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Dynamic magnetic locator and method for the same

  • US 7,164,270 B1
  • Filed: 12/19/2005
  • Issued: 01/16/2007
  • Est. Priority Date: 10/07/2005
  • Status: Expired due to Fees
First Claim
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1. A dynamic magnetic locator used for three-dimensional positioning, cross-line positioning and depth calculation of an underground metal pipe, the magnetic locator comprising:

  • a linking mechanism linked with a first sensor to horizontally move or rotate the first sensor;

    a second sensor horizontally arranged beside the first sensor;

    a third sensor vertically arranged on top of the second sensor; and

    a control module connected to the sensors and receiving magnetic signals of the underground metal pipe, which controls the linking mechanism to move or rotate the first sensor to obtain a plurality of magnetic signals, and processes the magnetic signals to obtain a position and depth of the underground metal pipe,wherein the control module comprises;

    a display showing the position and depth of the underground metal pipe;

    a keyboard used to input commands to adjust the means for horizontally moving or rotating the first sensor;

    a recorder used to record a maximal value of the magnetic signal; and

    a processor connected to the sensors, the display, the keyboard and the recorder, to calculate the position and depth of the underground metal pipe the first sensor, the second sensor and the third sensor comprises a coil wound core,wherein the processor calculates the position and the depth of the underground metal pipe by following formula;

    Co

    ( Flx )






    f

    ( x 1 , x 2 )


    2
    wherein;

    Co;

    Magnetic flux at core;

    Flx;

    Function set of the flux;

    f;

    General flux function;

    d;

    Pipe depth;

    x1;

    Function set of flux for pipe; and

    x2;

    Function set of flux for core.

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