Reconstruction method of ECT System for unknown permittivity object

Electrical capacitance tomography(ECT) is one of process tomography(PT) technique which developed rapidly and matured in recent years.Its sensitivity distribution function depend on the permittivity distribution,namely 'soft field' characteristic of ECT sensor.The image-reconstruction algorithm is done by the sensitivity distribution of the known permittivity.According to analyze of the detection sensitivity of object measured with variable permittivity,one step simulation calculation method is used to calculate the permittivity of medium,when pipe is filled with high permittivity and low permittivity object respectively,filter linear backgroud projection(FLBP) is used to reconstruct the unknown permittivity object.