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      • Department of Electrical and Electronics Engineering
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      Anisotropy sensitivity of an acoustic lens with slit aperture

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      Author
      Atalar, Abdullah
      Ishikawa, I.
      Ogura, Y.
      Tomita, K.
      Date
      1993
      Source Title
      Proceedings of the 1993 IEEE Ultrasonics Symposium
      Print ISSN
      1051-0117
      Publisher
      IEEE
      Pages
      613 - 616
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
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      129
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      Abstract
      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 to obtain varying slit widths. The resulting lens can be used in conjunction with V(Z) method to obtain leaky wave velocities of the sample under investigation as a function of direction. The theoretical V(Z) analysis of the lens involves a two-dimensional integral rather than one-dimensional integral of the conventional lens. Single crystal anisotropic materials are chosen as test samples. Reflection coefficients for anisotropic single crystals of given surface cut and orientation are calculated. Numerically evaluated V(Z) curves are used to deduce the surface wave velocity of the object for the given orientation. This is compared with the surface wave velocity directly calculated from the elastic parameters of the object. Results show the compromise between signal-to-noise ratio and angular resolution as the slit width is varied. V(Z) measurement results of a slitted lens are presented to be compared with calculated curves. The new lens is used to measure the acoustic velocity on the (001) surface of GaAs along varying directions with differing slit widths.
      Keywords
      Acoustic wave reflection
      Acoustic wave velocity measurement
      Anisotropy
      Crystal orientation
      Crystals
      Elasticity
      Integral equations
      Lenses
      Semiconducting gallium arsenide
      Sensitivity analysis
      Signal to noise ratio
      Surface waves
      Acoustic lenses
      Directional sensitivity
      Leaky surface acoustic waves
      Slit aperture
      V(Z) curves
      Acoustic microscopes
      Permalink
      http://hdl.handle.net/11693/27794
      Published Version (Please cite this version)
      https://doi.org/10.1109/ULTSYM.1993.339525
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      • Department of Electrical and Electronics Engineering 3524
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