Feasibility study of a swept frequency electromagnetic probe (SWEEP) using inductive coupling for the determination of subsurface CONDUCTIVITY OF THE EARTH AND WATER PROSPECTING IN ARID REGIONS (CSR TR 74-3)

摘要

A geophysical probing technique, which we call SWEEP, based on a measurement of the inductive coupling between two coils deployed on, or near, the surface of the earth has been developed as an extension of earlier work. One coil is energized with an alternating current and the other is used as a means of measuring the apparent magnetic field at a distance. Because the system requires no physical contact with the ground, and because many different frequencies are used, the inductive technique avoids many of the problems, and resolves many of the ambiguities, inherent in other geophysical probing techniques.nThe SWEEP inductive coupling technique shows promise as a means whereby subsurface conductivity can be measured quickly, easily, and inexpensively. And, because subterranean water causes contrasts in subsurface conductivity, this technique shows promise as a useful tool for the detection of ground water in arid regions.