The use of simultaneous iterative reconstruction technique or electrical capacitance tomography

摘要

Hihg-quality reconstruction of capacitance tomography data is important to get the quantitative information from the cross sectional images of the multiphase pipe flow.Because of the complex nature of the capacitance snesors,the reconstruction algrithms well develoed for medical tomography are not applicable.the main problems lie in two aspects.One is the "soft-field" effect,the other is the limited number of measruements.To resolve these problems and get high-qulity images,a reconstruction algrithm named Simultaneous Iterative Reconstruction technique (SIRT) often sued in geology investigation is introduced.According to the fastness of the process tomography and the smoothing effect of SIRT.some improvements have been made.These mehtods are ocmpared to the well-known linear back projection algorithm (LBP) and the linear back projection thresholded algorithm widely used in capacitance tomography.A computer simulated eitht-electrode capacitance tomography system has been used for the evaluation.