A5038836946- Scientific Measurement and Uncertainty Evaluation
- Mechanical and Optical Resonators
- Advanced Sensor Technologies Research
- Advanced Measurement and Metrology Techniques
- Force Microscopy Techniques and Applications
- Surface Roughness and Optical Measurements
- Spectroscopy and Laser Applications
- Radioactive Decay and Measurement Techniques
- Nuclear Physics and Applications
- Photonic and Optical Devices
- Advanced MEMS and NEMS Technologies
- Advanced Fiber Optic Sensors
- Seismic Waves and Analysis
- Analytical Chemistry and Sensors
- Geophysics and Sensor Technology
- Sensor Technology and Measurement Systems
- Magnetic and Electromagnetic Effects
- Atomic and Subatomic Physics Research
- Integrated Circuits and Semiconductor Failure Analysis
- Adhesion, Friction, and Surface Interactions
- Calibration and Measurement Techniques
- Particle accelerators and beam dynamics
- nanoparticles nucleation surface interactions
- Near-Field Optical Microscopy
- Advanced Surface Polishing Techniques
Conservatoire National des Arts et Métiers
2015-2025
In everyday life, the visual system is remarkably good at recognizing materials across a wide range of viewing conditions. This paper addresses problem identifying real samples from appearance. Here, we consider gloss as an appearance attribute that could reveal certain information about object properties. We prepared twelve glass and PMMA eroded these using different agents. The haze were measured 60 degrees via meter. For all samples, surface roughness properties measured. Microfacet...
This paper describes a quantum realization of the pascal based helium absolute refractometer at 532 nm. The short-term stability in pressure is ± 2 mPa with resolution this new optical standard better than 1 temperature about mK. A design presented to have and accurate measurements reach uncertainties current conventional methods.
This paper presents a preliminary study of an elementary device consisting small plate made from pyrolytic carbon levitated above magnet array which is sensitive to any irradiating laser power. might provide interesting alternative power meters based on thermal measurement techniques via the Stefan-Boltzmann law or photon-electron interaction. We show that photo-response in terms levitation height versus irradiation range 20 mW 1 W sufficiently linear, sensitive, and reproducible be used as...
Recent demands for infrasound measurement, whether detecting violent atmospheric events or evaluating the environmental impact of wind farms, require new acoustic calibration standards in frequency range below 2Hz. Expanding bandwidth microphones remains a limited strategy since they are designed to filter out continuous components. An alternative method measuring is proposed, which relies on Fabry-Perot interferometer. This technique has been studied extensively static pressure measurements...
In 2000, the Bureau National de Métrologie (BNM, France) decided to develop a new watt balance experiment. Among numerous design studies, choice of transfer mass is particularly important. Because proximity source high magnetic intensity, this must have susceptibility as weak possible. Gold–platinum alloy seems meet requirement, well additional requirements for density and hardness values, making it possible candidate standard realization. Five different gold–platinum alloys were studied,...
In the European Joint Research Project 'Multidimensional Reflectometry for Industry', a new gloss scale was developed with aim to represent different levels of gloss, hue, roughness, and refractive indices. this paper, surfaces six selected samples were thoroughly investigated using various measuring techniques in order verify outcome novel manufacturing processes terms distinct as well types surface roughness. The evaluation capture structures wavelength intervals utilizing confocal...
This paper describes an alternative of pressure measurements based on a helium absolute refractometer at 532 nm. The Fabry-Perot cavity has been characterized from relevant parameters and the resolution in this new optical sensor is lower than 0.2 Pa.
This article presents a device for the study of physisorbed elements on polished surfaces (diameter ⩽56 mm) kind used in mass metrology. The technique is based spectrometry molecules desorbed after heating under vacuum analyzed surface. We describe first application to current and future standards order understand how their surface reactivity depends storage conditions, cleaning processes, polishing methods. Surface contamination analysis by thermal desorption examine effect pure iridium...
