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Position sensing device and method

  • US 7,609,055 B2
  • Filed: 07/21/2004
  • Issued: 10/27/2009
  • Est. Priority Date: 07/21/2004
  • Status: Active Grant
First Claim
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1. A sensing device comprising:

  • a first inductive sensor and a second inductive sensor;

    a body moveable relative to said sensors, said body comprising a material capable of altering a magnetic field, wherein the sensors and the body are disposed in the magnetic field, the first and second inductive sensors being offset with respect to each other along the path of movement of the body, said body further having a conical surface profile capable of causing a time dependent variation to the magnetic field when said body moves relative to said sensors, wherein the body profile includes at least two substantially conical profiles disposed along an axial length of the body;

    a substantially magnetically permeable envelope enclosing at least a portion of said body; and

    processing circuitry responsive to outputs of the sensors.

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