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      Generation of focused surface waves with a solid wedge

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      Author(s)
      Atalar, Abdullah
      Köymen, Hayrettin
      Date
      1987
      Source Title
      Proceedings of the 1987 IEEE Ultrasonics Symposium
      Print ISSN
      0090-5607
      Publisher
      IEEE
      Pages
      681 - 684
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
      346
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      Abstract
      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 on the surface to be examined. A similar axicon can be implemented with a solid cylindrical structure which does not require an immersion liquid. The lower cap of a solid cylinder is placed on the surface of the solid object, while the upper cap, where a shear-wave transducer is placed, is inclined with respect to the axis of the cylinder. Shear waves generated by the transducer are reflected from the free cylindrical surface of the solid. The reflected waves are incident on the bottom surface at a critical angle and couple to the object surface as surface waves to converge to a diffraction limited focus. The cylindrical solid material must be chosen from low-shear-wave-velocity materials. The critical angle determines the inclination of the top surface; it is found from the solution of reflection problem for shear waves at a solid-solid interface with a slippery boundary condition. The focusing system is implemented successfully with lucite as the solid and aluminum as the object material.
      Keywords
      Acoustic imaging
      Acoustic surface wave devices - focusing
      Focused surface waves
      Saw focusing setup
      Solid wedge
      Surface waves
      Permalink
      http://hdl.handle.net/11693/27843
      Published Version (Please cite this version)
      https://doi.org/10.1109/ULTSYM.1987.199045
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      • Department of Electrical and Electronics Engineering 3863
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