Apparatus and method for measuring magnetic fields
AssigneeRobert Bosch GmbH
InventorsFrank Schatz, Paul Farber, Stefan Weiss, Gerhard Lammel, Fouad Bennini
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Abstract
An apparatus for measuring a magnetic field is described, which comprises a core and an exciter coil for remagnetizing the core material. The remagnetizable core material is embodied as a layer or as multiple layers disposed at a distance from one another, and the core has a maximum total extension G where 2.5 mm≧G≧0.2 mm, a ratio of length to width that is greater than or equal to a value of twenty, and a thickness D where 2 μm≧D≧0.2 μm. Also described is a corresponding method for measuring a magnetic field.
Claims15
An apparatus for measuring a magnetic field, comprising:
- a core including a remagnetizable core material and an exciter coil for remagnetizing the remagnetizable core material, wherein:
- the remagnetizable core material includes multiple layers of the remagnetizable core material disposed at a distance from one another;
- a ratio of length to width of the core is greater than or equal to a value of twenty;
- a thickness of the core is D;
- 2 μm≧D≧0.2 μm;
- a thickness of each individual one of the layers is DS;
- and
- 60 nm≧DS≧20 nm.
A microelectromechanical system, comprising:
- an apparatus for measuring a magnetic field, the apparatus comprising a core that includes a remagnetizable core material and an exciter coil for remagnetizing the remagnetizable core material, wherein:
- the remagnetizable core material includes multiple layers of the remagnetizable core material disposed at a distance from one another;
- a ratio of length to width of the core is greater than or equal to a value of twenty;
- a thickness of the core is D;
- 2 μm≧D≧0.2 μm;
- a thickness of each individual one of the layers is DS;
- and
- 60 nm≧DS≧20 nm.
A method for measuring a magnetic field using an apparatus that includes a core, wherein the core includes a remagnetizable core material and an exciter coil for remagnetizing the remagnetizable core material, the remagnetizable core material includes multiple layers of the remagnetizable core material disposed at a distance from one another, a ratio of length to width of the core is greater than or equal to a value of twenty, a thickness of the core is D, 2 μm≧D≧0.2 μm, a thickness of each individual one of the layers is DS, and 60 nm≧DS≧20 nm, the method comprising:
- providing an alternating current flowing through the exciter coil for a periodic remagnetization of the remagnetizable core material accompanied by formation of a periodically changing magnetic field;
- superimposing a magnetic field to be measured and the magnetic field of the exciter coil;
- and
- deducing the magnetic field to be measured from a time shift of a remagnetization of the remagnetizable core material with respect to a zero crossing of the alternating current.
Dependencies are inferred from the claim text.