Errors due to magnetic effects in 1kg primary mass comparators

Davis, Richard; Coarasa, J

doi:10.1016/j.measurement.2006.02.002

Cited by 6 publications

(2 citation statements)

References 7 publications

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“…The vertical magnetic flux density, other than the Earth's, at the mass pan could be reduced to about 50 µT with a vertical gradient of about 1 mT m −1 , which is sufficiently low. For an estimation of the error forces exerted, one can use the approach shown in [15]. Another measure to increase the validity of the model and the stray flux problem is to design a closed magnet system.…”

Section: Discussion Of the Results And Methodsmentioning

confidence: 99%

A novel magnet system—which enables uniformity of radial flux density by means of a parabolic yoke—applied in the Planck-Balance

Konrad,

Rothleitner,

Fröhlich

2024

Meas. Sci. Technol.

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A uniform magnetic flux density that is effective in the movement range of the coil is essential for accurate Kibble balance experiments. By utilizing Hopkinson’s law and Kirchhoff’s circuit laws, basic formulas have been derived, providing a method to calculate the magnetic flux density distribution in the airgap of a cylindrical magnet system. A parabolic outer contour of the inner yoke has been found to be a suitable solution to achieve uniformity. Experiments show, that this approach results in a relative change of magnetic flux density in the order of 3 · 10−4 per 8mm movement range, using a magnet system with a mass of only 2.3 kg. Therefore, the system will be integrated into the upgraded version of PTB’s Planck-Balance – a compact variant of a Kibble balance – aiming for sub 1 · 10−6 accuracy level determination of the geometric factor. The solution described provides a comparatively easy means to design a cylindrical magnet system, using only one permanent magnet disc, without the use of complex simulation software.

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Section: Discussion Of the Results And Methodsmentioning

confidence: 99%

A novel magnet system—which enables uniformity of radial flux density by means of a parabolic yoke—applied in the Planck-Balance

Konrad,

Rothleitner,

Fröhlich

2024

Meas. Sci. Technol.

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“…Thus, for example, an OIML class E 2 10 g stainless steel mass placed on the KIBB-g1 mass pan would experience an additional force equivalent to a 12 mg mass due to the magnetic susceptibility of the material. This effect can be characterized by two magnetic force terms from [16]:…”

Section: Magneticmentioning

confidence: 99%

The performance of the KIBB-g1 tabletop Kibble balance at NIST

et al. 2020

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A tabletop-sized Kibble balance (KIBB-g1) designed to directly realize mass at the gram-level range with uncertainties on the order of parts in 10 6 has been developed at the National Institute of Standards and Technology (NIST). The masses of a nominally 5 g and 1 g weight were determined with 1-σ standard uncertainties of 9.0 µg and 6.7 µg, respectively. The corresponding relative uncertainties are 1.8 × 10 −6 and 6.3 × 10 −6 . The construction of the instrument, capabilities, and full uncertainty budgets are presented in this manuscript.

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A study of the permanent magnetization measurement of standard weights using Gaussmeter method according to OIML R111-1

Suebka¹,

Sanponpute²

2021

Measurement: Sensors

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Errors due to magnetic effects in 1kg primary mass comparators

Cited by 6 publications

References 7 publications

A novel magnet system—which enables uniformity of radial flux density by means of a parabolic yoke—applied in the Planck-Balance

A novel magnet system—which enables uniformity of radial flux density by means of a parabolic yoke—applied in the Planck-Balance

The performance of the KIBB-g1 tabletop Kibble balance at NIST

A study of the permanent magnetization measurement of standard weights using Gaussmeter method according to OIML R111-1

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