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. 2013 Sep 9;13(9):11998–12011. doi: 10.3390/s130911998

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© 2013 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 license (http://creativecommons.org/licenses/by/3.0/).

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Figure 11. — Strain value graph recorded at 100 Hz by means of the MicronOptics interrogator (a) and data for a same location and energy impact obtained with a 20 KHz interrogator (b). In red there is a sinusoidal pattern of 7 Hz to serve as a help when identifying the fundamental frequency of the studied signal.