A5008375181- Calibration and Measurement Techniques
- Scientific Measurement and Uncertainty Evaluation
- Advanced Sensor Technologies Research
- Diamond and Carbon-based Materials Research
- Atmospheric Ozone and Climate
- Phase Equilibria and Thermodynamics
- Field-Flow Fractionation Techniques
- Carbon Nanotubes in Composites
- Semiconductor materials and devices
- Chemical Thermodynamics and Molecular Structure
- Advanced Thermodynamic Systems and Engines
- High-pressure geophysics and materials
- Electronic and Structural Properties of Oxides
- Material Dynamics and Properties
- Sensor Technology and Measurement Systems
- Advanced Thermodynamics and Statistical Mechanics
- Plant Water Relations and Carbon Dynamics
- Heat Transfer and Boiling Studies
- Atmospheric and Environmental Gas Dynamics
- Advanced Fiber Laser Technologies
- Advanced MEMS and NEMS Technologies
- Gas Sensing Nanomaterials and Sensors
- Analytical chemistry methods development
- Spectroscopy and Laser Applications
- Catalytic Processes in Materials Science
National Institute of Metrology
2007-2024
We review the principles, techniques and results from primary acoustic gas thermometry (AGT). Since establishment of ITS-90, International Temperature Scale 1990, spherical quasi-spherical cavity resonators have been used to realize AGT in temperature range 7 K 552 K. Throughout sub-range 90 < T 384 K, at least two laboratories measured (T − T90). (Here is thermodynamic T90 on ITS-90.) With a minor exception, resulting values T90) are mutually consistent within 3 × 10−6 T. These measurements...
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....
Diamond samples of defects with negatively charged nitrogen-vacancy (NV) centers are promising solid-state spin sensors suitable for quantum information processing and highly sensitive measurements magnetic, electric, thermal fields at the nanoscale. A diamond defect an NV center is unique its robust temperature-dependent zero-field splitting Dgs triplet ground state. This property enables optical readout electron states through manipulation state using microwave resonance from 100 K to...
The determination of the differences (T – T 90) between thermodynamic temperature and international scale 1990 (ITS-90) 90, is important for an evaluation approximation to by 90. Such evaluations are necessary potential revision ITS-90. A number efforts have been devoted acoustic gas thermometry (AGT) using spherical or quasi-spherical resonators. We report in this paper a new study range from 234 K 303 AGT with cylindrical resonator. Piezo-electric transducers were used measure resonant...
Currently, there exists only one set of experimental results at temperatures up to 680 K with the claimed relative standard uncertainty (0.15–0.20)%. This paper reports new using two-capillary viscometer in temperature range from 298.15 653.15 0.062%. The measurements agree existing high accuracy and ab initio calculations overlapping within extraordinary low differences ±0.08%. good agreement represents a robust proof potential models derived calculations, which play powerful means...
Abstract The nitrogen-vacancy (NV) centre in diamond is regarded as a promising micro-nano scale thermometer due to its high stability, good temperature resolution and scope for integration. relation between the zero-field splitting parameter ( D ) T fundamental applications. In this work, an optical system that uses continuous-wave optically detected magnetic resonance technique measurement of D-T was built. measured by home-made thermostatic two calibrated platinum resistance thermometers...
Abstract The action of the Minamata Convention requests in near term to develop alternative fixed points replace mercury triple point (Hg TP) from set defining International Temperature Scale (ITS) 1990. Carbon dioxide (CO 2 ) TP is a candidate that exhibits advantages high chemical and physical stability low health risk, disadvantage relatively pressure at room temperature. We report our study on realization CO using long-stem standard platinum resistance thermometers (SPRTs). present novel...
A typical solid-state quantum sensor can be developed based on negatively charged nitrogen-vacancy (NV−) centers in diamond. The electron spin state of NV− controlled and read at room temperature. Through optical detection magnetic resonance (ODMR) technology, temperature measurement achieved the nanoscale. key to ODMR technology is apply microwave manipulate NV−. Therefore, field characteristics formed near have a crucial impact sensitivity measurement. This article mainly focuses situation...
We review recent determinations of the Boltzmann constant kB and differences T − T90 that used cylindrical acoustic gas thermometry (c-AGT). These measured resonance frequencies argon enclosed by metal-walled, cavities. (Here, is thermodynamic temperature on International Temperature Scale 1990, ITS-90.) In range 234–303 K, standard uncertainty c-AGT ranges from 1.9 × 10−6T to 2.6 10−6T. This much smaller than errors in ITS-90; therefore, can help improve ITS-90. Moreover, we are extending...
Relative primary acoustic gas thermometry (AGT) determines the ratios of thermodynamic temperatures from measured and microwave resonance frequencies in a gas-filled metal cavity on isotherms interest. When with known dimensions, resonances determine speed sound, which is function temperature T. Changes dimensions are using cavity's resonances. We explored techniques materials for AGT at high cylindrical remote transducers. used ducts as waveguides to transmit sound between transducers room...
des établissements d'enseignement et de recherche français ou étrangers, laboratoires publics privés.
Abstract The zero field splitting (ZFS) quantifies the energy difference for ground electron spin-triplet of a negatively charged nitrogen-vacancy center in absence external fields diamond sample. ZFS is key parameter using NV centers as quantum sensors probes magnetic and electric fields, temperatures strains. generally detected coherent spin manipulation by sweeping microwaves (MWs) at frequencies close to resonance with ZFS. In this article, we report our experimental observations...
The mercury triple point (Hg TP), one of the defining points international temperature scale 1990 (ITS-90), has distinguishing role for reducing Type 1 and 3 nonuniqueness with subrange between argon (Ar TP) water (TPW). However, is highly toxic will be banned from global commercial trade by action Minamata Convention on Mercury. xenon (Xe carbon dioxide (CO2 sulfur hexafluoride (SF6 are candidates replacement Hg TP. We presented in this study our analytical investigation propagation...