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Article Dans Une Revue Applied Acoustics Année : 2020

Investigation of the electrical limit conditions effects in piezoelectric transducer arrays utilized in medical imaging

Imane Laasri
  • Fonction : Auteur
Abdelmajid Bybi
  • Fonction : Auteur
  • PersonId : 1082419
Ouadia Mouhat
  • Fonction : Auteur
Mohammad Jamal
  • Fonction : Auteur
Aziz Ettahir
  • Fonction : Auteur
Kamal Kettani
  • Fonction : Auteur

Résumé

Crosstalk is considered as an undesirable phenomenon disturbing the electromechanical behavior of the ultrasonic transducer arrays used in medical imaging applications. Indeed, when one element of a transducer array is excited, it generates parasitic voltages and/or displacement fields on the adjacent passive elements. Consequently, these interactions between elements decrease the array's electroacoustic performance, which affects the obtained image quality. To overcome the crosstalk's problem, several research works propose active cancellation techniques. In this case, the correction voltages are determined by considering the array's elements grounded, contrary to the conventional crosstalk's definition which considers the array elements in Open-Circuit. The novelty of this paper is in one hand the study of the electrical limit conditions' effects on the physical behavior of a piezoelectric transducer array radiating in a fluid medium (water). On the other hand, a displacement method is proposed to evaluate the crosstalk level when the array elements are grounded. The limitations of the proposed method are also discussed. For this purpose, a piezoelectric transducer array is firstly modeled using a Two-dimensional Finite Elements Method (FEM), when the array elements are not grounded (open-circuit). Then, the results are compared to those obtained when the neighboring elements are grounded (as in the case of the crosstalk's active cancellation techniques). Finally, measurements are realized on a fabricated transducer array vibrating in air medium and are successfully compared to the results predicted using FEM.
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Dates et versions

hal-03019835 , version 1 (07-12-2020)

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Citer

Imane Laasri, Abdelmajid Bybi, Ouadia Mouhat, Mohammad Jamal, Anne-Christine Hladky, et al.. Investigation of the electrical limit conditions effects in piezoelectric transducer arrays utilized in medical imaging. Applied Acoustics, 2020, ⟨10.1016/j.apacoust.2020.107509⟩. ⟨hal-03019835⟩
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