Simulative Design of Electromagnetic Tomography Sensor on Double-Frequency Excitation Mode

Electromagnetic tomography (EMT) is a kind of electric tomography in combining with electromagnetic induction principles and computerized tomography. It is widely studied and applied in biomedical and industrial area recently. EMT sensor has advantages of non-invasion, non-contact and non-hazard. The paper aims to work on design of EMT sensor on double-frequency excitation. EMT sensor adopts eight coils distributed homogenously out of measuring pipe. The sensing field model is set up based on electromagnetic induction principle and the simulation is practiced in COMSOL Multiphysics. The relation between position information, conductivity and permeability of object and measurement electric potential are presented and analyzed in the paper. The diameters of screen and coils are simulated in the paper. Simulative result of EMT sensor describes the relation map of between sensing field and measurement voltage and provides useful prior information for design of EMT system.