Analysis And Calculation Of The Transducer Field In 12-Electrode Electrical Capacitance Tomography System

Process tomography (PT) technique is a new technique developed rapidly in recent years, which has great developmental potential and wide industrial application prospect in solving the measurement problem of multiphase flow. Electrical capacitance tomography (ECT) technique is a kind of PT technique based on the sensitive principle of capacitance, and it has been the most popular research direction and the main development technique of PT, due to its many distinct advantages such as no radiation, no invasion, high speed of response, simple structure, low cost, wide application range, better safety and so on. Though ECT has lots of advantages, there is still a lot of work to be done for practical use of the technique.This dissertation is based on the study of 12-electrode electrical capacitance tomography system for oil-water two-phase measurement. The main works and contributions of this dissertation are as follows:1. It points out the important meaning of multiphase flow measurement to the science research and industry production based on the background of problem studied in this dissertation. It sums up the features of multiphase flow, also sorts and measured parameters. It analyzes the current status and developing trend of the future multiphase measure.2. The basic principle of process tomography is discussed, also the system constitution, the basic principle, developing status and the problems it faces. Process tomography based on various sensing technique is introduced3. The principle and constitution of electrical capacitance tomography system is analyzed and mathematical model of sensitivity field is proposed. The current status of ECT technique is discussed.