Now showing items 1-5 of 5

    • Anisotropy sensitivity of an acoustic lens with slit aperture 

      Atalar, Abdullah; Ishikawa, I.; Ogura, Y.; Tomita, K. (IEEE, 1993)
      A conventional spherical acoustic lens is modified by restricting its aperture in the form of a slit to provide directional sensitivity. The spacing between the two parallel absorbing sheets forming the slit is adjustable ...
    • Comparison of the CAF-DF and sage algorithms in multipath channel parameter estimation 

      Güldoğan, M. Burak; Arıkan, Orhan (IEEE, 2008-07)
      In this paper, performance of the recently proposed Cross Ambiguity Function - Direction Finding (CAF-DF) technique is compared with the Space Alternating Generalized Expectation Maximization (SAGE) technique. The CAF-DF, ...
    • High efficiency Lamb wave lens for subsurface imaging 

      Atalar, Abdullah; Köymen, Hayrettin (IEEE, 1989-10)
      A conventional scanning acoustic microscope lens excites all the possible modes of acoustic waves in the solid structure under examination. The excited leaky modes contribute significantly to the high contrast obtained in ...
    • A Lamb Wave Lens for Acoustic Microscopy 

      Atalar, Abdullah; Köymen, Hayrettin; Değertekin, F. Levent (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 ...
    • Modulation transfer function for the acoustic microscope 

      Atalar, Abdullah (The Institution of Engineering and Technology, 1979-05-24)
      A simple method to measure the modulation transfer function of an acoustic microscope is described. Theoretical results are compared with experimental measurements. An explanation of `shadowing´ found in acoustic images is given.