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. 2016 Mar 5;16(3):337. doi: 10.3390/s16030337

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© 2016 by the authors; licensee MDPI, Basel, Switzerland.

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

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Waveforms collected at the third sensor (S3) and fourth sensor (S4) (a) vertical (90°) surface breaking crack and (b) inclined (150°) surface breaking crack for 30 kHz excitations.

Waveforms collected at the third sensor (S3) and fourth sensor (S4) (a) vertical (90°) surface breaking crack and (b) inclined (150°) surface breaking crack for 30 kHz excitations.