In this paper, a new method for analysing the magnetic Barkhausen noise (MBN) measurements is presented. The proposed method analyses the power spectrum evolution with magnetising time of the MBN signal. The presented tool combines frequency and time domain information, avoiding the problems derived from the non-stationarity of the MBN signal, present in traditional frequency spectrum analysis. The results obtained with the proposed method have a simple representation, similar to the root mean square (RMS) curves. Therefore, it allows a straightforward comparison of signals obtained with different samples. The tool is also simple to use, flexible and configurable, and it can be adapted to various analysis and applications. As an example, the results obtained by the application of the method in a study of the influence of the quantisation of the magnetising signal on the MBN measurements are presented, and compared to the traditional RMS values. The information provided by the proposed method when applied to the whole power spectral density bandwidth is equivalent to the one given by the RMS values. However, when the method is applied to different frequency bands of the signal, it is capable of providing complementary information.
展开▼
