A5043139870- Adaptive optics and wavefront sensing
- Astronomy and Astrophysical Research
- Structural Response to Dynamic Loads
- Stellar, planetary, and galactic studies
- Optical measurement and interference techniques
- Structural Analysis and Optimization
- High-Velocity Impact and Material Behavior
- Astronomical Observations and Instrumentation
- Advanced optical system design
- Galaxies: Formation, Evolution, Phenomena
- Radio Astronomy Observations and Technology
- Solar and Space Plasma Dynamics
- Image Processing Techniques and Applications
- Scientific Research and Discoveries
- Spaceflight effects on biology
- Structural Behavior of Reinforced Concrete
- Advanced X-ray and CT Imaging
- 3D Printing in Biomedical Research
- Combustion and Detonation Processes
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Radio, Podcasts, and Digital Media
- Probabilistic and Robust Engineering Design
- Advanced Surface Polishing Techniques
- Ultrasonics and Acoustic Wave Propagation
Centre National de la Recherche Scientifique
2008-2023
Laboratoire Navier
2023
Université Gustave Eiffel
2023
University of Southampton
2018-2021
Observatoire de Haute-Provence
2008-2018
Aix-Marseille Université
2014-2018
Université d'Orléans
2016
Institut Pytheas
2016
Laboratoire Pluridisciplinaire de Recherche en Ingénierie des Systèmes, Mécanique et Energétique
2012-2016
Institut National des Sciences Appliquées Centre Val de Loire
2016
SOPHIE is a new fiber-fed echelle spectrograph in operation since October 2006 at the 1.93-m telescope of Observatoire de Haute-Provence. Benefiting from experience acquired on HARPS (3.6-m ESO), was designed to obtain accurate radial velocities (~3 m/s over several months) with much higher optical throughput than ELODIE (by factor 10). These enhanced capabilities have actually been achieved and proved invaluable asteroseismology exoplanetology. We present here concept, double-pass Schmidt...
The problem of dynamic buckling thin cylindrical tanks subjected to an external blast caused by accidental gaseous detonation is studied in this paper. A study performed on flexible cylinders at a reduced scale quantify the structural response. Simplified semi-analytical models based Donnell's equations and critical imperfection amplification thresholds are used provide damage predictions. Numerical results compared experimental ones which shows qualitative good agreement. Finally,...
The Dark Energy Spectroscopic Instrument (DESI) is under construction to measure the expansion history of Universe using Baryon Acoustic Oscillation technique. spectra 35 million galaxies and quasars over 14000 deg² will be measured during life experiment. A new prime focus corrector for KPNO Mayall telescope deliver light 5000 fiber optic positioners. fibers in turn feed ten broad-band spectrographs. consortium Aix-Marseille University (AMU) CNRS laboratories (LAM, OHP CPPM) together with...
Studies are under way to propose a new generation of post-VLTI interferometers. The Carlina concept studied at the Haute- Provence Observatory is one proposed solutions. It consists in an optical interferometer configured like diluted version Arecibo radio telescope: above primary mirror made fixed cospherical segments, helium balloon (or cables suspended between two mountains), carries gondola containing focal optics. Since 2003, we have been building technical demonstrator this telescope....
Context. The performance of interferometers has largely been increased over the last ten years. But number observable objects is still limited due to low sensitivity and imaging capability current facilities. Studies have done propose a new generation interferometers. Aims. Carlina concept studied at Haute-Provence Observatory consists in an optical interferometer configured as diluted version Arecibo radio telescope: above primary mirror made fixed co-spherical segments, helium balloon or...
The modal parameters of structures, and in particular their mode shapes, are generally determined based on the measurement accelerometers or laser vibrometers. However, these sensors do not allow performance full-field measurements. In this study, free vibration a beam triggered by shock is investigated using high-speed camera with high image definition. With help digital correlation (DIC), displacement fields deduced from images. To analyse DIC quality, different tests analyses performed....
The Dark Energy Spectroscopic Instrument (DESI) is under construction to measure the expansion history of Universe using Baryon Acoustic Oscillation probe. KPNO Mayall telescope will deliver light 5000 fibers feeding ten broadband spectrographs. A consortium Aix-Marseille University (AMU) and CNRS laboratories (LAM, OHP CPPM) together with WINLIGHT Systems company (Pertuis-France) has committed integrate validate performance requirements full spectrographs, equipped their cryostats, shutters...
The recently commissioned Dark Energy Spectroscopic Instrument (DESI) will measure the expansion history of Universe using Baryon Acoustic Oscillation technique. spectra 35 million galaxies and quasars over 14000 sqdeg be measured during life experiment. A new prime focus corrector for KPNO Mayall telescope delivers light to 5000 fiber optic positioners. fibers in turn feed ten broad-band spectrographs. consortium Aix-Marseille University (AMU) CNRS laboratories (LAM, OHP CPPM) together with...
ELP-OA ('Etoile Laser Polychromatique pour l'Optique Adaptative) aims at demonstrating the tip-tilt is measurable with a Guide Star (LGS) without any natural guide star. This allows full sky coverage down to visible wavelengths. being setup Observatoire de Haute-Provence (OHP). To create polychromatic LGS, we use two pulsed dye lasers (at 569nm and 589nm) produce two-photons excitation of sodium atoms in mesosphere. The chromatism refractive index air yields difference LGS direction...
We have built at the Haute-Provence observatory (France) rst diluted telescope in world. describe this prototype called Carlina, made of three 25 cm mirrors separated by a maximum baseline 10.5 m. The place are already coherenced and light is scheduled for June-July 2012. In article, we will mainly focal gondola. propose to build near future 100 m aperture Large Diluted Telescope. This be more sensitive than regular interferometers (Keck, VLTI, etc.), with higher imaging capabilities. A LDT...
We report the status of ELP-OA (Etoile Laser polychromatique pour l'Optique Adaptative), full demonstrator which we are building at OHP 1.52m telescope. The goal is to open adaptive optics domain visible wavelengths large telescopes, almost not feasible today because tiny isoplanatic patch. relies on 2-photon excitation sodium in mesosphere, through 589 and 569 nm transitions. use 2 pulsed dye lasers (on loan from CEA) pumped with NdYAGs. average power mesosphere will be × 22W. twin laser...
Bone cement is widely used for the fixation of orthopaedic implants. It a multi-component material that consists PMMA base with small proportion (usually ceramic) radiopacifier to enable be observed by X-ray. formed through an exothermic reaction in which powder pre-polymerised beads reacts MMA monomer. The resulting polymer microstructure matrix newly containing particles. In service, bone can experience deformation over range strain rates, from lower end normal gait 100s s -1 case falls or...