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Magnetic Rotation Sensing

  • US 20100072990A1
  • Filed: 09/25/2008
  • Published: 03/25/2010
  • Est. Priority Date: 09/25/2008
  • Status: Active Grant
First Claim
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1. A rotation sensing device, comprising:

  • a magnet apparatus comprising a first magnet and a second magnet, the magnet apparatus configured to be coupled to a dial apparatus of a meter;

    a first magnetic field sensor configured to be coupled to a dial cover, wherein when the first magnetic field sensor is coupled to the dial cover, a distance between the first magnet of the magnet apparatus and the first magnetic field sensor being a function of a magnetic field strength of the first magnet and a sensitivity of the first magnetic field sensor; and

    a second magnetic field sensor configured to be coupled to a dial cover, wherein when the second magnetic field sensor is coupled to the dial cover, a distance between the second magnetic field sensor and the first magnet being a function of the magnetic field strength of the first magnet and the sensitivity of the second magnetic field sensor, andwherein the first magnetic field sensor is configured to generate a first signal based upon the sensed magnetic field of the first magnet and the second magnetic field sensor is configured to generate a second signal based upon the sensed magnetic field of the first magnet.

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