An alternative method to remove excitation field interference from magnetic Barkhause noise

Abstract

A simple method of measuring the magnetic Barkhausen noise (MBN) in two stages was tested. The purpose of the proposed method is to remove the excitation field interference from the induced electromotive force (EMF) signal without complex adjusting analog or digital filters before the measurement. In this method, two consecutive waveforms of the EMF signal were temporarily recorded, and then they were subtracted from each other in a software. Using this method we will obtain only the stochastic component of the EMF signal–MBN. The most common parameters of the MBN obtained by this method were studied. The experiments proved that with this method we are able to remove the dominant interference from the EMF signal in a wide excitation frequency range and thus we can simplify the measurement. Moreover, we found that the two-stage method is able to remove the interference signal without significant deterioration of the MBN even at the highest excitation frequency investigated, in contrast to the classical one-stage method.