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We numerically report a high efficient acoustic lens using a flat artificial composite plate in water, which is designed using silicone films deposited on PMMA plate engraved with the annular grooves. The focusing effect is due to the phase of the plate changing with the height of PMMA variation, while the total height of the plate is held constant. As both PMMA and silicone are low impedance mismatch...
Piezoelectric materials are at the heart of electromechanical devices, such as medical imaging transducer, high intensity focused ultrasound (HIFU), industrial nondestructive evaluation (NDE) and piezoelectric sensors, to name a few. In this presentation, the advantages and disadvantages of piezoelectric materials are discussed based on the requirements (figure of merit) of various applications, with...
Ultrasound has been demonstrated to be an effective approach for noninvasive neurostimulation. Low frequency ultrasound (<1 MHz) is preferable as its low ultrasonic attenuation when passing through the skull. High frequency ultrasound is able to provide reduced size of focal region. However, the performance of stimulation with high frequency ultrasound is not proved yet. This study examines the...
Relaxor-PbTiO 3 (PT) based ferroelectric crystals with the perovskite structure have been investigated over the last few decades due to their ultrahigh piezoelectric coefficients (d 33 >1500pC/N) and electromechanical coupling factors (k 33 >90%), far outperforming state-of-the-art ferroelectric polycrystalline Pb(Zr,Ti)O 3 ceramics, and are at the forefront of...
Microbubble ultrasound contrast agent (UCA) has been well recognized as a potential noninvasive tool for the blood pressure measurement. A decrease in subharmonic amplitude of 9 to 12 dB has been reported for Levovist, Optison, Definity, Sonazoid, and SonoVue for ambient overpressure values around 180 mmHg. However, a pressure resolution of 3 mmHg is desirable in medical diagnostics, it is still necessary...
Piezoelectric materials lie at the heart of electromechanical devices. Applications include actuators, ultrasonic imaging, high intensity focused ultrasound, underwater ultrasound, nondestructive evaluation transducer, pressure sensors, and accelerometers, to name a few. In this work, the advantages and disadvantages of relaxor-PbTiO3-based single crystals are discussed, based on the requirements...
Piezoelectric materials lie at the heart of electromechanical transducers. Applications include actuators, ultrasonic imaging and high intensity focused ultrasound (HIFU), underwater sonar, non-destructive evaluation (NDE), resonators, pressure sensors and accelerometers to name a few. In this work, we report on recent developments of the shear properties of Relaxor-PT single crystals with different...
Pb(Mg1/3Nb2/3)O3-PbTiO3 based ferroelectric single crystals have been extensively studied for various applications. In this paper, the advantages and issues of crystals are discussed, based on requirements of transducers, actuators and sensors, with emphasis on Pb(In0.5Nb0.5)O3- Pb(Mg1/3Nb2/3)O3-PbTiO3 crystals.
25Pb(In1/2Nb1/2)O3-45Pb(Mg1/3Nb2/3)O3 -30PbTiO3 (PIN-PMN-PT) ingots with the dimensions of Ø55×130mm were successfully grown by vertical Bridgman technique. The as-grown PIN-PMN-PT crystals were oriented and characterized on (001) cuts. Variation of di-/piezoelectric properties of the as-grown PIN-PMN-PT crystals near morphotropic phase boundary (MPB) along the growth direction were investigated....
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