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Crack detection limits in unit based masonry with terrestrial laser scanning

2013; Elsevier BV; Volume: 62; Linguagem: Inglês

10.1016/j.ndteint.2013.11.001

1879-1174

Debra F. Laefer, Linh Truong‐Hong, Hamish Carr, Manmeet Singh,

Remote Sensing and LiDAR Applications

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°–30°. 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.