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      • Faculty of Engineering
      • Department of Electrical and Electronics Engineering
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      Lens geometries for quantitative acoustic microscopy

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      Author
      Atalar, Abdullah
      Köymen, Hayrettin
      Bozkurt, Ayhan
      Yaralıoğlu, Göksenin
      Editor
      Briggs, A.
      Arnold, W.
      Date
      1995
      Publisher
      Springer
      Volume
      1
      Pages
      117 - 151
      Language
      English
      Type
      Book Chapter
      Item Usage Stats
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      112
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      Book Title
      Advances in acoustic microscopy
      Series
      Advances in acoustic microscopy;
      Abstract
      The purpose of the first Lemons-Quate acoustic microscope(1) was to image the surfaces of materials or biological cells with a high resolution. Unfortunately, competition with the optical microscope was only partially successful due to the high degree of absorption in the liquid-coupling medium at high frequencies. Increasing the resolution beyond optical limits was possible with the use of hot water(2) or cryogenic liquids,(3) at the cost of operational difficulty and system complexity. Meanwhile it was shown that the acoustic microscope can generate information that has no counterpart in the optical world.(4) The presence of leaky waves resulted in an interference mechanism known as V(z) curves. The V(z) method involves recording the reflected signal amplitude from an acoustic lens as a function of distance between the lens and the object. This recorded signal is shown to depend on elastic parameters of the object material. After underlying processes are well understood, new lens geometries or signal-processing electronics are designed to emphasize the advantage of the acoustic lens. In any case, the aim has been to increase the quantitative characterization ability of the microscope.
      Keywords
      Reflection coefficient
      Critical angle
      Lamb wave
      Object surface
      Spherical lens
      Permalink
      http://hdl.handle.net/11693/51241
      Published Version (Please cite this version)
      https://doi.org/10.1007/978-1-4615-1873-0_4
      https://doi.org/10.1007/978-1-4615-5851-4
      Collections
      • Department of Electrical and Electronics Engineering 3637
      • Institute of Materials Science and Nanotechnology (UNAM) 1891
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