Electricity: measuring and testing – Magnetic – Magnetic field detection devices
Patent
1987-04-08
1988-11-15
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
Magnetic field detection devices
128429F, 307419, G01R 3300, H02M 510, A61N 100
Patent
active
047852445
ABSTRACT:
Devices such as, e.g., switches, flowmeters, and proximity sensors, as well as implant devices are made comprising an elongated ferromagnetic element. When the element is exposed to a variable magnetic field an electrical signal is obtained between contact points of the element in response to a change in the magnetic field. Preferred elongated elements have a helically deformed microduplex structure as may be produced by heat treatment and plastic twisting of a body of an alloy such as, e.g., an iron-nickel alloy.
REFERENCES:
patent: 3602906 (1971-08-01), Wiegand
patent: 3783880 (1974-11-01), Kraus
patent: 4251293 (1981-02-01), Jin
Jin Sung-ho
Sherwood Richard C.
Tiefel Thomas H.
van Dover Robert B.
American Telephone and Telegraph Company AT&T Bell Laboratories
Businger Peter A.
Eisenzopf Reinhard J.
Snow Walter E.
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