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Steel characteristics measurement system using Barkhausen jump sum rate and magnetic field intensity and method of using same

United States Patent

5,619,135
April 8, 1997
View the Complete Patent at the US Patent & Trademark Office
A steel hardness measurement system and method of using same are provided for measuring at least one mechanical or magnetic characteristic of a ferromagnetic sample as a function of at least one magnetic characteristic of the sample. A magnetic field generator subjects the sample to a variable external magnetic field. The magnetic field intensity of the magnetic field generated by the magnetic field generating means is measured and a signal sensor is provided for measuring Barkhausen signals from the sample when the sample is subjected to the external magnetic field. A signal processing unit calculates a jump sum rate first moment as a function of the Barkhausen signals measured by the signal sensor and the magnetic field intensity, and for determining the at least one mechanical or magnetic characteristic as a function of the jump sum rate first moment.
Kohn; Gabriel (Omer, IL), Hicho; George (Derwood, MD), Swartzendruber; Lydon (New Carrollton, MD)
American Iron and Steel Institute (Washington, DC)
08/ 503,263
July 17, 1995
This invention was made with Government support under Contract No. DE-FC07-93ID13205 awarded by the Department of Energy. The Government has certain rights in this invention.