电容层析成像三维传感器结构设计及图像重建

Design of Three-Dimensional Sensor and Image Reconstruction for Electrical Capacitance Tomography

针对二维电容层析成像系统轴向分辨率低,敏感场分布的均匀性对图像重建的影响,在分析电容层析成像基本原理的基础上,提出了一种新型的三维电容层析成像传感器结构.该结构以三层4电极结构为基础,在保持原有电极总面积不变情况下,将每个电极一分为二变成三层8电极传感器,利用多电极组合激励测量模式将每层划分为8个组合,每个组合作为一个电极,这样不仅能增加投影数据,还能提高测量精度.仿真实验结果表明,与三层4电极结构相比,三层8电极能够获得更多的独立测量电容数,又能提高测量精确度,敏感场分布的均匀性得到改善,提高传感器的中心部位图像重建的质量.

Aiming at axial resolution is low for the two dimensional electrical capacitance tomography system, and the effect of sensitivity field distribution uniformity on image reconstruction. On the basis of analyzing the basic principle of electrical capacitance tomography, We put forward the type of three-dimensional capacitance tomo- graphy sensor structure. The structure is based on the structure of the 3 - layer four electrode structure. In the case of keeping the total area of the original electrode, each electrode is divided into 8 layers of three electrodes, using the multi electrode combination, the measurement mode is divided into 8 combinations per layer, and each combi- nation is used as an electrode. This can not only increase the projection data, but also improve the accuracy of measurement. Simulation experiment results show that compared with the 4 -layer three three layers $ electrode can obtain more independent measurement capacitance, and it can measurement, the uniformity of the distribution of the sensitive field and the quality of the the central part of the sensor are improved. electrode structure, the improve the accuracy of image reconstruction of