This ratio goes about up to one-tenth or one-fifteenth depending on the signal strength. As a rule of the thumb, the reasonable distance between M and N should be equal or less than one-fifth of the distance between A and B at the beginning. At this point, the potential electrodes M and N are moved outward to a new spacing. With the Schlumberger array, for each measurement the current electrodes A and B are moved outward to a greater separation throughout the survey, while the potential electrodes M and N stay in the same position until the observed voltage becomes too small to measure ( source). The two outer electrodes, A and B, are current electrodes, and the two inner electrodes, M and N, are potential electrodes placed close together. The Schlumberger array is an array where four electrodes are placed in line around a common midpoint. Today, we’re discussing the Schlumberger array.
This is the second article in our series exploring 11 electrode arrays and methods. Electrode arrays were developed in order to make field measurements more efficient and data interpretation easier. Electrode arrays are different arrangements of electrodes used to perform geophysical resistivity measurements.
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