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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/).
BVID impact localisation on the SHM layer CFRP plate, baseline at 25 °C with compensated current signal. Temperature was varied between 31 and 38 °C when the signal was being acquired: (a) 50 kHz, four transducers; (b) 50 kHz, five transducers; (c) 300 kHz, four transducers.