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Apparatus for determining gaps between a proximity probe and a conductive target material

  • US 6,954,062 B2
  • Filed: 05/30/2003
  • Issued: 10/11/2005
  • Est. Priority Date: 10/22/1999
  • Status: Expired due to Term
First Claim
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1. An apparatus for determining gaps between a proximity probe and a conductive target material, said apparatus comprising in combination:

  • a network including a first electrical component and said proximity probe serially connected;

    a signal generating means operatively coupled to said network for driving a current through said serial connection for establishing a first analog voltage signal across said network and a second analog voltage signal across said proximity probe;

    sampling means for digitizing said established voltage signals into digital voltage signals;

    a digital multiplier for multiplying each of said digital voltage signals by a digital sine signal and a digital cosine signal;

    means for accumulating values of each multiply in a memory, and means for processing each multiply for obtaining complex voltage representations correlative to gaps between said proximity probe and the conductive target material.

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