Franck Levassort
YOU?
Author Swipe
View article: Sulcus measurement by high frequency ultrasound imaging ex-vivo: an exploratory study
Sulcus measurement by high frequency ultrasound imaging ex-vivo: an exploratory study Open
Aim: The aim of this study was to compare the measurement of periodontal pocket by ultrasound in comparison with gold standard measurements ex-vivo. Material and methods: A total of 12 hemi-jaws were included in the study. Ultrasound measu…
View article: Intraoral Ultrasonography for the Exploration of Periodontal Tissues: A Technological Leap for Oral Diagnosis
Intraoral Ultrasonography for the Exploration of Periodontal Tissues: A Technological Leap for Oral Diagnosis Open
Introduction: Periodontal disease is an infectious syndrome presenting inflammatory aspects. Radiographic evaluation is an essential complement to clinical assessment but has limitations such as the impossibility of assessing tissue inflam…
View article: Nanomechanical characterization of BiFeO3 ferroelectric ceramics
Nanomechanical characterization of BiFeO3 ferroelectric ceramics Open
International audience
View article: BaHf0.05Ti0.95O3 Ceramics from Sol–Gel and Solid-State Processes: Application to the Modelling of Piezoelectric Energy Harvesters
BaHf0.05Ti0.95O3 Ceramics from Sol–Gel and Solid-State Processes: Application to the Modelling of Piezoelectric Energy Harvesters Open
A typical piezoelectric energy harvester is a bimorph cantilever with two layers of piezoelectric material on both sides of a flexible substrate. Piezoelectric layers of lead-based materials, typically lead zirconate titanate, have been ma…
View article: Synthesis of a Stable and High-Concentration BaHfxTi1−xO3 Sol–Gel for High Electromechanical Performance of Bulk Ceramics
Synthesis of a Stable and High-Concentration BaHfxTi1−xO3 Sol–Gel for High Electromechanical Performance of Bulk Ceramics Open
Lead-based materials are widely used in piezoceramics due to their high electromechanical properties. However, due to environmental protection and sustainable development, the use of the toxic element lead (Pb) in electronic devices is str…
View article: Modeling a Fluid-Coupled Single Piezoelectric Micromachined Ultrasonic Transducer Using the Finite Difference Method
Modeling a Fluid-Coupled Single Piezoelectric Micromachined Ultrasonic Transducer Using the Finite Difference Method Open
A complete model was developed to simulate the behavior of a circular clamped axisymmetric fluid-coupled Piezoelectric Micromachined Ultrasonic Transducer (PMUT). Combining Finite Difference and Boundary Element Matrix (FD-BEM), this model…
View article: Effect of thermal annealing on dielectric and ferroelectric properties of aerosol-deposited $0.65\text{Pb}(\text{Mg}_{1/3}\text{Nb}_{2/3})\text{O}_{3}-0.35\text{PbTiO}_{3}$ thick films
Effect of thermal annealing on dielectric and ferroelectric properties of aerosol-deposited $0.65\text{Pb}(\text{Mg}_{1/3}\text{Nb}_{2/3})\text{O}_{3}-0.35\text{PbTiO}_{3}$ thick films Open
In this work, the effects of thermal annealing at 500 °C on aerosol-deposited $0.65\text{Pb}(\text{Mg}_{1/3}\text{Nb}_{2/3})\text{O}_{3}-0.35\text{PbTiO}_{3}$ thick films on stainless-steel substrates are investigated using two complementa…
View article: Modeling a Fluid Coupled Single PMUT Using the Finite Difference Method
Modeling a Fluid Coupled Single PMUT Using the Finite Difference Method Open
A complete model was developed to simulate the behavior of a circular clamped axisymmetric fluid-coupled Piezoelectric Micromachined Ultrasonic Transducer (PMUT). Combining Finite Difference and Boundary Element Matrix (FD-BEM), this model…
View article: High-Frequency Linear Array (20 MHz) Based on Lead-Free BCTZ Crystal
High-Frequency Linear Array (20 MHz) Based on Lead-Free BCTZ Crystal Open
Centimeter-sized BaTiO3-based crystals grown by top-seeded solution growth from the BaTiO3-CaTiO3-BaZrO3 system were used to process a high-frequency (HF) lead-free linear array. Piezoelectric plates with (110)pc cut within 1° accuracy wer…
View article: High Acoustic Impedance and Attenuation Backing for High-Frequency Focused P(VDF-TrFE)-Based Transducers
High Acoustic Impedance and Attenuation Backing for High-Frequency Focused P(VDF-TrFE)-Based Transducers Open
Backing materials with tailored acoustic properties are beneficial for miniaturized ultrasonic transducer design. Whereas piezoelectric P(VDF-TrFE) films are common elements in high-frequency (>20 MHz) transducer design, their low coupling…
View article: The Ever-Growing Field of High-Frequency Biomedical Ultrasound
The Ever-Growing Field of High-Frequency Biomedical Ultrasound Open
Compared with other medical imaging counterparts, ultrasound has advantages owing to its real-time imaging capability, easy access, and cost-effectiveness. High-frequency (>20 MHz) ultrasound has been developed over the last few decades an…
View article: Comparaison théorique des performances de transducteurs mono-élément haute fréquence (50MHz) en utilisant différentes techniques de focalisation
Comparaison théorique des performances de transducteurs mono-élément haute fréquence (50MHz) en utilisant différentes techniques de focalisation Open
International audience
View article: Implémentation d'un circuit électromécanique d'une cellule pMUT vibrant dans l'air
Implémentation d'un circuit électromécanique d'une cellule pMUT vibrant dans l'air Open
International audience
