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Your search keyword '"Mounier, Denis"' showing total 4 results
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4 results on '"Mounier, Denis"'

1. Détermination expérimentale des courbes de dispersion des Ondes Acoustiques de Surface (SAW) se propageant dans des multicouches métalliques déposées sur substrat de silicium

Author

Dammak, Yosra, Mounier, Denis, Yaakoubi, N., Thomas, Jean-Hugh, Ben Ghozlen, Mohamed Hedi, Laboratoire d'Acoustique de l'Université du Mans (LAUM), Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM), Laboratoire de physique de l'état condensé (LPEC), Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Matériaux, Faculté de Science de Sfax, Université de Sfax - University of Sfax, Institut des Molécules et Matériaux du Mans (IMMM), Le Mans Université (UM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Ecole Nationale Supérieure d'Ingénieurs du Mans (ENSIM), Laboratoire des Matériaux Composites céramiques et Polymères [Université de Sfax] (LaMaCoP), and Université de Sfax

Subjects
ComputingMilieux_MISCELLANEOUS, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Abstract

International audience; L’ étude présentée consiste à déterminer les courbes de dispersion des modes de Rayleigh se propageant dans des multicouches Ni/Cu et Ni/CST/Cu déposées sur silicium pour deux orientations cristallographiques (100) et (111). Les modes de Rayleigh sont excités par un laser impulsionnel subnanoseconde et détectés par une sonde laser interférométrique. Les courbes de dispersion mesurées sont comparées aux courbes calculées à partir du formalisme de Stroh. Une technique d’estimation de l’épaisseur des multicouches est également proposée.

Published
2016

2. Gigahertz laser resonant ultrasound spectroscopy for the evaluation of transverse elastic properties of micrometric bers

Author

Mounier, Denis, Poilane, Christophe, Khelfa, Haithem, Picart, Pascal, Picart, Pascal, Institut des Molécules et Matériaux du Mans (IMMM), Le Mans Université (UM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Acoustique de l'Université du Mans (LAUM), Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), and Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM)

Subjects
[PHYS.MECA.VIBR]Physics [physics]/Mechanics [physics]/Vibrations [physics.class-ph], [PHYS.MECA.SOLID] Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], cylinder, [PHYS.MECA.VIBR] Physics [physics]/Mechanics [physics]/Vibrations [physics.class-ph], ber, laser ultrasonics, laser interferometry, [SPI.MECA.VIBR]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Vibrations [physics.class-ph], [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Mechanics of the solides [physics.class-ph], [SPI.MECA.MEMA] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], Rayleigh modes, eigenmodes, [PHYS.MECA.MEMA] Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], design of experiment (DOE), [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], resonant ultrasound spectroscopy (RUS), wave gallery modes, nite element modeling, [SPI.MECA.SOLID] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], [SPI.MECA.VIBR] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Vibrations [physics.class-ph], [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph]
Abstract

The cross section eigenmodes of micrometric cylinders were measured in the range of several tenth of MHz to about 0:5 GHz. The vibrations were excited using subnanosecond laser pulses. The cross section eigenmodes were simulated using nite element modeling in a 2D geometry. Using the method of resonant ultrasound spectroscopy, the vibration spectrum of an aluminum wire of diameter 33 μm served to determine the transverse Young modulus and Poisson ratio with a precision of 0.7% and 0.3%, respectively. The calculated and measured frequencies of cross section eigenmodes were tted with a precision better than 0.5% in the 50-500MHz range.

Published
2013

3. Generation and detection of sinusoidal ultrasonic waves in the GHz-THz frequency range

Author

Mounier, Denis, NOWAK, Tomasz, BRETEAU, Jean-Marc, Vaudel, Gwenäelle, Pezeril, Thomas, Picart, Pascal, Ruello, Pascal, Goussev, Vitali, Laboratoire de physique de l'état condensé (LPEC), Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM), Laboratoire d'Acoustique de l'Université du Mans (LAUM), Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS), and Société Française d'Acoustique

Subjects
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], laser ultrasonics, acoustic spectroscopy, Physics::Optics, THz acoustic waves
Abstract

International audience; Through a sinusoidal thermo-modulation of a thin metallic film deposited on a substrate, monochromatic acoustic waves can be generated in the substrate (Damen, PRL 1995). Two interfering tunable lasers are used to induce a thermo-modulation at a frequency equal to the lasers beating frequency. Thus, the generated ultrasonic waves can be continuously tuned from 0 Hz up to the THz range by tuning the optical frequency of each pump laser. For the detection of the sinusoidal acoustic waves, an additional CW laser is used as a probe, which interacts with the laser-generated acoustic beam. The detection of the weak perturbation of the probe beam intensity induced by the acoustic beam requires a particular modulation of the pump lasers. We describe the experiments, which demonstrate that the detection of sinusoidal acoustic waves at frequencies in the GHz-THz range is possible. With a precise control of the optical frequency of both pump lasers, it becomes feasible to generate monochromatic acoustic waves with a very narrow line-width, typically less than one MHz. Ultrasound spectroscopy with high resolution is achievable using such monochromatic acoustic waves. This technique would be beneficial for the study of nano-resonators with very high-quality factors, such as nano-membranes and nano-rods.

Published
2012

4. Evaluation of transverse elastic properties of fibers used in composite materials by laser resonant ultrasound spectroscopy

Author

Mounier , Denis, Poilâne , Christophe, Bûcher , Cécile, Picart , Pascal, Laboratoire de recherche sur les propriétés des matériaux nouveaux (LRPMN), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU), Laboratoire d'Acoustique de l'Université du Mans (LAUM), Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM), Société Française d'Acoustique, Laboratoire de recherche sur les propriétés des matériaux nouveaux ( LRPMN ), Université de Caen Normandie ( UNICAEN ), Normandie Université ( NU ) -Normandie Université ( NU ), Laboratoire d'acoustique de l'université du Mans ( LAUM ), Le Mans Université ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), and System, HAL

Subjects
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], [SPI.ACOU] Engineering Sciences [physics]/Acoustics [physics.class-ph], [ SPI.ACOU ] Engineering Sciences [physics]/Acoustics [physics.class-ph], laser ultrasonics, composite materials, vibration modes, Physics::Optics, Resonant ultrasound spectroscopy
Abstract

International audience; We evaluate the elastic properties of glass, carbon, and flax fibers that are used to manufacture composite materials. The transverse elastic properties of fibers are more difficult to measure than the longitudinal properties. But the knowledge of the transverse properties is mandatory to predict correctly the mechanical behavior of a composite material. We apply the laser resonant ultrasound spectroscopy (RUS) technique to evaluate the transverse Young modulus and Poisson ratio of fibers. The mechanical vibrations of a cross section are generated by a pulsed subnanosecond laser beam focused and shaped on the fiber as a line parallel to the fiber. The vibrations are detected optically by the probe beam of an interferometer, focused at the zone of excitation. The measured eigenfrequencies range from 5 MHz for flax fibers to 500 MHz for carbon and glass fibers. Using finite element modeling, the eigenmodes of fibers are identified and the mechanical properties of the fiber materials are evaluated. The transverse elastic properties of carbon fibers are significantly different from the longitudinal properties. For flax fibers, the strong damping of modes which is observed could explain the strong damping of flax fiber reinforced polymers.

Published
2012

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