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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

*** EXPIRED ***
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.