Structures of EMATs for generating the guided waves: (a) SH waves and (b) Lamb waves.
Dispersion curves of SH waves in a steel plate. The rectangle boxes indicate the operating zones.
Schematic diagram of the excitation of SH waves in a plate.
Schematic diagram of the excitation of SH waves at operating point O1 on the dispersion curve.
The relationship between (a) wavelength-frequency curve and (b) time-frequency curve of SH waves.
The detected waveforms at fourteen operating points.
Time-frequency analysis of points M and N, and the 2nd, 8th, and 13th of the fourteen waveforms. (a) The excitation frequency f EMAT of the tone burst signals and (b) the frequency f GW of the detected wave signals.
Experimental results of the relationship between α, f GW, f EMAT, measurements errors, and the amplitude voltage of detected wave signals. (a) f-α curves. (b) α-error and α- amplitude curves.
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