View article: Publisher's Note: “Effect of thermal annealing on dielectric and ferroelectric properties of aerosol-deposited 0.65Pb(Mg1/3Nb2/3)O3-0.35PbTiO3 thick films” [Appl. Phys. Lett. <b>120</b>, 112902 (2022)]
Publisher's Note: “Effect of thermal annealing on dielectric and ferroelectric properties of aerosol-deposited 0.65Pb(Mg1/3Nb2/3)O3-0.35PbTiO3 thick films” [Appl. Phys. Lett. <b>120</b>, 112902 (2022)] Open
First Page
View article: Effect of thermal annealing on dielectric and ferroelectric properties of aerosol-deposited 0.65Pb(Mg1/3Nb2/3)O3-0.35PbTiO3 thick films
Effect of thermal annealing on dielectric and ferroelectric properties of aerosol-deposited 0.65Pb(Mg1/3Nb2/3)O3-0.35PbTiO3 thick films Open
In this work, the effects of thermal annealing at 500 °C on aerosol-deposited 0.65Pb(Mg1/3Nb2/3)O3-0.35PbTiO3 thick films on stainless-steel substrates are investigated using two complementary methods at high and low applied external elect…
View article: Screen Printed Copper and Tantalum Modified Potassium Sodium Niobate Thick Films on Platinized Alumina Substrates
Screen Printed Copper and Tantalum Modified Potassium Sodium Niobate Thick Films on Platinized Alumina Substrates Open
We show how sintering in different atmospheres affects the structural, microstructural, and functional properties of ~30 μm thick films of K0.5Na0.5NbO3 (KNN) modified with 0.38 mol% K5.4Cu1.3Ta10O29 and 1 mol% CuO. The films were screen p…
View article: Homogenization of periodic 1-3 piezocomposite using wave propagation: Toward an experimental method
Homogenization of periodic 1-3 piezocomposite using wave propagation: Toward an experimental method Open
1-3 piezocomposites are first choice materials for integration in ultrasonic transducers due to their high electromechanical performance, particularly, in their thickness mode. The determination of a complete set of effective electroelasti…
View article: Inkjet-Printing-Derived Lead-Zirconate-Titanate-Based Thick Films for Printed Electronics
Inkjet-Printing-Derived Lead-Zirconate-Titanate-Based Thick Films for Printed Electronics Open
We have investigated the processing of lead-zirconate-titanate-based thick films by inkjet printing Pb (Zr0.53Ti0.47)0.98Nb0.02O3 with a 6 mol% excess of PbO nanosized powder dispersed in water. Different waveforms were employed to determi…
View article: [Invited] Texturation of lead-free BaTiO<sub>3</sub> based piezoelectric ceramics
[Invited] Texturation of lead-free BaTiO<sub>3</sub> based piezoelectric ceramics Open
International audience
View article: Inkjet-printing-derived lead-zirconate-titanate-based thick films for printed electronics
Inkjet-printing-derived lead-zirconate-titanate-based thick films for printed electronics Open
We have investigated the processing of lead-zirconate-titanate-based thick films by inkjet printing Pb(Zr0.53Ti0.47)0.98Nb0.02O3 with a 6 mol% excess of PbO nanosized powder dispersed in water. Different waveforms were employed to determin…
View article: Characterization of 1-3 Piezocomposite Using Lamb Waves Propagation
Characterization of 1-3 Piezocomposite Using Lamb Waves Propagation Open
View article: Theoretical Electroelastic Moduli of Porous Textured Piezoceramics
Theoretical Electroelastic Moduli of Porous Textured Piezoceramics Open
Nowadays, piezoceramics are commonly used in ultrasonic transducers (underwater applications, medical imaging, NDT ...). Most of them are PZT-based materials (Pb(Zr, Ti)O3), which causes environmental issues due to the presence of lead. To…
View article: Complete electroelastic set of co doped barium titanate for transducer applications
Complete electroelastic set of co doped barium titanate for transducer applications Open
Barium titanate (BaTiO3) is a well-known ferroelectric material which was intensively studied in the early 50's. Indeed, BaTiO3 has been rapidly substituted by lead zirconate titanate (PZT) materials, which exhibit higher piezoelectric pro…
View article: Unified model for the electromechanical coupling factor of orthorhombic piezoelectric rectangular bar with arbitrary aspect ratio
Unified model for the electromechanical coupling factor of orthorhombic piezoelectric rectangular bar with arbitrary aspect ratio Open
Piezoelectric Single Crystals (PSC) are increasingly used in the manufacture of ultrasonic transducers and in particular for linear arrays or single element transducers. Among these PSCs, according to their microstructure and poled directi…
View article: Processing and sintering of sodium-potasium niobate-based thick films
Processing and sintering of sodium-potasium niobate-based thick films Open
International audience
View article: Structural and piezoelectric properties evolution induced by cobalt doping and cobalt/niobium co-doping in BaTiO3
Structural and piezoelectric properties evolution induced by cobalt doping and cobalt/niobium co-doping in BaTiO3 Open
View article: 1&#x2013;3 Piezocomposites Based on Super-Cell Structuring for Transducer Applications
1–3 Piezocomposites Based on Super-Cell Structuring for Transducer Applications Open
—In ultrasound transducers, the most popular fabrication method for 1-3 piezocomposites is the « dice and fill » method where lateral periodicity p is introduced and leads to the occurrence of lateral modes. These spurious modes can drasti…
View article: Tonpilz Underwater Acoustic Transducer Integrating Lead-free Piezoelectric Material
Tonpilz Underwater Acoustic Transducer Integrating Lead-free Piezoelectric Material Open
International audience