In electrical tomography techniques, such as Electrical Resistivity Tomography (ERT), Electrical Capacitance Tomography (ECT) and Electrical Impedance Tomography (EIT), known voltage or current is applied to the periphery of the target via an appropriate electrode configuration. This will induce an electrical potential distribution in the target, and the shape of the potential distribution depends on the distribution of materials within the target.
The effects of material distribution can be measured with the electrodes attached on the periphery of the target domain. With suitable mathematical models and data processing algorithms it is possible to determine images of material distributions in the region of interest.
In process industry, this information may be very useful e.g. for optimal process control. Main advantages of electrical tomographic techniques are good time resolution, affordable price and negligible health and safety issues. Check ET Technology page for more information about utilizing ET technology in industrial environments.