: Equipment
Electrical resistivity tomography has been undertaken on a number of sites for the Discovery Programme by Dr Paul Gibson, NUI Maynooth.
The equipment used is a Campus Geopulse resistivity meter. Electrical imaging is undertaken using an insulated multi-core cable with a number of fixed interval take off points to which electrodes are connected. The cable is connected to the resistivity meter which in turn is connected to a laptop computer which contains the relevant software to run the process. A parameter file was written to instruct the computer which sets of 4 electrodes to use and the currents to apply. In order to determine how the true resistivity varies with depth the data must be modelled using a computer program. One such program that is widely used in resistivity work is the inversion program RED2DINV.