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Passive and wireless displacement measuring device using parallel sensors

  • US 20040068205A1
  • Filed: 10/06/2003
  • Published: 04/08/2004
  • Est. Priority Date: 05/01/2000
  • Status: Abandoned Application
First Claim
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1. A system for a performing a remote measurement of the displacement between two adjacent objects, comprising:

  • a pair of sensors, each sensor having a magnetic rod and a sensor coil;

    wherein each sensor is operable to form a tuned circuit, and wherein the sensors have substantially the same resonant frequency;

    an interrogator having a transmit coil and at least one receive coil, transmit circuitry for delivering to the sensor coils an excitation signal through a range of frequencies, and receive circuitry for receiving a response signal from the sensor coils;

    wherein the interrogator is operable to detect a pair of peak frequencies from the sensors when the sensors are placed substantially parallel to each other in an environment where displacement is to be measured.

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