Patent ID: 8566043

Claim:
A detector for calculating the distortion of an electromagnetic field produced by a buried current carrying conductor, the detector comprising: a first antenna having an axis; a second antenna having an axis parallel to the axis of the first antenna and spaced a distance s from the first antenna; a third antenna having an axis parallel to the axes of the first and second antennas and spaced a distance 2 s from the first antenna and a distance s from the second antenna; means for comparing magnetic fields at the first and second antennas to produce a first compared value; means for comparing magnetic fields at the first and third antennas to produce a second compared value; first means for calculating the depth of said buried conductor based on the first and second compared values; second means for calculating the depth of said buried conductor based on the magnetic field at a pair of the first, second and third antennas; and means for comparing the depth calculation of the first means for calculating depth and the second means for calculating depth to calculate the distortion of the electromagnetic field produced by said buried current carrying conductor.