Figure 5

Experimental measurements of the adaptive metamaterial response.

(a) Schematic of the experimental setup of the adaptive metamaterial enhanced sensing system. (b) Experimental and numerical characterizations of the transverse velocity fields along the waveguide at t = 2.98 ms. The solid and dashed curves represent the experimental data and numerical results, respectively. (c) Voltage gain spectra measured at the 4^th sensor. (d) Voltage gain spectra measured at the 7^th sensor. In (c,d) the circles denote the directly measured data, and the solid curves represent results from numerical simulations. (e,f) Wave velocity amplitude as a function of frequency and location along the waveguide with central frequency of the incident signal being 13.5 and 15.5 kHz, respectively.