| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Khuri-Yakub, Butrus T.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (13/13 displayed)
- 2013Integrated Circuits for Volumetric Ultrasound Imaging With 2-D CMUT Arrayscitations
- 2013A Comparison Between Conventional and Collapse-Mode Capacitive Micromachined Ultrasonic Transducers in 10-MHz 1-D Arrayscitations
- 2012Volumetric Real-Time Imaging Using a CMUT Ring Arraycitations
- 2012Deep Tissue Photoacoustic Imaging Using a Miniaturized 2-D Capacitive Micromachined Ultrasonic Transducer Arraycitations
- 2011Chemical Vapor Detection Using a Capacitive Micromachined Ultrasonic Transducercitations
- 20103-D Deep Penetration Photoacoustic Imaging with a 2-D CMUT Array.
- 2009Three-Dimensional Photoacoustic Imaging Using a Two-Dimensional CMUT Arraycitations
- 2009An Integrated Circuit With Transmit Beamforming Flip-Chip Bonded to a 2-D CMUT Array for 3-D Ultrasound Imagingcitations
- 2009Wafer-Bonded 2-D CMUT Arrays Incorporating Through-Wafer Trench-Isolated Interconnects with a Supporting Framecitations
- 2008Integration of 2D CMUT arrays with front-end electronics for volumetric ultrasound imagingcitations
- 2007Integration of trench-isolated through-wafer interconnects with 2d capacitive micromachined ultrasonic transducer arrayscitations
- 2007Finite element modeling and experimental characterization of crosstalk in 1-D CMUT arrayscitations
- 20063-D ultrasound imaging using a forward-looking CMUT ring array for intravascular/intracardiac applications
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article
Finite element modeling and experimental characterization of crosstalk in 1-D CMUT arrays
Abstract
Crosstalk is the coupling of energy between the elements of an ultrasonic transducer array. This coupling degrades the performance of transducers in applications such as medical imaging and therapeutics. In this paper, we present an experimental demonstration of guided interface waves in capacitive micromachined ultrasonic transducers (CMUTs). We compare the experimental results to finite element calculations using a commercial package (LS-DYNA) for a 1-D CMUT array operating in the conventional and collapsed modes. An element in the middle of the array was excited with a unipolar voltage pulse, and the displacements were measured using a laser interferometer along the center line of the array elements immersed in soybean oil. We repeated the measurements for an identical CMUT array covered with a 4.5-microm polydimethylsiloxane (PDMS) layer. The main crosstalk mechanism is the dispersive guided modes propagating in the fluid-solid interface. Although the transmitter element had a center frequency of 5.8 MHz with a 130% fractional bandwidth in the conventional operation, the dispersive guided mode was observed with the maximum amplitude at a frequency of 2.1 MHz, and had a cut-off frequency of 4 MHz. In the collapsed operation, the dispersive guided mode was observed with the maximum amplitude at a frequency of 4.0 MHz, and had a cut-off frequency of 10 MHz. Crosstalk level was lower in the collapsed operation (-39 dB) than in the conventional operation (-24.4 dB). The coverage of the PDMS did not significantly affect the crosstalk level, but reduced the phase velocity for both operation modes. Lamb wave modes, A0 and S0, were also observed with crosstalk levels of -40 dB and -65 dB, respectively. We observed excellent agreement between the finite element and the experimental results.