Crack detection limits in unit based masonry with terrestrial laser scanning

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

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Pages (from-to)66-76
Number of pages11
JournalNDT and E International
StatePublished - Mar 2014


  • Condition assessment
  • Crack detection
  • Masonry
  • Point cloud data
  • Structural health monitoring
  • Terrestrial laser scanning

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering


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