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- W251220002 abstract "Experimental and numerical investigations have been performed to assess the feasibility of damage detection around rebars in concrete using focused ultrasound and a Reverse Time Migration (RTM) based subsurface imaging algorithm. Since concrete is heterogeneous, an unfocused ultrasonic field will be randomly scattered by the aggregates, thereby masking information about damage(s). A focused ultrasonic field, on the other hand, increases the possibility of detection of an anomaly due to enhanced amplitude of the incident field in the focal region. Further, the RTM based reconstruction using scattered focused field data is capable of creating clear images of the inspected region of interest. Since scattering of a focused field by a damaged rebar differs qualitatively from that of an undamaged rebar, distinct images of damaged and undamaged situations are obtained in the RTM generated images. This is demonstrated with both numerical and experimental investigations. The total scattered field, acquired on the surface of the concrete medium, is used as input for the RTM algorithm to generate the subsurface image that helps to identify the damage. The proposed technique, therefore, has some advantage since knowledge about the undamaged scenario for the concrete medium is not necessary to assess its integrity." @default.
- W251220002 created "2016-06-24" @default.
- W251220002 creator A5009821855 @default.
- W251220002 creator A5075191184 @default.
- W251220002 date "2015-09-01" @default.
- W251220002 modified "2023-10-09" @default.
- W251220002 title "Defect detection around rebars in concrete using focused ultrasound and reverse time migration" @default.
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- W251220002 doi "https://doi.org/10.1016/j.ultras.2015.05.008" @default.
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