Resistivity

Some articles on resistivity:

Characterisation Of Pore Space In Soil - Modelling Methods - Electrical Resistivity Imaging
... Using the infinite resistivity of air, the air spaces within a soil can be mapped ... A specially designed resistivity meter had improved the meter-soil contact and therefore the area of the reading ...
Spreading Resistance Profiling - Theory of Operation
... encountered within the slab is, where is the measured resistance in ohms, (rho) is the resistivity of the slab in ohm-cm, and is the radius of the contact area in cm ... Most of the resistance occurs very close to the electrical contact allowing the local resistivity to be determined ... (nearly ohmic contact) over the entire resistivity range for both p-type and n-type (rich in holes and rich in electrons respectively) ...
Resistivity Logging
... Resistivity logging is a method of well logging that works by characterizing the rock or sediment in a borehole by measuring its electrical resistivity ... Resistivity is a fundamental material property which represents how strongly a material opposes the flow of electric current ... In these logs, resistivity is measured using 4 electrical probes to eliminate the resistance of the contact leads ...
Magnetotellurics - Commercial Applications - Hydrocarbon Exploration
... subsurface structure, it cannot detect the changes in resistivity associated with hydrocarbons and hydrocarbon-bearing formations ... MT does detect resistivity variations in subsurface structures, which can differentiate between structures bearing hydrocarbons and those that do not ... At a basic level of interpretation, resistivity is correlated with different rock types ...
Electrode Array - Resistivity
... Resistivity measurement of bulk materials is a frequent application of electrode arrays ... Assuming the material is homogenous, the resistivity is given by, Electrode arrays are widely used to measure resistivity in geophysics applications ... It is also used in the semiconductor industry to measure the bulk resistivity of silicon wafers, which in turn can be taken as a measure of the doping that has been applied ...