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Magnetic Barkhausen Noise Analysis for Inspection of Ferromagnetic Materials

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.



SAE, 2019, SAE ARP4462B: Barkhausen Noise Inspection for Detecting Grinding Burns in High Strength Steel Parts, SAE International, Warrendale, PA.

Send, S., D. Dapprich, J. Thomas, and L. Suominen, 2018, “Non-Destructive Case Depth Determination by Means of Low-Frequency Barkhausen Noise Measurements,” Journal of Nondestructive Evaluation, Vol. 37, Article No. 82,

Thomas, J., 2018, “Magnetic Barkhausen Noise for Nonde-structive Inspection of Gears,” in ASM Handbook, Vol. 17: Nondestructive Evaluation of Materials, ASM International, Materials Park, OH. 

Thomas, J., and S. Kendrish, 2019, “Magnetic Barkhausen Noise as an Alternative to Nital Etch for the Detection of Grind Temper on Gears,” Gear Solutions, January 2019, https:// 01/0119-Gearsolutions.pdf.

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