Bioinspired Low-Frequency Material Characterisation

<table class="table-group" width="800px"><tr class="fig-image" id="a"><td><img alt="927903.fig.007a" src="https://static.hindawi.com/articles/aav/volume-2012/927903/figures/927903.fig.007a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b>transmission</td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="927903.fig.007b" src="https://static.hindawi.com/articles/aav/volume-2012/927903/figures/927903.fig.007b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>pulse echo</td></tr></table></td></tr></table>

<table>Experimental (black diamonds) and modelled (grey lines) spectra for polypropylene (PP) targets of various thicknesses, obtained using the linear frequency modulated (LFM) chirp; traces are offset by the values shown in brackets.</table>

Advances in Acoustics and Vibration

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Figure 7

Figure 7: Bioinspired Low-Frequency Material Characterisation 