Ultrasonic transducers based on curved lead-free piezoelectric thick films for high resolution medical imaging - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2012

Ultrasonic transducers based on curved lead-free piezoelectric thick films for high resolution medical imaging

Konstantin Astafiev
  • Fonction : Auteur
  • PersonId : 939528
Rasmus Lou-Moeller
  • Fonction : Auteur
Jean-Marc Grégoire
Lise Nielsen
  • Fonction : Auteur
  • PersonId : 939530
Wanda W. Wolny
  • Fonction : Auteur
  • PersonId : 939531
Marc Lethiecq

Résumé

KNN-based lead free ferroelectric materials are receiving much attention due to their high electromechanical properties that make them promising candidates to replace the lead-based piezoceramics that will eventually be banned by environmental regulations in many countries over the world. Studies include the development of KNN thick films that are particularly well adapted for high frequency applications due to higher wave velocities and a dielectric constant in an acceptable range for single element transducers. Here, a KNN based thick film is deposited on a curved substrate by pad-printing in order to be used in a focused high frequency transducer. This substrate is a porous lead-free KNN cylinder specifically developed to exhibit the required acoustical properties of a backing (acoustical impedance, high attenuation…) and is compatible with the high sintering temperature of the KNN thick film. Electromechanical properties of the piezoelectric thick film in thickness mode were deduced (kt over 35%). This structure was used to fabricate a transducer which was characterized (relative bandwidth over 90%). Finally this transducer was integrated in a high frequency imaging system and its performance allowed skin images to be produced. To conclude, the replacement of lead-based high frequency transducers by “green” devices is a viable option.
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Dates et versions

hal-00810928 , version 1 (23-04-2012)

Identifiants

  • HAL Id : hal-00810928 , version 1

Citer

Franck Levassort, Konstantin Astafiev, Rasmus Lou-Moeller, Jean-Marc Grégoire, Lise Nielsen, et al.. Ultrasonic transducers based on curved lead-free piezoelectric thick films for high resolution medical imaging. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810928⟩
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