A new adaptive automated feedback system for Barkhausen signal measurement

This paper describes a new Barkhausen signal measurement system that has recently been developed for use with soft magnetic materials. The key feature of this system is that it uses an automated digital feedback technique capable of fully controlling flux density waveforms. The system is capable of controlling the flux density waveforms not only under sinusoidal conditions, but also under triangular, trapezoidal, and even arbitrary conditions at flux densities of up to 1.7 T. Measurements have been made at magnetizing frequencies 25–75 Hz, and Barkhausen effect signals were detected over the frequency range 3.5–100 kHz.