Method and apparatus for measuring magnetic losses in ferromagne

Details Method and apparatus for measuring magnetic losses in ferromagne Method and apparatus for measuring magnetic losses in ferromagne

1987-12-28

1989-04-11

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Hysteresis or eddy current loss testing

324226, 324260, 374 45, G01R 3314, G01N 2772, H04L 2710

Patent

active

048209813

ABSTRACT:
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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"Photothermal spectroscopy using optical beam probing:Mirage effect", J. C. Murphy et al, Journal of Applied Physics, pp. 4580-4588, vol. 51 (1980).

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