Estimation of Uncertainties Caused by Elastic Deformations in a Superconducting Levitation System

It is now possible to obtain indirect values of the Avogadro constant NA having comparatively small combined standard uncertainties by appropriately combining the values of a number of other fundamental physical constants. These constants, whose values in several important cases can be obtained from electrical measurements, include the Rydberg, fine-structure, Josephson, von Klitzing, Planck, and Faraday constants, the molar mass of the proton, the proton-electron mass ratio, and the shielded proton gyromagnetic ratio. This paper gives the expressions that relate NA to these other fundamental constants and the values of NA that can be obtained from these expressions using the currently available data. It also briefly discusses the prospects of obtaining an indirect value of NA with a combined standard uncertainty that is small enough to allow the redefinition of the kilogram.

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Estimation of Uncertainties Caused by Elastic Deformations in a Superconducting Levitation System

Abstract: A method for estimation of the uncertainties caused by elastic deformations in a superconducting levitation electromechanical system is proposed. For the VNIIM system, with a monolithic supporting coil, these uncertainties are estimated to be 1 to 3 parts in lo8. 1990, 180-181.

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References 8 publications

Precisely measuring the Planck constant by electromechanical balances

Precisely measuring the Planck constant by electromechanical balances

Some Recommendations for the Designers of the Next Generation of Superconducting Magnetic Levitation Systems

Determining the Avogadro Constant from Electrical Measurements

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