Patent ID: 8148992

Claim:
A geophysical method, comprising: (a) providing at least one transmitter, the at least one transmitter having an axis thereof oriented horizontally; (b) providing at least one electric field sensor, positioned below the at least one transmitter to measure an ambient electrical parameter associated with a conductive medium external to and surrounding the at least one transmitter wherein the at least one electric field sensor comprises a first electrode and a second electrode; (c) passing, through the at least one transmitter, electrical energy having a selected waveform, whereby eddy currents are induced in the conductive medium; and (d) during the passing step (c), receiving, from the at least one electric field sensor, a signal proportional to the measured ambient electrical parameter, wherein a distance between the at least one transmitter and the at least one electric field sensor is adjustable by an operator, wherein the at least one transmitter and the at least one electric field sensor are interconnected at a substantially fixed distance when in operation performing the geophysical method, and wherein the first and second electrodes lie in a plane that is substantially parallel with a plane of the at least one transmitter.