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Hole displacement measuring system and method using a magnetic field

  • US 6,833,706 B2
  • Filed: 09/20/2002
  • Issued: 12/21/2004
  • Est. Priority Date: 04/01/2002
  • Status: Active Grant
First Claim
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1. An apparatus for measuring a radius of a hole, comprising:

  • a support member having at least one non-articulated arm, each at least one arm having a first end and a second end, the first end rigidly attached to the support member;

    a magnet moveably attached to the support member via the second end of each at least one arm;

    a first magnetic sensor fixed to the support member for measuring a magnetic field of the magnet;

    a second magnetic sensor fixed to the support member for measuring a magnetic field of the magnet; and

    a third magnetic sensor fixed to the support, such that it is substantially unaffected by the magnetic field of the magnet in its direction of sensing, for measuring a magnetic field not produced by the magnet to distinguish the influence on the first or second sensor due solely to the magnetic field of the magnet.

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