Laser Scanning for Precise Ovalization Measurements: Standard Deviations and Smoothing Levels
Publication: Journal of Surveying Engineering
Volume 142, Issue 4
Abstract
Monitoring of measurements needs to be supported by a thorough knowledge of the achievable accuracy of the measurement equipment and the processing methodology. This study on ovalization monitoring with laser scanning in tunnels under construction focused on fast-performing laser scanners and their achievable accuracy. This research also investigated the optimum smoothing level of the laser scanning data to achieve the best estimates of ovalization. The experimentally based standard deviations indicate that the used phase-based laser scanner delivers highly accurate results with standard deviations between 0.34 and 0.58 mm, depending on the applied smoothing level. In this research, this laser scanner was used, together with a [x – 0.008 rad; x + 0.008 rad] smoothing interval on the calculated radius values to meet the accuracy requirement requested by the client (0.5 mm), even when using multiple setups. Another used type of laser scanner (pulse-based) also delivers standard deviations around this range, but this instrument has a lower scanning speed and a smaller vertical field of view, making it less adapted for measurements in time-restricted tunnel-monitoring projects.
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Published In
Journal of Surveying Engineering
Volume 142 • Issue 4 • November 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Aug 12, 2013
Accepted: Oct 14, 2015
Published online: Feb 3, 2016
Discussion open until: Jul 3, 2016
Published in print: Nov 1, 2016
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