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Abstract - Application of guided waves for rail
inspection in railroad industry is considered in the
paper. They are particularly sensitive to vertical
defects and they are used at relatively low frequency
so they are not significantly attenuated by weld
material. Dispersion curves and mode shapes for
guided waves in rails were calculated using finite
element technique. For the experiments a mode that
only propagates in the web of the rail at frequency less
than 100 kHz was chosen. Novel transducers were
designed which produce in-plane displacements. For
damping of the transducers a specially designed
backing material composite was used in order to
reduce the ringing effect of the piezo element at low
frequencies. Experiments were conducted using a
single transducer and array of four transducers.
Different materials were evaluated for dry-coupling of
the transducers to the rail surface. The experimenta

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