Computercontrolled multielectrode systems

Conventional resistivity methods can be enhanced by the group installation of twenty-five or more electrodes at a time, which are inserted at the ground surface along a line or in a grid pattern. These electrodes are then connected via switching units and multicore cable to a computer-controlled transmitter and receiver unit (Sharma, 1997). This computer-controlled multielectrode system allows an electric current to be applied between any two electrodes along a line or within a grid, while at the same time the electric potential difference is measured with respect to another electrode pair along the line or within the grid. The system is normally programmed to collect a sequence of

pa measurements from successive sets of four electrodes (two current and two potential) that are a part of the multielectrode line or grid. The main advantage of a computer-controlled multielectrode system over conventional resistivity methods is in the reduced amount of time it takes to carry out a resistivity survey.

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