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Sensors 2017, 17(5), 1085;

Ultrasound Transmission Tomography for Detecting and Measuring Cylindrical Objects Embedded in Concrete

Instituto de Tecnologías Físicas y de la Información, ITEFI (CSIC), C/Serrano 144, 28006 Madrid, Spain
Innerspec Technologies Europe, Av. Madrid km. 27.2, 28802 Alcalá de Henares, Spain
E.T.S.I. Telecomunicación, U.P.M. Av. Complutense 30, 28040 Madrid, Spain
Author to whom correspondence should be addressed.
Academic Editor: Xiaoning Jiang
Received: 2 March 2017 / Revised: 7 April 2017 / Accepted: 6 May 2017 / Published: 10 May 2017
(This article belongs to the Section Physical Sensors)
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This study explores the feasibility of using transmission tomographic images based on attenuation measures in transmission to detect and estimate the most common materials that are embedded in concrete, reinforcements and natural and artificial voids. A limited set of concrete specimens have been made in which cylindrical objects such as bars/tubes of steel, PVC and aluminium have been embedded to analyse the effect of size and material. The methodology and scope of this study is presented and numerical simulations are carried out to optimize the emitter-receiver configuration and to understand the complex physical propagation phenomena of ultrasonic signals that travel through concrete with embedded inclusions. Experimental tomographic images are obtained by using an ultrasonic tomographic system, which has the advantage of needing only two ultrasonic transducers. Both the software simulation tool and the tomographic inspection system are developed by the authors. The obtained results show that PVC tubes and steel bars of diameters higher than 19 mm and embedded in cylindrical specimens, can be detected and their sizes estimated using segmented tomographic images. View Full-Text
Keywords: ultrasound; tomography; concrete; inspection system ultrasound; tomography; concrete; inspection system

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Lluveras Núñez, D.; Molero-Armenta, M.Á.; Izquierdo, M.Á.G.; Hernández, M.G.; Anaya Velayos, J.J. Ultrasound Transmission Tomography for Detecting and Measuring Cylindrical Objects Embedded in Concrete. Sensors 2017, 17, 1085.

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