Method and apparatus for detecting electric cables
First Claim
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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Abstract
A method of detecting the presence of an electric cable, the electric cable including conductive armoring and a conductive core that is electrically insulated from the armoring. In the method, the armoring is connected to ground, and a current pulse is emitted over the armoring by way of a current injector device connected to ground so that the return of the pulse to the injector device takes place via ground. The presence of the electric cable is detected in the proximity of a reception point by detecting, at the point, a signal that is representative of the pulse, by way of a detector.
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Citations
8 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Apparatus for detecting the presence of an electric cable, that is in service, said electric cable comprising conductive armoring and a conductive core that is electrically insulated from the armoring, wherein the apparatus includes a current injector device for emitting a current pulse over the armoring from an injection point, said current injector device being connected to ground such that the return for the current pulse to the injector device takes place via ground, and a detector for detecting at a reception point remote from the injection a signal representative of said pulse, wherein the detector includes a coil frame placed inside electrical screening constituted by aluminum foil.
Specification