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A Static-Sample Magnetometer for Characterizing Weak Magnetic Materials

Arpaia, P ; Buzio, M. B. ; Parrella, A. ; Pentella, M. P. ; Ramos, P. M.

IEEE Transactions on Instrumentation and Measurement Vol. 70, Nº 6003309, pp. 1 - 9, April, 2021.

ISSN (print): 0018-9456
ISSN (online): 1557-9662

Scimago Journal Ranking: 0,82 (in 2020)

Digital Object Identifier: 10.1109/TIM.2020.3041823

In this paper, a static-sample magnetometer is presented to measure the relative permeability of weakly magnetic materials. The method consists of scanning the magnetic field inside a dipole magnet by using an NMR teslameter to measure the perturbation of a test specimen on the externally applied field. Then, an inverse problem is used to compute the specimen’s relative permeability. As a case study, the measurement of three different materials with different shapes and dimensions is carried out. The method was validated by measuring the same material by a vibrating sample magnetometry as proposed by the standard ASTM A342/A342M-14. The Monte Carlo evaluated expanded measurement uncertainty of the relative permeability is about 10*4 for all the cases, with a level of confidence of 95 %.