The coupling of waves between the piezoelectric generators, detectors, and propagating
media is challenging due to mismatch in the acoustic properties. The mismatch leads to the …

Effective transmission of sound from water to air is crucial for the enhancement of the
detection sensitivity of underwater sound. However, only 0.1% of the acoustic energy is …

Piezoelectric ultrasonic transducers have shown great potential in biomedical applications
due to their high acoustic-to-electric conversion efficiency and large power capacity. The …

Ultrasonic transducers for nondestructive testing (NDT) require wide bandwidth and high
sensitivity to obtain good axial resolution and strong signal reception, which requires active …

Matching layer is a critical component that determines the performance of piezoelectric
ultrasound transducer. For most piezoelectric materials, their acoustic impedances are …

An air-coupled acoustic matching layer, based on hollow glass microsphere composite, was
developed for air-coupled ultrasonic transducers. The effects of the matrix, powder series …

Cross-coupling in piezoelectric transducer arrays is an undesirable phenomenon which
decreases the performance of these devices. Indeed, when one element of a transducer is …

The high-frequency ultrasonic transducers with larger bandwidths yield excellent imaging
performance in the biomedical field. However, achieving perfect acoustic impedance …

A quarter-wave impedance-matching element inserted between two dissimilar media allows
full-power transmission, but this phenomenon occurs only when the mode of the incident …

Therapeutic ultrasound technologies using microbubbles require a feedback control system
to perform the treatment in a safe and effective manner. Current feedback control …