Veranstaltungen & Messen - vdma.org

Barkhausen Noise Analysis (BNA), also known as the magnetoelastic or micromagnetic method, is based on the principle of inductive measurements of a noise-like signal generated by magnetization of a ferromagnetic component. After the German scientist Professor Heinrich Barkhausen, who already explained the principle of this phenomenon in 1919, the signal is called Barkhausen noise. Many surface treatments, such as grinding, hard turning, case hardening, induction hardening and shot peening, cause considerable changes in the residual stress and microstructure of the edge zone, which can be characterised by Barkhausen noise. The main application of the Barkhausen process is the control of hard fine machining (testing for grinding burn). Processes such as creep and fatigue also change the residual stress and microstructure and can be analyzed using Barkhausen noise.

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