Canadian Patents and Development Limited/societe Canadienne Des Brevets

Jean F Bussiere

Jean-Pierre Monchalin

Martin Lord

The invention is concerned with a method and apparatus for measuring magnetic losses in a ferromagnetic material specimen. According to the invention, an alternating magnetic field having a predetermined frequency and an amplitude which is modulated at a frequency lower than the predetermined frequency is applied to the specimen, and a temperature modulation at a surface of the specimen having the applied field is measured. The magnitude of magnetic losses in the specimen is determined from the measured surface temperature modulation. The method and apparatus of the invention do not necessitate winding coils around the ferromagnetic material specimen, and also enable one to obtain information about the distribution of magnetic losses in the specimen.

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St-Bruno, Canada

Jean F Bussiere