Brantax - engineering survey

underwater, underground
and surface investigation

Dipole – Dipole

The dipole-dipole array is logistically the most convenient in the field, especially for large spacing. All the other arrays require significant lengths of wire to connect the power supply and voltmeter to their respective electrodes and these wires must be moved for every change in spacing as the array is either expanded for a sounding or moved along a line. The convention for the dipole-dipole array shown below is that current and voltage spacing is the same, “a”, and the spacing between them is an integer multiple of “a”.

The apparent resistivity is given by: