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Method and apparatus for detecting electric cables

  • US 5,929,624 A
  • Filed: 03/20/1995
  • Issued: 07/27/1999
  • Est. Priority Date: 03/23/1994
  • Status: Expired due to Term
First Claim
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1. A method of detecting the presence of an electric cable, the electric cable including armoring that is conductive and a conductive core that is electrically insulated from the armoring, the method comprising the steps of:

  • connecting the armoring to ground; and

    emitting a current pulse over the armoring by means of a current injector device connected to around so that the return for the pulse to the infector device takes place via ground,wherein the presence of the electric cable in the vicinity of a reception point is determined by detecting, at the point, a signal representative of the pulse, by means of a detector comprising a coil, wherein the coil is placed inside electrical screening constituted by aluminum foil.

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