Manufacturing and experimental investigation of 2-2 piezocomposite transducer arrays (original) (raw)

The relative lack of experimental data relative to 2-2 piezocomposites stimulated the present experimental investigation of the vibration behaviour of 2-2 PZT-polymer composite transducers array for clinical ultrasound equipments, that was carried on for several prototypes having the same dicing pitch of 0,11 mm and different volume fractions and thickness values. Many array transducers were manufactured from the 2-2 plates, with subsequent deposition of the electrodes by a second dice-and-fill technique with pitch of 0,245 mm. In these latter conditions, the 2-2 plate becomes an "asymmetric" 1-3 composite and thus a more complex vibration pattern of the structure should be expected. Several cases of different volume fractions of 2-2 plate were investigated (70, 65, 60, 50 and 40 percent) and for each volume fractions several composite transducer arrays having the thickness mode resonance within the range from 2,6 MHz to 8 MHz were manufactured and analyzed. Measurements w...