A5087620694- Calibration and Measurement Techniques
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Conservatoire National des Arts et Métiers
2014-2024
Istituto Nazionale di Ricerca Metrologica
2004-2021
Technical Institute of Physics and Chemistry
2020-2021
Chinese Academy of Sciences
2020-2021
Institute of Macromolecular Chemistry
2020
Instituto Nacional de Metrologia, Qualidade e Tecnologia
2013
National Research Council Canada
2013
Laboratoire National de Métrologie et d'Essais
2010
National Metrology Institute of the Republic of Moldova
2008
There is currently great interest in the international metrological community for new accurate determinations of Boltzmann constant k B, with prospect a definition unit thermodynamic temperature, kelvin. In fact, B relates energy (the joule) to temperature kelvin). One most ways access value from measurements velocity sound noble gas. method described here, experimental determination has been performed closed quasi-spherical cavity. To improve accuracy, all parameters experiment (purity gas,...
ABSTRACT The study describes significant outcomes of the ‘Metrology for Meteorology’ project, MeteoMet , which is an attempt to bridge meteorological and metrological communities. concept traceability, idea used in both fields but with a subtle difference meaning, at heart project. For meteorology, traceable measurement one that can be traced back particular instrument, time location. From perspective, traceability further implies primary realization quantity being measured terms base units...
The SI unit of temperature will soon be redefined in terms a fixed value the Boltzmann constant k derived from an ensemble measurements worldwide. We report on new determination using acoustic thermometry helium-4 gas 3 l volume quasi-spherical resonator. method is based accurate and microwave resonances to measure speed sound at different pressures. find for universal R = 8.314 4614(50) J·mol−1·K−1. Using current best available Avogadro constant, we obtain 1.380 648 78(83) × 10−23 J·K−1...
Launched in 2011 within the European Metrology Research Programme (EMRP) of EURAMET, joint research project "MeteoMet -Metrology for Meteorologyis
The International Committee for Weights and Measures (CIPM), at its meeting in October 2017, followed the recommendation of Consultative Units (CCU) on redefinition kilogram, ampere, kelvin mole. For kelvin, Boltzmann constant will be fixed with numerical value 1.380 649 × 10
In 2011, a working group of the Consultative Committee for Thermometry published their best estimates differences between thermodynamic temperature T and its approximation (T90), according to International Temperature Scale 1990, ITS-90. These consensus estimates, in combination with measurements made accordance ITS-90, are an important alternative primary thermometry those requiring accurate temperature. Since there has been change definition kelvin significant improvements thermometry....
The Boltzmann constant k has been determined from a measurement of the speed sound in helium gas quasi-spherical resonator (volume 0.5 l) maintained at temperature close to triple point water (273.16 K). acoustic velocity c is deduced measured resonance frequencies and dimensions quasi-sphere, latter being obtained via simultaneous microwave resonance. Values are extrapolated zero pressure limit ideal behaviour. We find J⋅K−1, result consistent with previous measurements our group elsewhere....
Main text This is a report to the Consultative Committee for Thermometry (CCT) on key comparison 9 of Standard Platinum Resistance Thermometer (SPRT) calibration International Temperature Scale 1990 (ITS-90) [1] from 83.8058 K (the Ar triple point) 692.677 Zn freezing point). The followed collapsed star protocol, with each fourteen participating laboratories shipping two standard platinum resistance thermometers (SPRTs) as transfer standards pilot laboratory (National Institute Standards and...
Abstract We describe measurements of thermodynamic temperature in the range 5 K to 24.5561 (the triple point neon) using single-pressure refractive-index gas thermometry (SPRIGT) with 4 He. In wake May 2019 re-definition kelvin and its associated mise en pratique , main purpose work is provide values T – 90 discrepancy between that International Temperature Scale 1990 (ITS-90). The link ITS-90 made via calibrated rhodium-iron resistance thermometers. Innovations required reach level accuracy...
