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The paper reports about the development of an automatic tool that can be used to measure the depth of cracks with millimetric precision on board of a structural inspection robot. The system is based on two piezoelectric ultrasonic transducers with central frequency of 50 kHz that are utilized to take Time-of-Flight (ToF) ultrasound measurements across the crack to determine its depth. In order to cope with the intrinsic inhomogeneity of concrete, the measurement method adopted in the automatic system is based on the simultaneous determination of ultrasound speed propagation and crack depth in one measurement series over the crack. To this purpose, the automatic system is designed to be able to position the two transducers in the required way on a concrete surface by using two stepper positioning systems mounted at 90° with respect to each other, able to displace the sensors with millimetric precision over …
ICE Publishing
Publication date: 
1 Jan 2016

L Belsito, L Masini, M Sanmartin, K Loupos, A Roncaglia

Biblio References: 
Pages: 239-244
Transforming the Future of Infrastructure through Smarter Information: Proceedings of the International Conference on Smart Infrastructure and ConstructionConstruction, 27–29 June 2016