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. 2017 Mar 22;17(3):660. doi: 10.3390/s17030660

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© 2017 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) Comparison PZT-Transfer function within Sweep and Chirp; and (b) detailed Time–Frequency representation of the peak hold method analysis for the sweep excitation.