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Multi-conductive ferromagnetic core, variable permeability field sensor and method

  • US 7,196,514 B2
  • Filed: 10/20/2004
  • Issued: 03/27/2007
  • Est. Priority Date: 01/15/2002
  • Status: Expired due to Fees
First Claim
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1. A magnetic field sensor, comprisinga magnetic sensing element comprising a plurality of parallel, lengthwise extending conductive cores that are ferromagnetic, connected in parallel;

  • a coil wound about said plurality of conductive cores;

    a source of electrical energy, providing alternating electrical energy to said conductive cores to establish an alternating magnetic field in said conductive cores, said magnetic field having a magnitude at which there is a linear relationship between said magnetic field and permeability of said magnetic sensing element;

    a circuit for detecting changes in voltage across said coil, resulting from changes in said permeability of said magnetic sensing element, attributable to an external magnetic field.

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