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View Paper |
Session Topic: 10A, Reference Materials |
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Paper Title: The Use and Calibration of Magnetometers for Measuring Magnetic Properties |
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Date & Time: THURSDAY, August 8, 2002 |
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10:30am - 12:10n - PARALLEL SESSIONS - SESSION 10 |
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Speaker: Michael Hall
National Physical Laboratory |
Email: michael.hall@npl.co.uk |
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Magnetic quantities have derived units and their traceable measurement presents a considerable challenge. When material properties are listed for trade requirements, the end user will need to compare the manufacturers specifications. To do this with global confidence the magnetics industry requires standards in the form of written documents and reference materials. Written standards provide the technical detail required to establish the measurement technique. However, the commercial measurement solutions available are not sufficiently transparent to allow compliance with these standards to be easily established. Reference materials are therefore necessary. With the requirement for magnetic measurements being dispersed across many industries there is also demand for magnetic characterisation as a service so that the individual industries do not have to maintain expensive and complex systems. A magnetic quantity frequently measured by commercial systems is the magnetic moment. From this the required material properties are determined by applying geometrical corrections. Because magnetic moment is the product of magnetization and volume, the range to be covered is considerable. The magnetometers available for measuring magnetic moment specialise on a limited part of this range. To provide comprehensive traceability a system is being established that is capable of measuring magnetic moments from 10-9 Am2 to 20 Am2. The measurement technique used provides the necessary flexibility and transparency. The details of the method will be presented and calibration issues relating to the measurement discussed. The determination of the required material properties will be presented. This includes the use of a novel magnetic material with specially engineered properties. |
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