Interface Wave Source Concepts for a Seismo-Acoustic Sonar
Gaghan, Frederick E.
Baker, Steven R.
Muir, Thomas G.
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A seismo-acoustic sonar concept is being developed which uses guided interface (Rayleigh or Scholte) waves to detect naval md land mines buried in beach or sea floor sediments. The characteristics exhibited by these waves which make them suitable for such an application are that ( I) they are the most significant disturbance along a boundary, being localized within a layer proportional to the wavelength, and (2) the propagation horn a compact source is cylindrical. As a result, the wave intensity on targets of interest is enhanced and the reverberation is suppressed, compared to a bulk wave. To selectively excite Rayleigh or Scholte waves, a harmonic source employed at the interface must excite elliptical particle motion in a vertical plane containing the direction of propagation. Several source concepts are being investigated. The results to date of field tests will be described.