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Phononic crystals (PnC) consist of two or more materials arranged in a spatially periodic manner. Introduction of a defect into the crystal lattice is a technique to create resonant modes. The idea behind the application of a PnC as sensor element is the dependence of the characteristic features of those modes on speed of sound. Currently the sensor designs are based on common 2D phononic crystal...
In ultrasound imaging, cross coupling of transducer elements through the medium has significant effect on the frequency response, thus affecting the quality of the ultrasound image. In Side-Looking Intravascular Ultrasound (SL-IVUS) imaging a radial image of the vessel wall is formed using a transducer array in a cylindrical configuration. Recent advances in Capacitive Micromachined Ultrasound Transducer...
An ultrasonic transducer technology to generate wideband impulses using a one-dimensional chain of spheres was previously presented. The Hertzian contact between the spheres causes the nonlinearity of the system to increase, which transforms high amplitude narrowband sinusoidal input into a train of wideband impulses. Generation of short duration ultrasonic pulses is desirable both in diagnostic and...
As more LTE bands are squeezed into the crowded global RF spectrum interference becomes a major concern. Some cases require profoundly steep transitions from passband to the tightly packed neighboring bands. The most demanding high frequency LTE bands may only be served with high-performance BAW resonators that have been temperature compensated to have essentially zero temperature drift. There is...
Under specific ultrasound excitation, contrast microbubbles undergo nonlinear oscillations. Considering the size and the complexity of the phenomenon, expensive and complex experiments and/or simulations are required. To overcome this, the use of an analogy has been proposed and validated. A chain of coupled oscillators has been optimized in order to re-scale the bubble ultrasonic oscillation at the...
In 2D 360° Spatial Compounding (SC) envelope detected pulse-echo data from a conventional linear probe is superimposed from 360° in parallel cross-sectional planes to improve B mode image quality. Latest research of our group has shown that extending this concept to 3D by utilizing a motorized 1D array (3D probe) brings along substantial gain in image quality and significance of 360°-SC for diagnosis...
Bubbles insonified by ultrasound can exhibit shape deformations and no more oscillate upon a purely spherical mode. Understanding and predicting the appearance of surface oscillations is essential for typical applications based on the acoustic response of bubbles (e.g. the use of contrast agents in echographic imaging), partly because shape modes can contribute to the monopole emission of sound by...
Shear wave inspection is generated from mode conversion of longitudinal waves, using a selected, angled wedge positioned between the transducer and the test specimen. However, in certain scenarios where access is restricted the combination of the transducer and the wedge can be too cumbersome for in situ deployment. In this work, a low profile, linear ultrasound array transducer is proposed to generate...
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