Authors:

Wade Gubbels

Publication:

Materials Evaluation, Volume 78, Issue 6

Publication Date: 1 June 2020Testing Method:

Acoustic Emission Testing

Barkhausen noise (BN) is the measurement and analysis of a noise-like signal generated when an alternating magnetic field is applied to a ferromagnetic material. The technique was initially discovered and investigated in the early part of the twentieth century. Advances in computer processing and the development of commercially available analyzers helped facilitate BN as a nondestructive technique for material characterization and the detection of thermal damage beginning in the early 1980s. BN has continually grown into a trusted technique for numerous applications, the most prevalent being the detection of grinding burn and heat treatment defects. The ability of the technique to detect changes in a material’s microstructure and stress state is established in both industrial testing specifications and scientific literature. Today, the technique is trusted across various industries for process optimization, quality control, and in-line monitoring.

DOI: doi.org/10.32548/2020.me-04132

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