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Noncontact distance-measuring system having at least one coil and method of noncontact distance measuring operating either on the basis of eddy currents or by inductance

  • US 5,629,619 A
  • Filed: 10/31/1994
  • Issued: 05/13/1997
  • Est. Priority Date: 08/06/1992
  • Status: Expired due to Term
First Claim
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1. Noncontact distance measuring system comprising a sensor (2) which includes a measuring coil (1), an electronic supply/evaluation circuit (3), connected to the measuring coil and including means for supplying an alternating current to the coil, and an electrically and/or magnetically conductive test object (4) associated to the sensor (2), the measuring coil (1) being packaged in a coil housing (5), and the test object (4) surrounding the coil housing (5) at least in part and being movable in its longitudinal direction,characterized in that the test object (4) is constructed as a ring (6) surrounding the coil housing (5) at a distance therefrom, that the measuring coil (1) is provided with at least two voltage taps (7), so that voltage values of the voltage taps can be tapped one after the other, each between the individual voltage tap (7) and a reference potential, and that the electronic supply/evaluation circuit (3) comprises an electronic component (10) for processing a summation of the tapped voltages to produce a total voltage which is correlated with the position of the test object (4).

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