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Buried service detection

  • US 10,209,385 B2
  • Filed: 12/21/2015
  • Issued: 02/19/2019
  • Est. Priority Date: 10/03/2014
  • Status: Active Grant
First Claim
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1. A mobile detection device as a bucket of an earth moving machine for an evaluation of a distance value and/or proximity from the bucket to an occluded AC carrying structure by detecting a magnetic field emanated from the AC of the AC carrying structure, comprising:

  • at least one detection coil, comprising at least one winding of an electrically conductive material, connected toa first amplification stage connected to the coil,wherein the at least one detection coil and the first amplification stage are sealed within a common enclosure which is located at the bucket,wherein the first amplification stage is an amplifier circuit embodied as an electrical current sensing amplifier embodied as a transimpedance amplifier having a low input impedance, andwherein an output of the amplifier circuit is configured to link to an electronic signal evaluation unit for detecting the occluded structure according to an electrical signal induced in the detection coil by the magnetic field.

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