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The setup of the sandwich Lamb wave device.
The experimental setup scheme for evanescent wave measurement.
Dispersion curve from FFT with the distance between two Lamb wave sensors of .
The amplitude and phase responses of the sandwich sensor variations showing distance changes. (a) is the amplitude variations with distance at C port; (b) is the phase variation with distance at C port; (c) is the amplitude variations at B port with distance; (d) is the phase variation at B port with distance.
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