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Communication Dans Un Congrès Année : 2012

Comparison of various models to compute the vibro-acoustic response of large CMUT arrays

Résumé

Capacitive Micromachined Ultrasound Transducers (CMUT) is a promising alternative to piezo-electric transducers for medical imaging. CMUT generally comprises more than 10 thousand unitary cells. When immersed in a fluid the cells are strongly coupled by the fluid, leading to cross talk effects. Accurate simulation tools that take into account properly all these coupling are very much CPU time consuming. From an engineering point of view it will be interesting to use simplified models to conduct parametric studies. We propose in this paper to evaluate various simplified models in term of accuracy and CPU time. As a test case, we chose a typical 1D CMUT array in which groups of several hundreds of cells, called elements, are electrically connected. The reference model takes into account explicitly the contribution of all the cells to compute, in the harmonic domain, the displacement field on the transducer surface and the radiated pressure. A first class of simplified models is built by introducing constraints on the cells displacements of the reference model. A second class of simplified models considers infinite array for which periodic conditions can be defined.
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Dates et versions

hal-00811270 , version 1 (23-04-2012)

Identifiants

  • HAL Id : hal-00811270 , version 1

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Marc Berthillier, Patrice Le Moal, Joseph Lardies. Comparison of various models to compute the vibro-acoustic response of large CMUT arrays. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811270⟩
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