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• W2041602128 abstract "Detection of subsurface defects (e.g., delamination, cracking) using microwave/radar sensors (e.g., ground penetratingradar or GPR) is an important and promising technique for the effective and efficient maintenance of civilinfrastructure. In this technique, reflected and scattered electromagnetic signals are typically collected and usedfor interpreting the size and property of subsurface damages. The objective of this paper is to investigate the feasibilityof using finite measurements in the reflected signal for size estimation, through the geometric analysis ofwaveform. Simulated transient electromagnetic response was generated by finite difference time domain (FDTD)methods in two dimensional domain. A modulated Gaussian impulse at a center frequency of 3.5 GHz was usedas the source. Rectangular delaminations with a width ranging from 3.048 cm to 16.256 cm and a thickness of0.762 cm were considered. The depth of subsurface delamination was also studied. The curvature of reflectedwaveforms, obtained by three measurements, was used to correlate with the width of subsurface delamination. Arelative width parameter was defined and used in the proposed equations for estimating the delamination widthwith less than 10% error. It is found that the relative width parameter is linearly proportional to the difference inwaveform curvature. The proposed approach is potentially applicable to other subsurface defects with differentshapes." @default.
• W2041602128 created "2016-06-24" @default.
• W2041602128 creator A5045315152 @default.
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• W2041602128 date "2011-03-24" @default.
• W2041602128 modified "2023-09-23" @default.
• W2041602128 title "Geometric analysis for the size estimation of subsurface delamination in transient electromagnetic response" @default.
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• W2041602128 doi "https://doi.org/10.1117/12.880558" @default.
• W2041602128 hasPublicationYear "2011" @default.
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