电磁层析成像系统敏感场激励特性仿真研究  

Simulation of Excitation Characteristics in Sensing Field of Electromagnetic Tomography System

作　　者：付妍[1] 董峰[1] 谭超[1] 

机构地区：[1]天津市过程检测与控制重点实验室(天津大学),天津市南开区300072

出　　处：《中国电机工程学报》2011年第8期73-79,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50776063);天津市应用基础及前沿技术研究计划重点项目(08JCZDJC17700)~~

摘　　要：电磁层析成像(electromagnetic tomography,EMT)技术在过程检测中具有潜在的价值。电磁传感器阵列是电磁层析成像系统的前端,由于激励信号直接作用于电磁传感器阵列,因此激励模式、激励信号的频率和幅值特性直接影响检测线圈获取物场信息的质量,进而影响后续物场信息特征提取的精度。为了提高传感器阵列对物场信息分布变化的敏感程度,提高系统的敏感性和精确度,保证实验数据的高精度与高稳定性,利用有限元仿真软件COMSOL Multiphysics对电磁层析成像系统的激励模式和激励频率特性进行仿真分析,并获得激励模式及激励频率与传感器输出之间的关系,为电磁传感器阵列的优化使用奠定基础。Electromagnetic tomography （EMT） has potential value in process measurement. The frontier of electromagnetic tomography system is the sensor array. Owing to the excited signal acting on the sensor array directly, the excited strategy, the excited frequency and amplitude characteristics affect the quality of the information that the detected coil acquired from the object space. Furthermore, it would affect the accuracy of the information post extracted from the object field. To improve the sensitivity of the sensor array on the changes of the object field distribution, upgrade the sensitivity and accuracy of the system and guarantee high precision and high stability of the experimental data, finite element simulation software, COMSOL multiphysics was used, to analyze the excited strategy and the characteristic of the excitation frequency of EMT. And the relationship between the output character with the excited strategy and excited frequency was acquired. Establish the foundation in optimal using ofEMT sesor array was established.

关 键 词：电磁层析成像技术 敏感场 激励模式 激励频率 传感器阵列 

分 类 号：TM930[电气工程—电力电子与电力传动]