Systematic errors in Impact-Echo thickness estimation due to near field effects
| Autor: | Nils Ryden, Oskar Tofeldt |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Systematic error
P-wave velocity business.industry Point source Mechanical Engineering Echo (computing) Impact-Echo Near and far field Condensed Matter Physics Computational physics Near field effect Optics Materials Science(all) Surface wave Range (statistics) General Materials Science business Thickness Geology Real field Concrete |
| Zdroj: | NDT & E International. 69:16-27 |
| ISSN: | 0963-8695 |
| DOI: | 10.1016/j.ndteint.2014.09.003 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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