Abstract
Alternating magnetic field location technology has been used to establish the location and the depth of a buried pipe without digging; AC voltage applied to the conductive pipe makes current flow out both ways and leaks away to the surrounding soil. These currents along the pipe create a magnetic field of a cylindrical shape, which can be detected above the ground. This paper analyzes the performance of the previously developed locator which drives currents indirectly through a pair of driving coils above the ground. These currents and magnetic field are analyzed under the assumptions of homogeneous soil of pure resistance and quasi-steady field. Evaluated currents agree well with experimental data.
