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Non-contact position sensor and method

  • US 20020097042A1
  • Filed: 01/10/2002
  • Published: 07/25/2002
  • Est. Priority Date: 01/24/2001
  • Status: Active Grant
First Claim
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1. A non-contact position sensor system comprising at least one primary drive coil disposed on a generally planar surface, the drive coil having an input, at least one differential secondary sense coil disposed on a generally planar surface in magnetic field receiving relationship with the drive coil, the sense coil having an output, a drive circuit connected to the input of the drive coil for providing a large di/dt pulse creating a magnetic field and a detection circuit connected to output of the sense coil for detecting positive and negative pulses in the sense coil providing a digital output, and a generally planar target having an electrically conductive portion movable over the sense coil within the magnetic field of the drive coil.

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