Laser Scanning for Precise Ovalization Measurements: Standard Deviations and Smoothing Levels
| Autor: | Greta Deruyter, Hans De Backer, Timothy Nuttens, and Alain De Wulf, Ken Schotte, Philippe Van Bogaert, Cornelis Stal |
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| Rok vydání: | 2016 |
| Předmět: |
Engineering
Laser scanning business.industry 0211 other engineering and technologies Phase (waves) 020101 civil engineering 02 engineering and technology Radius Interval (mathematics) Laser Standard deviation 0201 civil engineering law.invention Optics law Measuring instrument business Smoothing 021101 geological & geomatics engineering Civil and Structural Engineering |
| Zdroj: | Journal of Surveying Engineering. 142 |
| ISSN: | 1943-5428 0733-9453 |
| DOI: | 10.1061/(asce)su.1943-5428.0000165 |
| Popis: | 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 thi... |
| Databáze: | OpenAIRE |
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