neljäelektrodimenetelmää
The four-electrode method, known in Finnish as neljäelektrodimenetelmä, is a fundamental technique used in electrical resistivity surveys and geophysics. It is employed to measure the electrical resistivity of the subsurface by injecting current into the ground and measuring the resulting potential difference. This method uses four electrodes, typically arranged in a straight line. Two outer electrodes inject a direct or low-frequency alternating current into the earth, while two inner electrodes measure the potential difference between them.
The arrangement of the electrodes is crucial for the accuracy of the measurements. Common configurations include