电阻层析成像阵列电极结构设计及图像重建  

Design of Array Electrode Structural and Image Reconstruction for Electrical Resistance Tomography System

作　　者：刘琪芳[1,2] 韩焱[1] 

机构地区：[1]电子测试技术国家重点实验室中北大学信息与通信工程学院,山西太原030051 [2]山西农业大学信息科学与工程学院,山西晋中030801

出　　处：《仪表技术与传感器》2013年第10期79-81,84,共4页Instrument Technique and Sensor

基　　金：国家自然科学基金项目(61171179)

摘　　要：电阻层析成像系统图像重建的质量主要依赖于灵敏度矩阵的建立,而灵敏度矩阵的建立由传感器阵列电极结构参数决定。因此,为提高重建图像质量,对阵列电极结构的研究很有意义。文章在分析电阻层析成像的理论基础上,采用有限元变分原理建立敏感场数学模型,并利用迭代方法求解在相邻电极激励下重建数学模型。最终,通过分析宽电极覆盖率及接触阻抗对电极端电流线及图像重建质量的影响,表明传感器电极的结构参数对电阻层析成像敏感场灵敏度的分布有重要影响,进而影响重建图像的质量。因此对阵列电极结构参数的设计优化是极其必要的。Image reconstruction quality mainly depends on establishing the sensitivity matrix in Electrical Resistance Tomo- graphy System, and the sensitivity matrix is affected by the sensor structure parameters. In order to improve the image reconstruction quality, the design of electrode structure is very necessary. This article used the finite element variational principle to establish the mathematical model of sensitivity field based on resistance tomography theory, and used iterative methods for solving the reconstruc- tion mathematical model in the adjacent drive. Finally, though analyzing the influence of wide electrode coverage and contact imped- ance on the current line distribution and image reconstruction quality, research shows that the structure parameters of sensor elec- trode have important influence on the sensitivity distribution of resistance tomography sensitive field, and affect the reconstruction image quality. So the optimization design of array electrode structure parameter is extremely necessary.

关 键 词：电阻层析成像 阵列电极 有限元 图像重建 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]