Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1998-03-06
2000-07-04
Strecker, Gerard
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324209, 324239, 324240, G01N 2772, G01N 2782, G01R 3312
Patent
active
060844043
ABSTRACT:
Apparatus and method for measuring the Barkhausen signal of a moving magnetic film, ribbon or fiber wherein first and second stationary electromagnet coils are arranged and separated by a distance, d, along the path of movement of the film, ribbon or fiber. The first and second coils are energized in a manner to generate first and second opposing DC magnetic fields through which the moving film, ribbon or fiber passes along its path of movement. As the film, ribbon or fiber moves through the first and second opposing magnetic fields at a velocity, v, it experiences one complete cycle of magnetization in a period of time equal to d/v. A stationary third signal pick-up coil is disposed between the first and second coils to detect the Barkhausen signal from the moving film, ribbon or fiber. The pick-up coil typically is disposed midway between the first and second coils where the Barkhausen signal will be approximately maximum.
REFERENCES:
patent: 2065119 (1936-12-01), Davis, Jr.
patent: 4827215 (1989-05-01), van der Walt
patent: 5619135 (1997-04-01), Kohn et al.
Kivimaa, et al; "Influence of Tensile Stress in Steel Cables on Magnetic Barkhausen Noise", IEEE Transactions on Magnetics 29, No. 6 Nov. 1993.
Review of Magnetic Methods for Nondestructive Evaluation; NDT International, vol. 21, No. 5, Oct., 1988, pp. 311-319; D.C. Jiles.
Jiles David C.
Parakka Anthony
Iowa State University & Research Foundation, Inc.
Strecker Gerard
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