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Relative Permeability Measurements for Metal Detector Research

Published

Author(s)

Michael D. Janezic, James R. Baker-Jarvis

Abstract

We examine a measurement method for characterizing the low-frequency relative permeability of ferromagnetic metals commonly used in contraband materials. Besides the conductivity and geometry, the metal's relative permeability is another important variable in the detection of metal weapons. We describe a measurement method for measuring the relative permeability of metal toroid samples of rectangular cross section. Taking into account the finite conductivity of the metal and skin depth, we present a model for the inductance of a wound toroid, from which the permeability can be calculated. Relative permeability results are presented for ferritic and martensitic stainless steels as a function of frequency and magnetic field strength.
Citation
Technical Note (NIST TN) - 1532
Report Number
1532

Keywords

Conductivity, loss factor, magnetic response, metal detector, permeability.

Citation

Janezic, M. and Baker-Jarvis, J. (2021), Relative Permeability Measurements for Metal Detector Research, Technical Note (NIST TN), National Institute of Standards and Technology, Gaithersburg, MD (Accessed July 19, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created October 12, 2021