Electrical Resistance Tomographic Measurment Based On Injecting Dual Current Sources

Electrical resistance tomography reconstructs the internal conductivity (or impedance) profile of an object by applying currents into the object and measuring voltages between two electrodes mounted on the object boundary. This thesis presents a preliminary research work of employing two current sources to generate a measuring electric field suitable for ERT measurement. The work is aiming at increasing the number of independent measurements through which to obtain better ERT images withought the need of more electrodes as required in a traditional single current source ERT system setup that are commonly adopted by most ERT researches around world. The discussion in this thesis includes:1. Using both Ansys and Matlab to establish a forward solver to generate the voltage measurements under different dual current configurations. This work ensures that all the software developed with Matlab for FEM calculation can be verified by Ansys.2. Obtaing and analyzing the sensitivity field distribution within the pipe cross section under different dual current configurations. This work is required as providing a technical base for choosing appropriate inversion algorithms for ERT image reconstructions, as well as for designing a dual current source ERT measurement system.3. Analyzing the preliminary results of image reconstruction of dual current source ERT data based on the sensitivity method algorithm.4. Analyzing the preliminary result of image reconstruction of dual current source ERT by based on the modified Newton Raphson method algorithm.The work provides some useful experiences and forms a useful foundation for the future research work on dual current source ERT development.