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. 2012 May 7;12(5):5835–5849. doi: 10.3390/s120505835

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© 2012 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 7. — Signal-to-noise ratio (SNR) of signals detected by FBG accelerometer, Z-axis of geophone, and microphone. The upper subplot was the ground vibration signal detected by FBG accelerometer.