INFLUENCE OF MAGNETIZING FREQUENCY AND MEASURED DATA PROCESSING ON BARKHAUSEN NOISE PARAMETERS OF

Jozef Paľa - Jan Bydžovský

   In this paper we investigated the influence of the magnetizing frequency on the determination of the Barkhausen noise (BN) parameters for the correlation with material properties (grain size) of non-oriented FeSi steel. Measurement results showed that changing frequency of the magnetizing field significantly influences the measured signal from the sensor picking up the BN. Increasing frequency causes the rise of the low frequency electromotive force (EMF) signal which mixes with the BN and thus influences the measurement accuracy. At highest investigated frequency of 10 Hz the EMF signal is so high that it is problematic to remove it without affecting the BN. We studied also the effect of different types of sensors on the BN and the low frequency EMF signal.

Keywords: Barkhausen noise, magnetizing frequency, grain size, FeSi steel

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