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Phase-based sensing system

  • US 6,489,917 B2
  • Filed: 11/06/2001
  • Issued: 12/03/2002
  • Est. Priority Date: 11/30/2000
  • Status: Expired due to Term
First Claim
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1. A sensing and measurement method, comprising the steps of:

  • transmitting a reference signal at an object;

    measuring the amplitude of the reference signal at two detectors, wherein the two detectors are offset in phase;

    measuring the amplitude of a reflected signal at the two detectors;

    mathematically relating the change in amplitude between the reference signal and the reflected signal at the two detectors to a change in phase, wherein the change in phase results from the relative motion of the object; and

    mathematically relating the change in phase with the relative motion of the object, such that an object displacement measurement is provided with sub-wavelength resolution.

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