A5103138824- Geomagnetism and Paleomagnetism Studies
- Inertial Sensor and Navigation
- Magnetic Field Sensors Techniques
- Atomic and Subatomic Physics Research
- Geophysics and Gravity Measurements
- Ionosphere and magnetosphere dynamics
- Interconnection Networks and Systems
- VLSI and Analog Circuit Testing
- Low-power high-performance VLSI design
- Spacecraft Design and Technology
- Embedded Systems Design Techniques
- Earthquake Detection and Analysis
- Geophysical and Geoelectrical Methods
- Advanced Frequency and Time Standards
- Computational Fluid Dynamics and Aerodynamics
- Non-Invasive Vital Sign Monitoring
- Solar and Space Plasma Dynamics
- Computational Physics and Python Applications
- Nuclear Physics and Applications
- Optical Polarization and Ellipsometry
- Advancements in PLL and VCO Technologies
- Liquid Crystal Research Advancements
- Heart Rate Variability and Autonomic Control
- Marine and Coastal Research
- Geology and Paleoclimatology Research
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2007-2024
CEA LETI
2009-2024
Université Grenoble Alpes
2009-2024
Institut polytechnique de Grenoble
2009-2017
CEA Grenoble
2006-2017
Techniques of Informatics and Microelectronics for Integrated Systems Architecture
2017
Laboratoire d'Aérologie
1996
Centre National de la Recherche Scientifique
1996
The 12th generation of the International Geomagnetic Reference Field (IGRF) was adopted in December 2014 by Working Group V-MOD appointed Association Geomagnetism and Aeronomy (IAGA). It updates previous IGRF with a definitive main field model for epoch 2010.0, 2015.0, linear annual predictive secular variation 2015.0-2020.0. Here, we present equations defining model, provide spherical harmonic coefficients, maps magnetic declination, inclination, total intensity 2015.0 their predicted rates...
Optically-pumped magnetometers constitute a valuable tool for imaging biological magnetic signals without cryogenic cooling. Nowadays, numerous developments are being pursued using alkali-based magnetometers, which have demonstrated excellent sensitivities in the spin-exchange relaxation free (SERF) regime that requires heating to >100 °C. In contrast, metastable helium-4 based work at any temperature, allows direct contact with scalp, yielding larger and better patient comfort. However...
In this paper, we present a proof of concept study which demonstrates for the first time possibility recording magnetocardiography (MCG) signals with 4He vector optically pumped magnetometers (OPM) operated in gradiometer mode. Resulting from compromise between sensitivity, size and operability clinical environment, developed are based on parametric resonance helium zero magnetic field. Sensors at room temperature provide tri-axis measurement Measured sensitivity is around 210 f T (√Hz)-1...
The CEA-LETI has successfully designed and realized an optically pumped 4He magnetometer which provides absolute scalar magnetic field measurements with a 1 pT/√Hz resolution over DC to 100 Hz bandwidth. Its final corrected accuracy been demonstrated be better than 50 pT. ASM instrument is also able provide vector intrinsic nT/√Hz 0.4 All components have now qualified respect the environment performances specifications of SWARM mission different flight models are currently being manufactured...
Abstract The role of the Absolute Scalar Magnetometer (ASM) in European Space Agency (ESA) Swarm mission is to deliver absolute measurements magnetic field’s strength for science investigations and in-flight calibration Vector Field (VFM). However, ASM instrument can also simultaneously vector with no impact on magnetometer’s scalar performance, using a so-called mode. This mode has been continuously operated since beginning mission, except short periods time during commissioning. Since both...
Abstract European Space Agency's Swarm satellites carry a new generation of 4 He absolute magnetometers (ASM), designed by CEA‐Léti and developed in partnership with Centre National d'Études Spatiales. These instruments are the first ever spaceborne to use common sensor simultaneously deliver 1 Hz independent scalar vector readings magnetic field. Since launch, these ASMs provided very high‐accuracy field data, as nominally required for mission, together experimental data. Here we compare...
