Geophysical Resistivity Survey Equipment Electrical Resistivity Meters for ground water exploration Geoelectrical Underground Water Detector
What is electrical resistivity?
Electrical resistivity is a geophysical technique for imaging sub-surfaces structures from electrical measurements made at the surface, or by electrodes in one or more boreholes. It is closely related to the medical imaging technique electrical impedance tomography (EIT), and mathematically is the same inverse problem
What is theory of geophysical resistivity meter?
Surface electrical resistivity surveying is based on the principle that the distribution of electrical potential in the ground around a current-carrying electrode depends on the electrical resistivities and distribution of the surrounding soils and rocks. The usual practice in the field is to apply an electrical direct current (DC) between two electrodes implanted in the ground and to measure the difference of potential between two additional electrodes that do not carry current. Usually, the potential electrodes are in line between the current electrodes, but in principle, they can be located anywhere. The current used is either direct current, commutated direct current
More types array can be chose for geophysical resistivity meter
Wenner Array
Schlumberger Array
The Gradient Array
Other array spacing
Different method of resistivity meter
Vertical Electric Sounding
Electric profiling
Electric Imaging
Limitations of Resistivity survey
Resistivity surveys can offer an alternative imaging technique that works well to identify subsurface material. However, as with other geophysical methods, there are some limitations. For example, with VES surveys there is a limit to how far the detectable depth is. This mostly relies on the maximum separation of current electrodes. Additionally, VES generally works with horizontal layers so if the area has steep topographic variation then the survey will be difficult.
Geophysical Resistivity Survey Equipment Electrical Resistivity Meters for ground water exploration Geoelectrical Underground Water Detector
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