Minimization of the coil movement of the LNE watt balance during weighing mode and estimation of parasitic forces and torques involved

Thomas, Matthieu; Espel, Patrick; Briand, Yves; Genevès, G.; Bielsa, Franck; Pinot, P.; Juncar, P.; Piquemal, F.

doi:10.1088/0026-1394/51/2/s54

Cited by 18 publications

(14 citation statements)

References 17 publications

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“…The shear motions are measures of the horizontal forces on the coil, the tilt motions are measures of the torque. In the LNE Kibble balance [ 129 ] and later the NRC Kibble balance, the coil is suspended from vertically-separated, double gimbals. The angular excursions of the upper gimbals is exclusively given by the horizontal forces on the coil, the excursions of the lower gimbals by a combination of the horizontal forces and the torques on the coil.…”

Section: Design and Operation Of Kibble Balancesmentioning

confidence: 99%

“…The angular excursions of the upper gimbals is exclusively given by the horizontal forces on the coil, the excursions of the lower gimbals by a combination of the horizontal forces and the torques on the coil. By measuring four quantities (two in each of the direction x and y ) the forces and torques can be inferred [ 129 ]. Typically, the angles of the lower gimbals and the horizontal displacements of the coil are measured.…”

Section: Design and Operation Of Kibble Balancesmentioning

confidence: 99%

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The watt or Kibble balance: a technique for implementing the new SI definition of the unit of mass

2016

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The redefinition of the SI unit of mass in terms of a fixed value of the Planck constant has been made possible by the Kibble balance, previously known as the watt balance. Once the new definition has been adopted, the Kibble balance technique will permit the realisation of the mass unit over a range from milligrams to kilograms. We describe the theory underlying the Kibble balance and practical techniques required to construct such an instrument to relate a macroscopic physical mass to the Planck constant with an uncertainty, which is achievable at present, in the region of 2 parts in 10 8 . A number of Kibble balances have either been built or are under construction and we compare the principal features of these balances.

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Section: Design and Operation Of Kibble Balancesmentioning

confidence: 99%

Section: Design and Operation Of Kibble Balancesmentioning

confidence: 99%

The watt or Kibble balance: a technique for implementing the new SI definition of the unit of mass

2016

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“…Comparison experiment showed that CAG agreed with FG5 in several part in 10 9 [68] with better short term stability [69]. The LNE watt balance is under development, e.g., alignment [70], and the Planck constant measurement may report as early as in 2015.…”

Section: Lne Watt Balancementioning

confidence: 68%

Progress on accurate measurement of the Planck constant: watt balance and counting atoms

Li,

Zhang,

Zhao

et al. 2014

Preprint

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The Planck constant h is one of the most significant constants in quantum physics. Recently, the precision measurement of the numeral value of h has been a hot issue due to its important role in establishment for both a new SI and a revised fundamental physical constant system. Up to date, two approaches, the watt balance and counting atoms, have been employed to determine the Planck constant at a level of several parts in 10 8 . In this paper, the principle and progress on precision measurement of the Planck constant using watt balance and counting atoms at national metrology institutes are reviewed. Further improvements for the Planck constant determination and possible developments of a revised physical constant system in future are discussed.

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“…where the five terms in bracket (later called residual watt ratios) must be reduced to a minimum. As described in [20], these parasitic forces can be evaluated with a model of the suspension and by measuring the angular variations and the lateral displacements of the upper and lower part of the suspension during both phases of the experiment. The minimization of the residual terms consist in minimizing the lateral forces and the torques.…”

Section: Alignmentmentioning

confidence: 99%

First realisation of the kilogram with the METAS Kibble balance

Eichenberger¹,

Baumann²,

Mortara³

et al. 2022

Metrologia

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After several years of development and continuous improvement, the Kibble balance at the Federal Institute of Metrology (METAS) is now operational. Its stability and reliability allows high precision measurements to be performed under vacuum. Two measurement campaigns were conducted in 2021 with 1 kg stainless steel test masses. The results differ from the value deduced from the calibration following the dissemination process after the redefinition of the kilogram by 6 µg with a total standard uncertainty of 43 µg (k=1). This paper presents the details of this first result with its associated uncertainty budget.

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Minimization of the coil movement of the LNE watt balance during weighing mode and estimation of parasitic forces and torques involved

Cited by 18 publications

References 17 publications

The watt or Kibble balance: a technique for implementing the new SI definition of the unit of mass

The watt or Kibble balance: a technique for implementing the new SI definition of the unit of mass

Progress on accurate measurement of the Planck constant: watt balance and counting atoms

First realisation of the kilogram with the METAS Kibble balance

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