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. 2019 Jan 18;19(2):383. doi: 10.3390/s19020383

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Schematic diagram of the sensing locations; (b) incident and reflected Lamb waves from pristine stiffener; (c) transmitted Lamb waves from the pristine stiffener; (d) incident and reflected Lamb waves from cracked stiffener; (e) transmitted Lamb waves from cracked stiffener.

(a) Schematic diagram of the sensing locations; (b) incident and reflected Lamb waves from pristine stiffener; (c) transmitted Lamb waves from the pristine stiffener; (d) incident and reflected Lamb waves from cracked stiffener; (e) transmitted Lamb waves from cracked stiffener.