Barkhausen Noise Analysis (BNA)
Barkhausen noise analysis (BNA) also referred to as the micromagnetic method is based on a concept of inductive measurement of a noise-like signal, generated when a magnetic field is applied to a ferromagnetic sample.
The nature of Barkhausen noise was explained already in 1919 by Prof. Heinrich Barkhausen. However, the method drew the attention for industrial applications in the beginning of 1980s by Dr. Seppo Tiitto and Dr. Kirsti Tiitto who are also the founder of Stresstech. Today, it is a recognized non-destructive method for materials characterization and heat treatment defect testing.