Magnetic marker

Details Magnetic marker Magnetic marker

1995-11-01

1997-07-22

Zimmerman, John

Stock material or miscellaneous articles

All metal or with adjacent metals

Having magnetic properties, or preformed fiber orientation...

428900, 428928, 340551, 340572, G08B 1324

Patent

active

056502362

ABSTRACT:
A magnetic marker of the present invention includes a magnetic thin wire for generating pulses and bodies of soft magnetic materials that are arranged close to the two ends of the thin wire that have a smaller coercive force than the magnetic thin wire. The magnetic thin wire has a diameter of 60-115 .mu.m and has a ratio of B.sub.r /B.sub.s of a B-H loop of 0.8 or more. Thus, a small magnetic marker can be formed which provides a large Barkhausen effect even if it contains a very short magnetic thin wire.

REFERENCES:
patent: 4652863 (1987-03-01), Hultman
patent: 5130698 (1992-07-01), Rauscher
patent: 5181020 (1993-01-01), Furukawa et al.
patent: 5181021 (1993-01-01), Kelly et al.
patent: 5519379 (1996-05-01), Ho et al.
patent: 5538803 (1996-07-01), Gambino et al.
Patent Abstracts of Japan, vol. 16, No. 525 (P-1446), 28 Oct. 1992.
Patent Abstracts of Japan, vol. 11, No. 117 (E-498), 11 Apr. 1987.

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