Method and system for determining the depth of an electrically c

Details Method and system for determining the depth of an electrically c Method and system for determining the depth of an electrically c

1990-04-26

1992-06-02

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

324233, 324329, 324330, 324334, G01V 308, G01V 3165, G01V 338

Patent

active

051190281

ABSTRACT:
A method and system for determining the depth of an electrically conductive body in a medium having a known conductivity and a known permeability. The method comprises the steps of generating a primary magnetic field having a time-varying field strength, and transmitting that primary magnetic field into the medium. The primary magnetic field induces an electric current in the conductive body, and this electric current generates a secondary magnetic field that also has a time-varying field strength and that propagates outward from the conductive body and through the medium. The method of this invention further includes the steps of sensing the strength of that secondary magnetic field, comparing the primary and secondary magnetic fields to measure the phase difference therebetween, and then calculating the depth of the conductive body in the medium from the detected phase difference.

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