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Method for determining position of an internal, movable conductive element

  • US 5,523,682 A
  • Filed: 08/17/1992
  • Issued: 06/04/1996
  • Est. Priority Date: 04/20/1990
  • Status: Expired due to Fees
First Claim
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1. A method for detecting the position of an element movably enclosed in a housing, comprising the steps of:

  • transmitting energy from a first transmitter located outside the housing through the housing to the element within the housing such that the transmitted energy is perturbed by impingement upon the element, the perturbation of the energy varying with varying position of the element within the housing;

    detecting energy transmitted by the first energy transmitter with a detector, the first transmitter energy detected by the detector including an unperturbed component and a superimposed, perturbed component from the element;

    transmitting energy detectable by the detector from a second transmitter separate from the first transmitter; and

    adjusting the energy being transmitted by at least one of the first and second transmitters to at least partially cancel the unperturbed component of the first transmitter energy being detected by the detector with the second transmitter energy being detected by the detector.

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