Main text This is the final report of CCT-K7.2021 key comparison water-triple-point (TPW) cells. The primary objective was a participant national realizations TPW temperature. Each laboratory selected one its cells for use as transfer cell, directly compared it against reference and delivered to pilot (NRC). then all two NRC and, finally, each retrieved cell re-compared reference. initial measurements at laboratories were started in April 2021. participants' completed September 2022....
Previous research effort towards the determination of Boltzmann constant has significantly improved supporting theory and experimental practice several primary thermometry methods based on measurement a thermodynamic property macroscopic system at temperature triple point water. Presently, experiments are under way to demonstrate their accuracy in T over an extended range spanning interval between few kelvin copper freezing (1358 K). We discuss how these activities will improve link as...
We review measurements of the Boltzmann constant, k, value which is soon to be fixed at exactly 1.380649×10−23 J⋅K−1 for future revised Système international units. In addition a description theoretical background and diverse experimental techniques (acoustic thermometry, Johnson noise dielectric constant gas Doppler broadened molecular spectroscopy), article highlights decisive role ab initio calculations thermophysical properties gases, especially helium-4. Perspectives improvements in...
Abstract We used absolute primary acoustic gas thermometry (AGT) to calibrate a Pt–Co resistance thermometer on the thermodynamic temperature scale by measuring speed of sound in helium at T * chosen be near triple point neon, Ne . Prior present AGT, was with neon triple-point cell as part an interlaboratory comparison. Taken together, results comparison and AGT redetermined = (24.555 15 ± 0.000 24) K. This new value is consistent other recent determinations obtained various methods. After...
The paper reports a new experiment to determine the value of Boltzmann constant, , with relative standard uncertainty 1.2 parts in 10 6 . k B was deduced from measurements velocity sound argon, inside closed quasi-spherical cavity at temperature triple point water. shape achieved using an extremely accurate diamond turning process. traceability ensured highest level accuracy. volume resonator calculated resonance frequencies microwave modes. molar mass gas determined by chemical and isotopic...
Salinity is an essential quantity to calculate many of the physical properties oceans, but it also a hard define considering complexity this material in its bio-geo-chemical composition and imperfections existing measurement techniques. The TEOS-10 gives several definitions notion absolute salinity, usable function study, they are based on concept constant elemental seawater, so that, if major inorganic components well known, real varies time space determination still challenge.
Main text This is a report to the Technical Committee for Thermometry of EURAMET (EURAMET TC-T) on regional key comparison EURAMET.T-K9 SPRT calibration International Temperature Scale 1990 (ITS-90), from 83.8058 K (the Ar triple point) 692.677 Zn fixed point). The transfer standards used are long-stem SPRTs. an RMO linked CIPM CCT-K9. organized in five separate collapsed Stars, each one having CCT-K9 participant as pilot, which provides link KCRV Four participating laboratories involved...
The neon triple point is one of the defining fixed points International Temperature Scale 1990 (ITS-90). Although recognizing that natural a mixture isotopes, ITS-90 definition only states should be 'natural isotopic composition', without any further requirements. A preliminary study in 2005 indicated most observed variability realized temperatures within range about 0.5 mK can attributed to composition among different samples 'natural' neon. Based on results an Project (EUROMET No. 770),...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation F. Pavese, P. M. Steur, Y. Hermier, K. D. Hill, J. S. Kim, L. Lipiński, Nagao, T. Nakano, A. Peruzzi, Sparasci, Szmyrka-Grzebyk, O. Tamura, W. Tew, Valkiers, van Geel; Dependence of the triple point temperature neon on isotopic composition its implications for ITS-90. AIP Conference Proceedings 11 September...
The International System of Units (SI) is to be redefined with implementation set on World Metrology Day (20th May 2019). Under the auspices Consultative Committee Thermometry (CCT) world thermometry community has been working together ensure a smooth and effective redefinition kelvin. A large part that activity coordinated through European Programme for Innovation Research: "Implementing new kelvin" projects. This paper describes InK2 project contribution.