A5026277587- Scientific Measurement and Uncertainty Evaluation
- Spectroscopy and Laser Applications
- Radioactive Decay and Measurement Techniques
- Advanced Sensor Technologies Research
- Atomic and Subatomic Physics Research
- Advanced Electrical Measurement Techniques
- Particle Detector Development and Performance
- Laser Design and Applications
- Sensor Technology and Measurement Systems
- Advanced MRI Techniques and Applications
- Advanced Measurement and Metrology Techniques
- Atomic and Molecular Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Geophysics and Sensor Technology
- Atmospheric Ozone and Climate
- Advanced Fiber Laser Technologies
- Particle accelerators and beam dynamics
- Photorefractive and Nonlinear Optics
- Atmospheric and Environmental Gas Dynamics
- Mechanical and Optical Resonators
- Solid State Laser Technologies
- Nonlinear Dynamics and Pattern Formation
- Magneto-Optical Properties and Applications
- Dark Matter and Cosmic Phenomena
- Non-Destructive Testing Techniques
Bureau international des poids et mesures
2008-2024
Laboratoire National de Métrologie et d'Essais
2010-2014
Conservatoire National des Arts et Métiers
2011
Centre National de la Recherche Scientifique
2005-2010
Université Joseph Fourier
2009-2010
Laboratoire National des Champs Magnétiques Intenses
2008-2009
Université Toulouse III - Paul Sabatier
2005-2009
Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes
2005-2009
Laboratoire Collisions Agrégats Réactivité
2005-2009
Laboratoire Amiénois de Mathématique Fondamentale et Appliquée
2007-2008
Main text This report describes the second CCM key comparison of realizations kilogram definition based on fixed numerical value Planck constant, which came into force 20 May 2019. The objectives were to determine level agreement between using Kibble and joule balances x-ray crystal density (XRCD) method provide input for calculation "consensus value" kilogram. consensus serves as basis an internationally coordinated dissemination is updated after each new comparison. Its use will continue...
The Kibble balance is expected to become an important instrument in the near future for realizing unit of mass, kilogram, revised international system units (SI). assumes equality two magnetic profiles measured weighing and velocity phases. A recent study conducted group at Bureau International des Poids et Mesures (BIPM) showed that coil current could significantly affect profile, which should be carefully taken into account experiment. This paper gives a deeper understanding investigation...
This report describes the first CCM key comparison of realizations kilogram definition based on fixed numerical value Planck constant, which came into force 20 May 2019. The objectives were to determine level agreement between using Kibble and joule balances X-ray crystal density (XRCD) method provide input for calculation "consensus value" kilogram. consensus will serve as basis an internationally coordinated dissemination continue until sufficient realization experiments has been achieved....
We present the computation of two-photon transition spectra between rovibrational states $\text{H}_{2}{}^{+}$ molecular ion, including effects hyperfine structure and excitation polarization. The reduced matrix elements are obtained by means a variational method. discuss implications our results for high-resolution spectroscopy $\text{H}_{2}{}^{+}$.
We report the operation of a 50 mW continuous-wave quantum cascade laser (QCL) in 9.2 microm range, phase locked to single-mode CO(2) with tunable frequency offset. The wide free-running emission spectrum QCL (3-5 MHz) is strongly narrowed down kilohertz making it suitable for high-resolution molecular spectroscopy.
The magnet is one of the fundamental elements in Kibble balances. balance group at Bureau International des Poids et Mesures (BIPM) proposed a permanent with radial field, which has been widely employed other experiments. In this paper, we discuss different method operation for BIPM-type magnet, i.e. only lower half magnetic circuit closed. merit such its convenience opening air gap and adjusting coil. A disadvantage that it can yield sloped field profile less shielding. approach described,...
Since beginning the construction early in 2005, considerable progress has been made on watt balance of Bureau International des Poids et Mesures (BIPM). We have continued development a room-temperature version to test feasibility simultaneous force and velocity measurements. Preliminary measurements voltage-velocity ratio carried out with reproducibility order 1 part 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sup> . The coil...
The International Bureau of Weights and Measures (BIPM) is developing a watt balance for the forthcoming redefinition kilogram. An improved version apparatus, based on new closed magnetic circuit now being assembled. apparatus will significantly reduce type B uncertainty due to misalignment as this work demonstrates. We present two techniques recently developed accurately align field perpendicular direction defined by local acceleration gravity. Uncertainty below 30 μrad was achieved both...
Alignments of watt balance experiments are necessary to achieve a relative uncertainty at level few parts in 108. This paper briefly describes the LNE and concentrates on adjustments made minimize coil movements during weighing mode. The parasitic forces torques involved these estimated by mathematical model. Some calculated compared with an evaluation done studying yaw movement beam.
Type-I phase matching for second-harmonic generation at 10.6 μm in LiGaTe2 is demonstrated by using a tunable single-frequency continuous-wave CO2 laser, and the nonlinear coefficient of determined from comparison with AgGaSe2. The effective nonlinearity this process amounts to 34.5 pm/V.
This paper reports the latest advances made on BIPM watt balance experiment. The improved apparatus is now fully assembled. new, open support structure allows convenient access to all key components of apparatus. This, together with alignment mechanism will allow improve significantly accuracy. magnetic circuit was aligned better than 10 μrad an uncertainty 20 μrad. A new interferometer based space-heterodyning techniques has been integrated.
We report on our recent advances in the calculation of energy levels H + 2 molecular ion, including relativistic and radiative corrections. These theoretical efforts are linked to prospect obtaining a new determination proton electron mass ratio m p /m e through precise vibrational spectroscopy . describe setup experiment, aiming at measurement L = 2, υ 0 → 1 two-photon transition 9.166 μm using phase-locked quantum cascade laser as excitation source.PACS Nos.: 31.15.Pf, 31.30.Jv, 32.10.Hq
This paper reports the latest status of Kibble balance experiment that BIPM is developing for realization upcoming redefined mass unit. The apparatus now capable working with a 1 kg and fully operational in vacuum day-to-day repeatability at 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-7</sup> level. Studies are being conducted to evaluate various corrections such as those due coil-current effect self-attraction correction.
Yoke-based permanent magnetic circuits are widely used in Kibble balance experiments. In these systems, the coil current, with positive and negative signs two steps of weighing measurement, can cause an additional flux circuit, hence, a field change at position. The due to current related systematic effects have been studied assumption that yoke material does not contain any hysteresis. this article, we present explanation hysteresis error measurements. An evaluation technique based on...
This paper reports on the new 3-axis interferometer for velocity measurement BIPM watt balance. The frequency of a commercial Nd:YAG 532 nm laser has been stabilized to hyper fine transition in iodine by saturated absorption techniques. was first mounted, aligned and characterized separate test bench. whole experimental set-up then transferred balance laboratories. is at present being integrated inside apparatus.