (293)
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Advanced Solid State Lasers, 1997
A high brightness diode-pumped, Nd-YAG solid state laser has been designed, fabricated, and tested. This phase conjugated master oscillator/power amplifier (MOPA) device produces 20-ns Q-switched pulses at 2500 Hz at an average power of 690 W and a beam quality of 1.1/spl times/DL when the pump diodes are operated at 27.5% duty cycle.
R.J. St. Pierre +13 more
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A high brightness diode-pumped, Nd-YAG solid state laser has been designed, fabricated, and tested. This phase conjugated master oscillator/power amplifier (MOPA) device produces 20-ns Q-switched pulses at 2500 Hz at an average power of 690 W and a beam quality of 1.1/spl times/DL when the pump diodes are operated at 27.5% duty cycle.
R.J. St. Pierre +13 more
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Performance evaluation of laser trackers
Proceedings of the 8th Workshop on Performance Metrics for Intelligent Systems, 2008The American Society for Mechanical Engineers (ASME) recently released the ASME B89.4.19 Standard [1] on performance evaluation of spherical coordinate instruments such as laser trackers. At the National Institute of Standards and Technology (NIST), we can perform the complete set of tests described in the Standard, and have done so for a variety of ...
B. Muralikrishnan +5 more
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Restriction on the arrangement of laser trackers in laser trilateration
Measurement Science and Technology, 1998Laser 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 +3 more
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Dynamic testing of laser trackers
CIRP Annals, 2015Abstract 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
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Iterative learning‐based laser beam tracker
Industrial Robot: An International Journal, 2007PurposeThe 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 +2 more
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Optical design of a laser tracker
Infrared and Laser Engineering, 2020In order to improve the search range and imaging resolution of the ground target by the laser tracker, a method of searching and tracking the target with a common aperture laser tracker under an airborne platform was presented and the optical system was designed.
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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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