Method and apparatus for measuring magnetic losses in ferromagnetic materials based on temperature modulation measurements

An apparatus for measuring magnetic losses in a ferromagnetic material specimen, which comprises:

• magnetizing means for generating an alternating magnetic field having a predetermined frequency and an amplitude which is modulated at a frequency lower than said predetermined frequency, and applying said magnetic field to the ferromagnetic material specimen to thereby cause in said specimen a modulation in temperature at the frequency of modulation of said magnetic field, and
• temperature sensing means for measuring the temperature modulation at a surface of said specimen having the applied field, at the frequency of modulation of said magnetic field to obtain a measurement value which is substantially proportional to the magnitude of magnetic losses,
• whereby the magnitude of magnetic losses in the specimen is determined from said measurement value.