| Process tomography (PT) can provide two/three dimension real-time informationof the interior medium behavior within the process equipments, such as close pipes,vessels and so on. This gives a novel approach for two-phase flow parametermeasurement. Electrical Resistance Tomography is a kind of PT based on theresistance sensing array electrode. As an on-line measurement technique, ElectricalResistance Tomography (ERT) is playing an important role in the industrial processfor the advantages of visualization, non-invasion, low cost, and non-radiation.In this article, the author studied the fundamentals of ERT in detail. And basedon the visual measurement of gas/liquid two-phase flow, the ERT reconstructalgorithms were studied deeply and ameliorated precepts were proposed. Andsimulation software and application software were developed.The main contributions and work are as follows:1. Summarize the developing process and present status of the research on ERTAnd sum up the key issues of ERT technique demanding dealing with, involving thesystem structure, technique character.2. Analyze deeply the physics-mathematics model of ERT and deduce theanalytic solutions of ERT forward problem and the finite element solution;in addition,develop the FEM software package for ERT system.3. Propose a LBP algorithm with weight, and induct fast wavelet transform intomatrix calculation in kind of SBP algorithm, in this way, the dense matrix is changedinto a sparse matrix so that the computation cost is decreased.4. Propose a LBP algorithm with double weight and investigate the geometrycharacteristic of ANSYS simulation data and put forward the method that throughdata preprocessing the medium distribution was preliminarily determined, accordingto which the projection algorithms with the different weight were selected.5. Study in image processing way based on the image enhancement and imagesegmentation to eliminate the fuzzy and improve the image precision. Introduce theimage processing technique into process tomography technique.6. Design and complete the application software for two-phase flowmeasurement elementarily. |
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