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 ...
    • Bi-angular lens for material characterization 

      Yaralioglu G.G.; Atalar, Abdullah; Koymen H. (IEEE, Piscataway, NJ, United States, 1994)
      In this paper a new lens design is proposed for characterization of layered materials. Lamb wave lens employs Lamb waves for this purpose since these waves propagate along interfaces. However, below cut-off angle, the ...
    • Identification of target primitives with multiple decision-making sonars using evidential reasoning 

      Ayrulu, B.; Barshan, B. (Sage Publications Ltd., 1998-06)
      In this study, physical models are used to model reflections from target primitives commonly encountered in a mobile robot's environment. These targets are differentiated by employing a multitransducer pulse/echo system ...
    • Radius of curvature estimation and localization of targets using multiple sonar sensors 

      Barshan, B.; Sekmen, A. S. (A I P Publishing LLC, 1999-04)
      Acoustic sensors have been widely used in time-of-flight ranging systems since they are inexpensive and convenient to use. One of the most important limitations of these sensors is their low angular resolution. To improve ...
    • 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 ...