摘要
为提高电容层析成像系统图像重建的质量,采用有限元方法,建立电容层析成像系统敏感阵列电极二维数学模型,同时以8电极水气两相流电容层析成像为研究对象,分析不同电极覆盖率以及屏蔽电极与电极外表面距离对电容层析成像系统电容值及敏感区域的影响。结果表明,电极覆盖率在80%左右时,电容传感器灵敏度均匀性得到提高,屏蔽半径是管道内径的1.4～1.8倍时,固有电容达到最大。依据仿真结果,证明建立的有限元模型是正确的,经优化设计后的传感器使电容层析成像系统的图像重建质量得到提高。
To improve the quality of image reconstruction,a mathematical model of 2-dimensional electrical capacitance tomography electrodes array is established,and the object of study is 8-electrode water-gas two-phase flows electrical capacitance tomography system.The influence of the covering ratio and guards radius on capacitance and sensitive area were analyzed by the finite element method.The results show the sensitivity uniformity of sensors are improved while the electrode covering ratio is around 80%,and inherent capacitance achieves maximum while guard electrode radius size is 1.4~1.8 times of pipe diameter.According to the simulation results,finite element model is right,and the result of image reconstruction is improved effectively due to the sensor＇s optimal design.
出处
《电机与控制学报》
EI
CSCD
北大核心
2011年第6期62-66,共5页
Electric Machines and Control
基金
国家自然科学基金(50976018)
关键词
气液两相流
电容层析成像
优化设计
有限元仿真
图像重建
gas-liquid two-phase flow
electrical capacitance tomography
optimal design
finite element simulation
image reconstruction
