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2. Permanent magnets
2.1 Context
A natural approach to measuring the characteristics of permanent magnets is to determine the magnetic moment of a sample through the force arising from its interaction with a field of known topology.
If we plunge a magnet, of magnetic moment m, shaped like a needle on a pivot or suspended from a wire, into a uniform magnetic field H, it takes on an orientation that results from balancing the torque moment τ = m × μ 0 H applied by the field with the opposite torque applied by a spring or the twisting wire. By letting the sample oscillate, we have a pendulum whose resonant frequency is directly related to m and the pendulum's moment of inertia. If the sample is...
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Permanent magnets
Traceability and uncertainty of magnetic measurements
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Bibliography
Events
Magnetic Measurements, biannual conference, Liptovsky' Slovakia 2006, Budapest Hungary 2008, International workshop on 1 and 2D magnetic measurements and testing, biannual conference, Cardiff UK 2008, Oita Japan 2010
Standards and norms
- Methods of measurement of the magnetic properties of electrical steel sheet and strip by means of an Epstein frame (IEC Central Office) - IEC Standard Publication 60404-2 - 1996
- Methods of measurement of magnetic properties magnetic sheet and strip by means of a single sheet tester (IEC Central Office) - IEC Standard Publication 60404-3 - 1988
- Methods of measurement of the dc magnetic properties of magnetically...
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EURAMET European Association of National Metrology Institutes (successor to EUROMET since July 2007) http://www.euramet.org/
BIMP Bureau International des Poids et Mesures http://www.bipm.org/fr/home/
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