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Apparatus and method for determining the position and motion of an object and for precise measurement of phase-related values

  • US 6,373,235 B1
  • Filed: 05/03/2000
  • Issued: 04/16/2002
  • Est. Priority Date: 05/04/1999
  • Status: Active Grant
First Claim
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1. Measurement apparatus comprising:

  • means for providing first and second signals of constant frequency and phase;

    means for producing a phase shift in said first signal proportional to a phenomenon, property, or condition to be measured;

    means for combining said phase-shifted first signal with said second signal to extract a third signal at a difference-frequency between the first and second signals; and

    phaselocked loop means for producing an output signal phaselocked to said third signal, wherein phase changes in said third signal produce phase changes in said phaselocked loop output signal that are substantially greater than corresponding phase changes in said third signal.

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