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Extended synthetic aperture focusing technique for ultrasonic imaging of concrete
Affiliation:1. CEA, LIST, Gif-sur-Yvette F-91191, France;2. Institut Langevin, 1 rue Jussieu, 75238 Paris Cedex 05, France;1. Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 7371, INSERM UMR S 1146, Laboratoire d’Imagerie Biomédicale, Paris, France;2. EDF R&D, Site des Renardière, Avenue des Renardières-Ecuelles Moret sur Loing, France;1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, PR China;2. Ocean Engineering Joint Research Center of DUT-UWA, Dalian 116024, PR China;3. Department of Mechanical, Aerospace and Civil Engineering, Brunel University London, Uxbridge, Middlesex UB8 3PH, United Kingdom;1. The Phased Array Company, 9 rue du marché commun, 44333 Nantes, France;2. The Phased Array Company, 9078 Union Centre Blvd., Suite 350, West Chester, Ohio 45069, USA;1. Department of Civil, Environmental, and Construction Engineering, Texas Tech University, Lubbock, TX 79409, United States;2. Department of Civil Engineering, Halla University, Won-Ju, South Korea;3. Department of Civil Engineering, Kangwon National University, Chun-Cheon, South Korea;1. Siemens Corporation, Corporate Technology, 755 College Rd. E., Princeton, NJ 08540, USA;2. School of Reliability and System Engineering, Beihang University, 37 Xueyuan Rd., Beijing 100191, China;3. Siemens Energy, Inc., 841 Old Frankstown Road, Pittsburgh, PA 15239, USA
Abstract:Quantitative nondestructive characterization of defects and inclusions in portland cement concrete structures are realized in this paper via extended reconstructions for linear array ultrasound systems. This is accomplished through generalization of traditional Kirchhoff-based synthetic aperture focusing technique migration to mitigate the effects of limited aperture and handle multiple scans as a single virtual array with increased effective aperture. Pearson’s correlation is utilized to account for uncertainty in relative position of individual measurement and mitigate the need for robotic precision when placing adjacent scans. The robustness of the method is demonstrated on artificially generated data as well as in-situ measurements for assessment of internal portland cement concrete characteristics such as inclusions and cracks.
Keywords:Concrete  Ultrasound  Array  SAFT  Imaging
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