Now showing items 1-6 of 6

    • Generation of focused surface waves with a solid wedge 

      Atalar, Abdullah; Koymen, H. (IEEE, 1987-10)
      Focusing of surface acoustic waves on material surfaces was achieved by axicons in liquid immersion. The system consisted of a plane acoustic wave generator obliquely insonifying a cylindrical mirror placed perpendicularly ...
    • A Lamb Wave Lens for Acoustic Microscopy 

      Atalar, Abdullah; Koymen H.; Degertekin F.L. (1992)
      In a conventional scanning acoustic microscope the excited leaky modes contributes significantly to the high contrast obtained in the images. However, all such modes exist simultaneously, and the interpretation of the ...
    • Location and curvature estimation of spherical targets using multiple sonar time-of-flight measurements 

      Barshan, B. (Institute of Electrical and Electronics Engineers, 1999-12)
      A novel, flexible, three-dimensional multisensor sonar system is described to localize the center of a generalized spherical target and estimate its radius of curvature. Point, line, and planar targets are included as ...
    • Response of acoustic imaging systems using convergent leaky waves to cylindrical flaws 

      Gonalp, N.; Atalar, Abdullah (IEEE, 1989)
      Characterization of near-surface properties of materials by acoustic means is most convenienth done by surface-acoustic-waves (SAW) that are spatially confined to the surface. There are several techniques available to ...
    • Response of surface acoustic wave imaging systems to cylindrical inhomogeneities 

      Gunalp, N.; Baygun, B.; Surucu, F.; Atalar, Abdullah (IEEE, 1988-10)
      The authors present a theory to predict the response of a SAW (surface acoustic wave) imaging system. In particular, they calculate the response to cylindrical cavities as a function of cavity position with respect to the ...
    • Synthetic aperture imaging system using surface wave modes 

      Bozkurt, A.; Arikan, O.; Atalar, Abdullah (IEEE, 1995)
      A synthetic aperture acoustic imaging system with a novel inversion algorithm is described. Data is obtained by using a transducer insonifying the sample surface at a critical angle which is excited by a short electrical ...