Extension de la dissémination de l’unité de masse entre 1 mg et 100 μg

Madec, T.; Mann, George; Meury, Paul-André; Khélifa, N.

doi:10.1051/rfm/2011011

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…The calibration uncertainty of the working mass standards made from stainless steel will be slightly increased by the component due to the buoyancy correction. If the density of air in the mass comparator were determined by means of density artefacts, the differential buoyancy correction of about 95 mg would be determined with a standard uncertainty of about 1 µg [52][53][54]. Finally, the working kilograms made of stainless steel will be calibrated with a standard uncertainty of better than 5.5 parts in 10 8 as shown in table 6.…”

Section: Reference Mass Made From Pt-10%ir Alloymentioning

confidence: 99%

Present and future mass standards for the LNE watt balance and the future dissemination of the mass unit in France

Pinot¹,

Beaudoux²,

Bentouati³

et al. 2016

Metrologia

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The value of the Planck constant h was determined in 2014 by means of the LNE watt balance experiment. The relative standard uncertainty was 31 parts in 10 8 . This first determination was performed in air with a 500 g mass standard made from XSH Alacrite. The main uncertainty components in air associated with the mass involve the calibration, the mass stability, the buoyancy correction and the magnetic interaction correction. The combined relative uncertainty due to the mass is 7.2 parts in 10 8 . The use in 2016 of a mass standard made from platinum iridium alloy significantly reduces the component of uncertainty arising from the mass standard for a Planck constant measurement either in air or under vacuum. The relative uncertainty due to this contribution is estimated to be about 3 parts in 10 8 in air and one part in 10 8 under vacuum. The future system for the dissemination of the mass unit using the LNE watt balance will be based on a primary realization with three 500 g mass standards made from platinum-iridium alloy, pure iridium and Udimet 720 respectively, coupled with a pool of kilograms made from different materials. Pure iridium and Udimet 720 are new materials to make reference mass standards proposed by CNAM and LNE respectively and have never been used by any NMI for manufacturing mass standards until now. Some new results concerning their surface behavior are given.

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Section: Reference Mass Made From Pt-10%ir Alloymentioning

confidence: 99%

Present and future mass standards for the LNE watt balance and the future dissemination of the mass unit in France

Pinot¹,

Beaudoux²,

Bentouati³

et al. 2016

Metrologia

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“…Recent advances in nanotechnology have created new opportunities for masses smaller than this. Recently, the French laboratory LNE/Cnam has produced a new series of mass standards and extended the possibility for mass calibration ranging from 100 µg to 900 µg [1]. In practice, low-force measurements based on deadweights can be extended to about 5 µN (approximately 0.5 mg).…”

Section: Introductionmentioning

confidence: 99%

Small-Force Measurement by Photo-Elastic Transducer

Khélifa

2014

OPJ

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The use of stress-induced changes in a crystal of a monolithic solid-state laser by external force as a way for micro-force detection and measurement is described. In fact, the application of an unknown force on the resonator-amplifier crystal of a solid-state laser leads to a measurable change in the frequency of the beat note associated with the orthogonal polarisation components of the oscillating laser mode. Here we report our first measurements of the sensitivity of a photo-elastic force sensor, realised with a monolithic (4 × 4) mm plano-convex cylindrical crystal, and compare them with the results obtained by other authors for different configurations and dimensions of the laser sensor. The reported results are in a good mutual agreement but show notable discrepancies with theoretical predictions, especially for high sensitivities obtained when the dimensions of the laser sensor are small.

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“…Measurements of small forces (micro and nano-Newton levels) are increasingly being embraced in various disciplines [1], such as nano/bio-mechanical testing and medicine [2] [3]. In realizing these small forces, most National Metrology Institutes (NMIs) use mass artifacts (of 0.5 mg) to generate a force of 5×10 -6 N [4] [5] [6]. However, at the moment, such results have no measurement assurance since traceability to the International System of Units (SI) has not yet been developed [7].…”

Section: Introductionmentioning

confidence: 99%

Calibration of Weights and Weight Sets Based on Micro-Mass Standard Measurement System

Ren¹,

Wang²,

Zhang³

et al. 2014

KEM

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The growing and evolving dynamics in mass and force measurements has inevitably necessitated the need for high precision and accurate results. As a result, measurements in micro-gram (s) and nanoNewtons levels have increasingly attracted potential research interests. In an effort to develop such solutions, the National Institute of Metrology (NIM) has set up a new robot system CCR10 (readability 0.1μg) for accurate measurements of weight (s) ( 1 mg). This system is based on computer controls and linear-drive trains, and is used for calibration/verification of weight (s) below 10 g. A detailed description of the robots metrological parameters and calibration results thereof is presented in the current paper. Keywords: Micro Weights; nanoForce; Automatic Mass Comparator; Robot System; Calibration

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Extension de la dissémination de l’unité de masse entre 1 mg et 100 μg

Cited by 6 publications

References 3 publications

Present and future mass standards for the LNE watt balance and the future dissemination of the mass unit in France

Present and future mass standards for the LNE watt balance and the future dissemination of the mass unit in France

Small-Force Measurement by Photo-Elastic Transducer

Calibration of Weights and Weight Sets Based on Micro-Mass Standard Measurement System

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