Three-Dimensional Network Adjustment of Laser Tracker Measurements for Large-Scale Metrology Applications
Publication: Journal of Surveying Engineering
Volume 147, Issue 1
Abstract
The adjustment of laser tracker network measurements for large-scale metrology applications has unique considerations not commonly encountered in the network adjustment approaches generally used in either standard metrology or in traditional geodetic surveying. Many applications that require the measurement accuracy of a laser tracker are confined to small working areas to measure the dimensional quality of manufactured parts. Large-scale metrology applications require the same high measurement accuracy, but over a comparatively larger working area. This paper describes a unified least-squares approach to adjust three-dimensional survey network measurements that takes into account the unique considerations of large-scale metrology networks. The impetus for these unique considerations arises from an application that falls neatly between the disciplines of metrology and geodesy—resembling a mixture of the conditions and requirements from both. This paper will also describe a case study of a large-scale metrology survey network used to align the particle accelerator at Michigan State University’s Facility for Rare Isotope Beams (FRIB).
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. This includes the raw network measurement data from each of the four tunnel network measurement campaigns. The NETOBS software written at FRIB to interface with Leica AT40x laser trackers and perform least-squares network adjustment analysis is published on FRIB’s website: https://frib.msu.edu/users/netobs.html.
Acknowledgments
This material is based on work supported by the US Department of Energy (DOE) Office of Science under Cooperative Agreement DE-SC0000661, the State of Michigan, and Michigan State University. Michigan State University designs and establishes FRIB as a DOE Office of Science National User Facility in support of the mission of the Office of Nuclear Physics. The author would like to thank Dr. James Bethel and Catherine LeCocq for helpful comments during the writing of this paper. Also, thanks to Doug Bruce for bringing my attention to a unique and more accurate stochastic model for weighting azimuth angles. Finally, thanks to the reviewers who provided detailed comments to improve the content of this paper.
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Published In
Journal of Surveying Engineering
Volume 147 • Issue 1 • February 2021
Copyright
© 2020 Published by American Society of Civil Engineers.
History
Received: Feb 20, 2020
Accepted: Jun 9, 2020
Published online: Sep 26, 2020
Published in print: Feb 1, 2021
Discussion open until: Feb 26, 2021
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