Journal
NDT & E INTERNATIONAL
Volume 62, Issue -, Pages 66-76Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2013.11.001
Keywords
Terrestrial laser scanning; Point cloud data; Crack detection; Structural health monitoring; Condition assessment; Masonry
Funding
- Science Foundation Ireland [05/PICA/I830]
- European Union's ERC-2012-StG_20111012 Project [307836]
- Science Foundation Ireland (SFI) [05/PICA/I830] Funding Source: Science Foundation Ireland (SFI)
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This paper presents the fundamental mathematics to determine the minimum crack width detectable with a terrestrial laser scanner in unit-based masonry. Orthogonal offset, interval scan angle, crack orientation, and crack depth are the main parameters. The theoretical work is benchmarked against laboratory tests using 4 samples with predesigned crack widths of 1-7 mm scanned at orthogonal distances of 5.0-12.5 m and at angles of 0 degrees-30 degrees. Results showed that absolute errors of crack width were mostly less than 1.37 mm when the orthogonal distance varied 5.0-7.5 m but significantly increased for greater distances. The orthogonal distance had a disproportionately negative effect compared to the scan angle. (C) 2013 Elsevier Ltd. All rights reserved.
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