COMPREHENSIVE ANALYSIS OF BARKHAUSEN EMISSION-SPECTRA USING PULSE-HEIGHT ANALYSIS, FREQUENCY-SPECTRUM, AND PULSE-WAVE FORM ANALYSIS

The dependence of magnetic Barkhausen emissions (MBE) upon both field excitation and detection frequencies and excitation wave form was stud ied in order to investigate two of several crucial factors which affec t the emissions. Sinusoidal, triangular, and square wave forms were us ed to generate the MBE and the pulse height spectra, frequency spectra , and pulse wave forms of these signals were analyzed. The frequency s pectra of sinusoidal and triangular alternating field excitations show ed similar behavior but the spectrum under square wave excitation was different due to the existence of high frequency components during squ are wave switching. As yet, no common standard has been agreed upon fo r parameterization and representation of Barkhausen signals. It appear s from this work that field excitation wave form and frequency should define the inputs, while detection frequency range, pulse height spect rum, frequency spectrum, and emitted pulse wave form analysis should b e used to quantify the output.