The Reconstruction Of ET Three-dimensional Image

In recent years, with the development of technology and the progress of humansociety, both in industry and medical field, detection technology has been put forwardhigher request. Electrical tomography (ET) as an important technology of currentdetection aspect, at present it has a fast development in the two-dimensional testing,and many achievements have been made. But the development of industry hasprompted ET technology research to move towards to the three-dimensional aspect, sothat the three-dimensional information detection can be achieved and makevisualization as a new research aspect. So far there are many efficient and stablethree-dimensional reconstruction algorithms, which have been applied in medicine,chemistry, biology, etc, but considering that the ET measurement data is uncertain,compulsive, and "soft field effect", so all the three dimensional reconstructionalgorithms we have are not very effective.For three-dimensional reconstruction technology in the field of ET, the maincontributions and results in this paper are as follows:1）There are two important factors in three-dimensional reconstruction, whichare instantaneity and imaging effect. In order to make full use of the existing ETtechnology results, we develop three-dimensional algorithm on the basis of theexisting two-dimensional technology, the author use COMSOL Multiphysics3.4torealize three-dimensional simulation modeling, and analysis the effect of leakagecurrent ring in ET model to reconstruction. We make comprehensive comparison andanalysis on the applicability of the existing ET three-dimensional reconstructionalgorithms from the aspects of real-time and imaging effect, so as to choose theappropriate conjugate gradient method and fuzzy clustering algorithm.2）A new kind of three-dimensional sensor array has been designed for ETsystem, and we make an analysis on the effect of the electrode size and array distanceto measuring data.3）In this paper we propose a new three-dimensional reconstruction algorithmbased on interpolation algorithm, it fulfills the three-dimensional reconstruction onthe basis of making full use of the existing achievements of two-dimensional reconstruction algorithms. Its principle and process have been described in details inthis article, and in order to generate the key interpolation images, we use f-FCMalgorithm to find the clustering centers, and then the interpolation values aregenerated by using membership degree instead of grey value, so that thethree-dimensional reconstruction can be completed in ET measured field.4）According to different working conditions and different used data, theproposed algorithm is tested through two typical experiments, which are glass rodexperiment and bubbles experiment. According to their respective characteristics, theprocess of choice of two-dimensional reconstruction algorithms, the interpolationimage generation and three-dimensional reconstruction are analyzed in details.