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The traceable measurement of magnetic dipole moment and the calibration of commercial magnetometers.

Hall, M; Bartholomew, J G; Harmon, S A C; Henderson, L C A (2001) The traceable measurement of magnetic dipole moment and the calibration of commercial magnetometers. In: BEMC 2001- 10th British Electromagnetic Measurement Conference, 6-8 November 2001, Harrogate, UK.

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Abstract

The measurement of the magnetic properties of materials is covered by the International Electrotechnical Committee 404 series of written standards. These standards mainly deal with the measurement of properties using closed magnetic circuits. Closed refers to the use of a magnetic yoke of high permeability to carry the flux of the test specimen from one end to the other. Commercial magnetometers are available that introduce air gaps since the specimen needs to be moved relative to detection coils. Here is an example of an open magnetic circuit. For this arrangement complex geometrical corrections are required. An important open circuit parameter is the magnetic dipole moment. In this paper the measurement of magnetic dipole moment is discussed. A method using Helmholtz coil will be presented which provides a measurement uncertainty of ±0.1%. Test specimens calibrated in this way can then be used to calibrate commercial magnetometers.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Keywords: magnetic dipole moment, commercial magnetometers
Subjects: Electromagnetics
Electromagnetics > Electromagnetic Materials
Last Modified: 02 Feb 2018 13:17
URI: http://eprintspublications.npl.co.uk/id/eprint/2174

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