Low intrinsic noise, high bandwidth, and accuracy vector magnetometers are key components for many ground or space geophysical applications. Here, we report the design test of a 4He optically pumped magnetometer specifically dedicated to these needs. It is based on parametric resonance architecture operated in Earth magnetic field with closed-loop compensation three field. provides offset-free measurements ±70 μT range DC 1 kHz bandwidth. We demonstrate sensitivity up 130 fT/√Hz, which about...
Abstract Each of the three satellites European Space Agency Swarm mission carries an absolute scalar magnetometer (ASM) that provides nominal 1-Hz data for both science and calibration purposes. These ASM instruments, however, also deliver autonomous experimental vector data. Here, we report on how ASM-only from Alpha Bravo between November 29, 2013 (a week after launch) September 25, 2014 (for on-time delivery model October 1, 2014) could be used to build a very valuable candidate 2015.0...
The different factors that affect the SWARM optically pumped Absolute Scalar Magnetometer (ASM) accuracy are reviewed and analyzed. An overall precision of less than 45 pT (1 σ) is reported, which well under 300 specified for global ASM accuracy.
The Networks-on-Chip (NoCs) paradigm is emerging as a solution for the communication of SoCs. Many NoC architecture propositions are presented but few works on testing these network architectures. To test SoCs, main challenge to reach into embedded cores (i.e, IPs). In this case, DFT techniques that integrate architectures SoCs ease really favoured. paper, we present new methodology A modular, generic, scalable and configurable developed in order target asynchronous implemented GALS systems....
Asynchronous circuits are interesting alternatives for implementing ultra-low power systems but they more challenging to design. This work provides methods designers specify, verify, and implement self-timed pipelines. The connection of standard primitives allows specifying a control circuit. A method derive Petri net based model this circuit is presented. modeled transactions only those necessary at high level the verification performance analysis. Additionally, proposed framework includes...
<p>The geomagnetic field has been continuously monitored from low-Earth orbit (LEO) since 1999, complementing ground-based observatory data by providing calibrated scalar and vector measurements with global coverage. The successful three-satellite ESA Swarm constellation is expected to remain in operation up at least 2025. Further monitoring the space high-precision absolute magnetometry beyond that date of critical importance for improving our understanding dynamics multiple...
In order to improve the testability of asynchronous NoCs, we have developed a design-for-test (DfT) architecture. this architecture, each network node is surrounded by an test wrapper and communication channels are reused establish high throughput TAMs. A special block, generator-analyzer-controller (GAC) unit, has also been generate vectors, control flows, analyze results. This unit can be implemented on-chip or off-chip (in our experiments, it off-chip). The operation wrappers controlled...
Despite its advantages in terms of robustness, power consumption or even performances, asynchronous design struggles to take a significant place the industry. The required step by designers jump gap between synchronous and circuits remains too wide for moment. In order easily fullfil this gap, work uses an circuit class almost familar designers: micropipelines. proposed method make easy desynchronization is based on grouping registers that are inherently triggered together: Concurrently...
CEA-LETI and CNES have successfully realized a helium-4 isotropic space-qualified magnetometer for the SWARM mission. The present paper reviews progress made in miniaturization of this optically pumped magnetometer. Sensor isotropy is provided by liquid crystal polarization rotator that sets pumping beam at 90° with respect to ambient magnetic field. It allows continuous rotation from 0° more than 300° response times sufficient mobile or space applications. This non-magnetic can be easily...
Liquid Crystal Polarization Rotators (LCPRs) have been developed for the Miniaturized Absolute Magnetometer (MAM) instrument in NanoMagSat project, an ESA's SCOUT program mission. This project consists of a constellation three nanosatellites aimed to study Earth's magnetic and ionospheric environment based on 16U CubeSat-type structure. The MAM is optically pumped scalar vector magnetometer derived from ASM flown ESA Swarm In this type instruments, device rotate direction incident linear...
Thanks to many advantages, asynchronous circuits have been used solve the interconnect problems faced by system-on-chip (SoC) designers. Some networks-on-chip (NoCs) architectures are proposed for communication within SoCs, but lack methodology and support manufacturing test ensure these work correctly. We present an innovative DfT architecture that allows network architectures, as well synchronous computing resources asynchronous/synchronous interfaces on NoC-based SoCs. This is implemented...