Comparateur d'étalons de masse: une étude expérimentale des coefficients de corrélation des paramètres mesurés

Pinot, P.

doi:10.1088/0026-1394/28/2/004

Cited by 6 publications

(16 citation statements)

References 1 publication

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“…Consequently, it is necessary to clean them in order to obtain a mass value which is as stable and reproducible as possible. Many studies have been made of the influence of different cleaning methods on mass standards made from platinum-iridium, superalloys or stainless steels [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…A gravimetric study [17,18] of the effect of cleaning kilograms 07 and 09 with alcohols showed that this method caused a considerable short-term instability of mass.…”

Section: Introductionmentioning

confidence: 99%

“…These short-and medium-term instabilities are apparently due to the sorption of atmospheric gases and solvents. It is important to note that, once this period of instability has passed, the change in mass of [17,18]).…”

Section: Introductionmentioning

confidence: 99%

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Stability of XSH Alacrite mass standards: study of the effect of the BIPM cleaning/washing method

Pinot¹

1997

Metrologia

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A gravimetric study of the effect of cleaning XSH Alacrite standards with ethanol and isopropanol showed considerable short-term mass instability after this process, due primarily to the sorption of atmospheric gases and cleaning solvents. A new cleaning method was thus required. The first method investigated is that used currently by the Bureau International des Poids et Mesures (BIPM) for cleaning/washing iridium-platinum standards. Initial results of a gravimetric study and an X-ray photoelectron spectroscopy (XPS) analysis show that this method has a greater cleaning power than that using alcohols and that there is no short-term instability. It was nevertheless found that during the first year following this type of cleaning, the relative mass of the standard increased by about 5 × 10-9 and the reproducibility of the cleaning/washing procedure could not be ensured to better than 4 × 10-9.

show abstract

Section: Introductionmentioning

confidence: 99%

“…A gravimetric study [17,18] of the effect of cleaning kilograms 07 and 09 with alcohols showed that this method caused a considerable short-term instability of mass.…”

Section: Introductionmentioning

confidence: 99%

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Stability of XSH Alacrite mass standards: study of the effect of the BIPM cleaning/washing method

Pinot¹

1997

Metrologia

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“…A quaternary cobalt-based alloy provided by Aubert & Duval, Alacrite XSH, has also been studied at the LNE-INM (Institut National de Métrologie) for the realization of transfer mass standard [12,13]. The chemical composition of these cobalt-based alloys is reported in table 1.…”

Section: Materials Of the Studymentioning

confidence: 99%

Effect of the ambient atmosphere on the surface reactivity of materials for the realization of reference mass standards

Meury¹,

Huntz²,

Molins³

et al. 2007

Metrologia

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Secondary mass standards are usually made of stainless steel. One of the main problems in mass metrology is the stability of such stainless steel standards. Consequently, new materials have been investigated for the realization of mass standards, and this has led to the selection of nickel-based superalloys. The stability of materials is strongly dependent on surface reactivity; accelerated oxidation tests were performed, either in dry or wet air, and after a kinetic study, microstructural analysis of the oxide films was performed by scanning electron microscopy. The structure of the oxide films was also characterized by grazing x-ray diffraction and finally by x-ray photoelectron spectrometry (XPS) analysis. XPS associated with sputtering by argon ions allowed us to differentiate the nature of the oxides from the outer surface to a given depth in the film.

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“…Therefore, as the functional relationship of most of the quantities appearing in (4.13) to the "basic" quantities depends on the experimental method adopted, any further modelling in terms of these "basic" quantities would compromise generality (see e.g. [19] for a specific case). However, in order to gain a deeper understanding of the various contributory sources, we will now specialize (4.13) according to some of the methods most commonly adopted and discuss the properties of the various terms of (4.13).…”

Section: The Construction Of $Y In Its General Formmentioning

confidence: 99%

Uncertainty Modelling in Mass Comparisons

1994

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To evaluate uncertainty in mass measurements with accuracy and in accordance with recent international documents, a general model is developed, which takes account of the various contributing quantities in a multivariate context. On this basis, the variance-covariance matrix of the in-vacuo mass differences is constructed in its general form and tailored for application to some of the most commonly adopted weighing methods. The usual assumption of equal-variance, uncorrelated observations is shown to be inappropriate for mass comparisons.

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Comparateur d'étalons de masse: une étude expérimentale des coefficients de corrélation des paramètres mesurés

Cited by 6 publications

References 1 publication

Stability of XSH Alacrite mass standards: study of the effect of the BIPM cleaning/washing method

Stability of XSH Alacrite mass standards: study of the effect of the BIPM cleaning/washing method

Effect of the ambient atmosphere on the surface reactivity of materials for the realization of reference mass standards

Uncertainty Modelling in Mass Comparisons

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