A method which permits a rapid determination of the resonance spectrum of submerged elastic cylindrical wires is described. A portion of the backscattering signal is selected by a gate, and the gated echo is Fourier-transformed into the frequency domain. Depending on the temporal position of the gate in comparison with the specular signal, either the form function (gate includes the rigid contribution) or the resonance spectrum (gate excludes the specular echo) was determined. According to the attenuation properties of the surface waves in cylindrical targets, the first (n, 1), or Rayleigh, resonances can be separated from the (n, l=2,3,...) resonances corresponding to the Whispering Gallery waves. The use of a broadband transducer is necessary in order to achieve a clear separation of specular and circumferential wave echoes.
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M. de Billy (1986) studied this question.