摘要
电容层析成像系统传感器的敏感场分布受多相流介质分布的影响,软场特性给图像重建带来很大困难。该文以8电极油水两相流电容层析成像为研究对象,采用有限元仿真的方法,分析了径向电极及其嵌入尺寸对电容层析成像系统电容值及敏感场分布的影响。通过仿真分析,确定了径向电极的嵌入尺寸,从而能够在缩小测量电容值的动态变化范围,减轻数据采集电路设计难度的同时,提高电容响应的灵敏度,改善传感器敏感场的分布,提高电容层析成像系统的性能。
Sensor sensitivity field in electrical capacitance tomography is affected by the distribution of multiphase medium, and the soft field characteristic causes great difficulty for image reconstruction. The object of this paper is 8-electrode oil-water two-phase flows electrical capacitance tomography system. The influence of the radial electrodes and their embedded size on capacitance and sensitivity distribution are analyzed by the method of finite element simulation. The embedded size of radial electrodes is fixed through the simulation analysis. As a result, the dynamic range of capacitance is reduced and the difficulty in design of data capture circuit is mitigated. Meanwhile the enhanced sensitivity of capacitance response improve distribution of sensor sensitivity and performance of ECT are obtained.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2005年第21期149-155,共7页
Proceedings of the CSEE
基金
国家自然科学基金项目(60572153)教育部重点科技项目(204043)黑龙江省骨干教师计划(1054G014
10551043)哈尔滨市重点科技攻关项目(2005AA1CG035)。~~
关键词
传感器
容层析成像
径向电极
电容敏感场
有限元仿真
Sensor
Electrical capacitance tomography
Radial electrode
Capacitance sensitivity field
Finite element simulation
