G - Physics – 01 – R
Patent
G - Physics
01
R
324/48
G01R 33/14 (2006.01) G01N 27/72 (2006.01) G01R 33/12 (2006.01) H04L 27/10 (2006.01)
Patent
CA 1268212
ABSTRACT The invention is concerned with a method and apparatus for measuring magnetic losses in ferromagnetic materials. 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 a ferromagnetic material specimen, to thereby cause in the specimen a modulation in temperature at the frequency of modulation of the magnetic field. The temperature modulation at a surface of the specimen having the applied field is then measured at the frequency of modulation of the magnetic field to obtain a measurement value which is substantially proportional to the magnitude of magnetic losses. The magnitude of magnetic losses in the specimen is determined from the measurement value. 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 distribu- tion of magnetic losses in the specimen.
526373
Bussiere Jean F.
Lord Martin
Monchalin Jean-Pierre
Bussiere Jean F.
Lord Martin
Monchalin Jean-Pierre
Swabey Ogilvy Renault
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