150 / 2019-02-28 16:34:46

Measurement Procedure For External Magnetic Field in UME Kibble Balance

Magnetism,Kibble Balance,Magnetism,Measurement Technique

全体主题 > Calibration, Metrology and Standards

The kilogram, currently defined by the mass of a material artifact, the International Prototype of the Kilogram, will be defined in terms of a fundamental nature of constant, the Planck constant, ensuring long-term stability of the SI mass unit and enabling traceability from more than one source. Kibble balance experiments offer an effective primary realization method for the kilogram based on the value of Planck constant. Kibble Balance apparatus operating at National Metrology Institute of Turkey is designed with a stationary coil and an oscillating magnet. In contradistinction to traditional moving coil Kibble balance experiments, external magnetic field brings an asymmetry between the Ampere’s law of force and the Faraday’s law of induction in moving magnet experiments. In this paper, we develop a method based on the external magnetic flux density difference measurements in vertical direction to take into account the effect of the external magnetic field on the realization of kilogram. The proposed model in this approach fits well with the data such that the kilogram realization requirement is met within the accuracy of the measuring instrument.