Now showing items 1-14 of 14

    • Analysis of mutual acoustic coupling in CMUT arrays using an accurate lumped element nonlinear equivalent circuit model 

      Oguz H.K.; Atalar, Abdullah; Koymen H. (2012)
      We use an accurate nonlinear equivalent circuit model to analyze CMUT arrays with multiple cells, where every cell in the array is coupled to other cells at their acoustic terminals through a mutual radiation impedance ...
    • Design and implementation of capacitive micromachined ultrasonic transducers for high power 

      Yamaner F.Y.; Olcum, S.; Bozkurt, A.; Köymen H.; Atalar, Abdullah (2011)
      Capacitive micromachined ultrasonic transducers (CMUTs) have a strong potential to compete piezoelectric transducers in high power applications. In a CMUT, obtaining high port pressure competes with high particle velocity: ...
    • Equivalent circuit-based analysis of CMUT cell dynamics in arrays 

      Oğuz, H. K.; Atalar, Abdullah; Köymen, H. (IEEE, 2013)
      Capacitive micromachined ultrasonic transducers (CMUTs) are usually composed of large arrays of closely packed cells. In this work, we use an equivalent circuit model to analyze CMUT arrays with multiple cells. We study ...
    • High Power CMUTs: design and experimental verification 

      Yamaner, F. Y.; Olcum, S.; Oguz, H. K.; Bozkurt, A.; Koymen, H.; Atalar, Abdullah (IEEE, 2012)
      Capacitive micromachined ultrasonic transducers (CMUTs) have great potential to compete with piezoelectric transducers in high-power applications. As the output pressures increase, nonlinearity of CMUT must be ...
    • Lumped element modeling of CMUT arrays in collapsed mode 

      Aydogdu, E.; Ozgurluk, A.; Atalar, Abdullah; Koymen H. (IEEE Computer Society, 2014)
      This study focuses on modeling collapsed modeoperation of CMUT arrays, and obtaining a small signal lumped element model for collapsed mode operation. Having the large signal model for single CMUT from previous studies, ...
    • Nonlinear equivalent circuit model for circular CMUTs in uncollapsed and collapsed mode 

      Aydogdu, E.; Ozgurluk, A.; Oguz H.K.; Atalar, Abdullah; Kocabas, C.; Koymen H. (2012)
      An equivalent electrical circuit model valid for collapsed mode operation of CMUT is described. The across and through variables of the circuit model are chosen to be rms force and rms displacement over the surface of the ...
    • Optimizing CMUT geometry for high power 

      Yamaner F.Y.; Olcum, S.; Bozkurt, A.; Koymen H.; Atalar, Abdullah (2010)
      Capacitive micromachined ultrasonic transducers (CMUTs) have demonstratedvarious advantages over piezoelectric transducers. However, current CMUT designsproduce low output pressures with high harmonic distortions. Optimizing ...
    • Parametric nonlinear lumped element model for circular CMUTs in collapsed mode 

      Aydoǧdu, E.; Ozgurluk, A.; Atalar, Abdullah; Köymen, H. (2014)
      We present a parametric equivalent circuit model for a circular CMUT in collapsed mode. First, we calculate the collapsed membrane deflection, utilizing the exact electrical force distribution in the analytical formulation ...
    • Radiation impedance and equivalent circuit for immersed CMUT array element 

      Senlik, M.N.; Atalar, Abdullah; Koymen H.; Olcum, S. (2006)
      In this paper, we present equivalent circuit for immersed capacitive micromachined ultrasonic transducers (cMUT), based on an accurate parametric model. We also present an accurate approximation for the radiation impedance ...
    • Radiation impedance of an array of circular capacitive micromachined ultrasonic transducers 

      Senlik, M. N.; Olcum, S.; Köymen, H.; Atalar, Abdullah (IEEE, 2010)
      The radiation impedance of a capacitive micromachined ultrasonic transducer (cMUT) with a circular membrane is calculated analytically using its velocity profile for the frequencies up to its parallel resonance frequency ...
    • Radiation impedance of an array of circular capacitive micromachined ultrasonic transducers in collapsed state 

      Ozgurluk, A.; Atalar, Abdullah; Koymen, H.; Olcum, S. (IEEE, 2011)
      Radiation impedance is one of the important parameters in designing efficient and wideband capacitive micro-machined ultrasonic transducer (CMUT) arrays. It determines how much acoustical power is generated in the surrounding ...
    • Radiation impedance of collapsed capacitive micromachined ultrasonic transducers 

      Ozgurluk, A.; Atalar, Abdullah; Köymen, H.; Olçum, S. (Institute of Electrical and Electronics Engineers, 2012)
      The radiation impedance of a capacitive micromachined ultrasonic transducer (CMUT) array is a critical parameter to achieve high performance. In this paper, we present a calculation of the radiation impedance of collapsed, ...
    • Rayleigh-bloch waves in CMUT arrays 

      Atalar, Abdullah; Köymen, H.; Oğuz, H. K. (Institute of Electrical and Electronics Engineers Inc., 2014)
      Using the small-signal electrical equivalent circuit of a capacitive micromachined ultrasonic transducer (CMUT) cell, along with the self and mutual radiation impedances of such cells, we present a computationally efficient ...
    • Resonances and nonuniformities in CMUT elements or arrays 

      Atalar, Abdullah; Köymen H. (IEEE Computer Society, 2014)
      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 ...