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Inductive sensor tuning using a permeable paste mixture

  • US 10,395,811 B2
  • Filed: 05/18/2017
  • Issued: 08/27/2019
  • Est. Priority Date: 05/18/2017
  • Status: Expired due to Fees
First Claim
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1. An inductive sensor comprising:

  • an annular core body comprising a first end adjacent an active face of the sensor and a second end axially opposite the first end;

    a coil wound on the core body;

    a central axial cavity extending fully through the core body from the first end to the second end, the cavity having a height and a cross-sectional area that together define a fixed volume; and

    a tuning material situated within the cavity and extending axially from the first end through a subset of the height and occupying the entire cross-sectional area along the subset of the height such that it fills a controlled portion of the fixed volume ranging from twenty-five percent to two-thirds of the fixed volume;

    wherein the tuning material comprises a mixture of an epoxy material and at least one of a soft magnetic or paramagnetic material;

    wherein a coefficient of thermal expansion of the tuning material and the core body is the same; and

    wherein the controlled portion of the fixed volume filled with the tuning material controls an inductance of the sensor.

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