• About
  • Policies
  • What is openaccess
  • Library
  • Contact
Advanced search
      View Item 
      •   BUIR Home
      • Scholarly Publications
      • Faculty of Engineering
      • Department of Electrical and Electronics Engineering
      • View Item
      •   BUIR Home
      • Scholarly Publications
      • Faculty of Engineering
      • Department of Electrical and Electronics Engineering
      • View Item
      JavaScript is disabled for your browser. Some features of this site may not work without it.

      Resonances and nonuniformities in CMUT elements or arrays

      Thumbnail
      View / Download
      1.0 Mb
      Author
      Atalar, Abdullah
      Köymen, Hayrettin
      Date
      2014-09
      Source Title
      2014 IEEE International Ultrasonics Symposium, IUS
      Publisher
      IEEE
      Pages
      297 - 300
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
      147
      views
      166
      downloads
      Abstract
      We determine the response of individual cells of a CMUT array immersed in water using the small-signal equivalent circuit of a single cell and radiation impedances. Using a numerically efficient technique, we are able to simulate large arrays. The results indicate the presence of resonances at low frequencies where Rayleigh-Bloch waves are excited on the surface of the array. Reflections from the edges cause standing-wave patterns. Above the cut-off frequency of Rayleigh-Bloch waves, no standing-wave pattern exists. However, there is nonuniformity among cell velocities mainly due to unequal radiation impedance seen by the cells. Rayleigh-Bloch waves and nonuniformity in cell velocities do not cause a significant degradation in the point spread function, but the oscillations extend the duration of impulse response, limiting the dynamic range. © 2014 IEEE.
      Keywords
      Cells
      Elastic waves
      Heterojunction bipolar transistors
      Impulse response
      Optical transfer function
      Dynamic range
      Individual cells
      Large arrays
      Non-uniformities
      Nonuniformity
      Radiation impedance
      Small signal equivalent circuit
      Standing wave patterns
      Cytology
      Permalink
      http://hdl.handle.net/11693/27857
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/ULTSYM.2014.0073
      Collections
      • Department of Electrical and Electronics Engineering 3524
      Show full item record

      Browse

      All of BUIRCommunities & CollectionsTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartmentsThis CollectionTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartments

      My Account

      Login

      Statistics

      View Usage StatisticsView Google Analytics Statistics

      Bilkent University

      If you have trouble accessing this page and need to request an alternate format, contact the site administrator. Phone: (312) 290 1771
      Copyright © Bilkent University - Library IT

      Contact Us | Send Feedback | Off-Campus Access | Admin | Privacy