Machining the surface of mass standards is still great importance. This paper details a comparative study roughness two plane surfaces platinum–iridium alloy (90% platinum and 10% iridium). Using BIPM processes, were initially machined on lathe using diamond tools; in addition, one these was manually polished with paste. Three techniques for characterization are used: shear-force microscopy (ShFM), optical roughness-meter x-ray reflectometer. The first technique uses interaction between...
We present a set-up using piece of pyrolytic carbon (PyC) to measure laser power in the range from few milliwatts watts. The experimental configuration consists measuring magnetic repulsion force acting between PyC placed on weighing pan and induction generated by magnet array fixed position above sheet. This involves which is expressed terms mass balance display. quantities affecting measurement results have been identified. An example metrological characterization accuracy, linearity...
The 18SIB04 QuantumPascal EMPIR project aims for development of photon-based standards that can replace primary the SI unit pressure, Pascal. In this project, four partners simulated pressure-induced deformation a given Fabry-Pérot cavity, using various versions two types software, COMSOL Multiphysics (R) and ANSYS Workbench. It was demonstrated that, geometry set material parameters, simulations could be performed by with such small discrepancies methodological mistakes simulation...
Dans le cadre du projet de recherche portant sur l'analyse l'activité surface appliquée aux besoins la métrologie caractérisation à l'échelle nanométrique et technologique, nombreuses améliorations adaptations ont été entreprises les dispositifs d'analyse laboratoire.Cet article se propose présenter un état des lieux ces en décrivant principales apportées au cours quatre dernières années résultats expérimentaux qui découlent.
This article describes an instrument for the measurement of mirage effect as a tool to determine molar adsorption per unit surface area Y1 condensable solvents in presence non-condensable carrier gas. The present apparatus is much improved version previous prototypes developed our laboratory and elsewhere with higher bake-out temperature (150 °C rather than 40 °C), lower residual vacuum (3 Pa versus 100 Pa), greater sample (40 mm diameter instead 10 mm), more powerful optical pump beam W cf....
The value of the Planck constant h was determined in 2014 by means LNE watt balance experiment. relative standard uncertainty 31 parts 108. This first determination performed air with a 500 g mass made from XSH Alacrite. main components associated involve calibration, stability, buoyancy correction and magnetic interaction correction. combined due to is 7.2 use 2016 platinum iridium alloy significantly reduces component arising for measurement either or under vacuum. this contribution...
We present the status of single-cavity Fabry-Perot interferometer developed at LNE-Cnam laboratory used for thermodynamic pressure measurements within range 100 Pa to kPa.After characterizing intrinsic parameters refractometer, this optical sensor is measure refractivity nitrogen.Then, using Lorentz-Lorenz equation and knowing refractive virial coefficients 532 nm, it possible deduce its density.Measuring temperature gas makes determine an state.Once stability inside have been achieved...
Fabry–Pérot-based refractometry has demonstrated the ability to assess gas pressure with high accuracy and been prophesized be able realize SI unit for pressure, pascal, based on quantum calculations of molar polarizabilities gases. So far, technology mostly limited well-controlled laboratories. However, recently, an easy-to-use transportable refractometer constructed. Although its performance previously assessed under laboratory conditions, serve as actually system, a ring-type comparison...
This paper presents some current or potential applications in metrology based on the diamagnetism of pyrolytic carbon (PyC). The magnetic repulsion force acting between a piece PyC subjected to flux can be used as spring either control position sensitive sensor element detect changes physical quantity measured. first part this provides examples briefly described devices for measuring mechanical quantities. There are two main configurations levitation: one, acceleration inclination instance,...
En 2018, la Conférence Générale des Poids et Mesures (CGPM) actera certainement nouvelle définition de l'unité masse en se basant, non plus sur un artéfact matériel mais une constante physique fondamentale.C'est pourquoi, il est indispensable repenser dès aujourd'hui l'échelle actuelle développant nouveaux moyens « pratiques » dissémination ce nouveau kilogramme ».Par conséquent, cet article décrit quelques études réalisées dans le cadre du projet européen NewKILO pour réalisation étalons...