Archives of Acoustics, 25, 2, pp. 213-227, 2000

Periodic crack-model of comb transducers: excitation of interface waves

E. DANICKI
Polish Academy of Sciences Institute of Fundamental Technological Research
Poland

A model for a comb transducer is proposed and analyzed. It is shown that interface waves are generated in the comb-sample contact area. The interface waves are leaky waves that transport acoustic energy along the interface towards the comb edges, where it is eventually converted into surface acoustic waves propagating outside the comb. By including piezoelectric effects in the comb and the sample materials, it is possible to analyze the incident bulk wave generated by embedded metal strips on both sides of the interface. Approximations for the scattered wavefield and the relationship describing the energy transfer along the interface are derived. Numerical examples are presented.
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References

D.C. Hurley, Nonlinear propagation of narrowband Rayleigh waves excited by a comb transducer, J. Acoust. Soc. Am. (in press).

E.J. Danicki and D.C. Hurley, Resonant scattering phenomenon by in-plane periodic cracks, J. Acoust. Soc. Am., 105, 1225 (1999), CD-ROM: Collected Papers “Berlin 99”, ISBN 3-9804568-5-4.

E.J. Danicki Resonant phenomena in bulk-wave scattering by in-plane periodic cracks, J. Acoust. Soc. Am., 105, 84–92 (1999).

E.J. Danicki, An approximation to the planar harmonic Green’s function at branch points in wave-number domain, J. Acoust. Soc. Am., 104, 651–663 (1998).

K. Bløtekjær, K.A. Ingebrigtsen and H. Skeie, A method for analyzing waves in structures consisting of metal strips on dispersive media, IEEE Trans. Electron Devices, 20, 1133–1138 (1973).

E. Danicki, Excitation, waveguiding and scattering of EM and elastic waves by a system of inplane strips or cracks, Arch. Mech., 46, 123–149 (1994).

E.I. Jury, Theory and application of the Z-transform method, Wiley, New York 1964.

E. Danicki, Spatial spectrum of electric charge on planar array of metal strips, Electr. Lett., 31, 2220–2221 (1995).

E. Danicki, Bending of a layered isotropic plate with periodic disbondings, ASME J. Appl. Mech., 61, 612–617 (1994).

J.L. Rose, S.P. Pelts and M.J. Quarry, A comb transducer model for guided wave NDE, Ultrasonics, 36, 163–169 (1998).

J.L. Rose and S.P. Pelts, A comb transducer model for guided wave mode control, Review of Progress in Quantitative Nondestructive Evaluation, 18, 1029–1037 (1999).