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Ocean Tech: Electromagnetic Sensing

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Application US20150097567


Published 2015-04-09

Dual-radiation Non-ferrous Metal Prospecting System

Methods and apparatus for a Dual Emission Non-Ferrous Metal Prospecting System are disclosed. One embodiment comprises methods and apparatus for finding metal deposits in the Earth, and then determining whether these metal deposits are ferrous or non-ferrous. One embodiment includes an Electromagnetic Quartz Penetrator. The Electromagnetic Quartz Penetrator includes a transmitter, a receiver, antennas and a first signal processor. One embodiment also includes an Omni-Directional H Field Metal Exciter and Sensor. The Omni-Directional H field exciter produces an output which has a spatial dissipation rate proportional to a factor of 1/r3, and, therefore, has a relatively short range compared to the Electromagnetic Plane.



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2 Independent Claims

  • 1. An apparatus comprising: an electromagnetic quartz penetrator; said electromagnetic quartz penetrator including a transmitter and a receiver; said receiver including a signal processor; said electromagnetic quartz penetrator being aimed at a two-dimensional surface of the Earth; said electromagnetic quartz penetrator transmitter generating an Electromagnetic Plane Wave having mutually orthogonal electric and magnetic field components; said planar wave being aimed generally orthogonally to said two-dimensional surface of the Earth, and having a spatial dissipation rate proportional to a factor of 1/r2; said planar wave being used to identify a relatively small three-dimensional volume of Earth adjacent to said two-dimensional surface; said three-dimensional volume of Earth being identified as containing a deposit of metal by said electromagnetic quartz penetrator; said planar wave causing a reflection from said deposit of metal which is captured by said receiver; said receiver including said signal processor for interpreting said reflection from said deposit of metal; said receiver including a display for indicating the approximate spatial coordinates of said deposit of metal from said two-dimensional surface of the Earth; an H field metal exciter and temporal sensor; said H field metal exciter producing a magnetic field component; said H field metal exciter being placed into a hole formed in said two-dimensional surface of the Earth which is predicted to contain a deposit of metal by said electromagnetic quartz penetrator; said H field exciter being used to radiate an H field which induces an eddy current in a metal deposit in a vein of quartz within said small volume of Earth; said H field exciter producing an output which has a spatial dissipation rate proportional to a factor of 1/r3; said eddy current being characterized as a generally circular swirl of current within said metal deposit; said eddy current causing a return H Field to be radiated back to said sensor; said temporal sensor being connected to said signal processor which is used to compute a time interval; said temporal sensor for receiving said return H Field generated by said eddy current in said metal deposit; said time interval being measured between a first time T1 and a second time T2; said first time, T1, being recorded when said exciter begins to induce said eddy current in said metal deposit; said second time, T2, being recorded when said eddy current generated field from said metal deposit that has been emanated by said eddy current is sensed by said temporal sensor and calculated by said second signal processor; and determining that said metal deposit is non-ferrous if said time interval T2 minus T1 is generally instantaneous in duration.

  • 20. A method comprising the steps of: using an Electromagnetic Plane Wave which has a spatial power dissipation rate proportional to 1/r2 to identify a deposit of metal within the Earth and the location of said deposit of metal within the Earth; inducing an eddy current in said deposit of metal using an H Field; said H Field having a spatial power dissipation rate proportional to 1/r3; said eddy current creating a return signal; receiving said return signal emanated by said eddy current; and measuring the time required between the inducement of said eddy current in said deposit of metal and the time said return signal is received to determine whether said deposit of metal is non-ferrous.