@article{47d79bba0a594d3dae46552596efc5e4,
title = "Systematic errors in Impact-Echo thickness estimation due to near field effects",
abstract = "Near field effects are found to create systematic errors, within the range of about 5-15%, in thickness estimations from Impact-Echo (IE) testing. This paper studies near field effects from a point source in a combined Multichannel Analysis of Surface Waves (MASW) and Impact-Echo analysis. The near field creates deviations in the measured velocity of the P-wave and the Rayleigh-wave, which lead to an underestimated thickness. This systematic error is identified in both a numerical and a real field case. The results are also compared with the conventional Impact-Echo method. (C) 2014 The Authors. Published by Elsevier Ltd.",
keywords = "Concrete, Impact-Echo, P-wave velocity, Thickness, Near field effect",
author = "Oskar Tofeldt and Nils Ryd{\'e}n",
year = "2015",
doi = "10.1016/j.ndteint.2014.09.003",
language = "English",
volume = "69",
pages = "16--27",
journal = "NDT & E International",
issn = "0963-8695",
publisher = "Elsevier",
}