管道厚度对电容层析成像的影响  

Effect of pipeline thickness on electrical capacitance tomography

作　　者：杨道业[1] 周宾[1] 许传龙[1] 汤光华[1] 王式民[1] 

机构地区：[1]东南大学能源与环境学院,南京210096

出　　处：《仪器仪表学报》2008年第7期1392-1397,共6页Chinese Journal of Scientific Instrument

基　　金：973国家重点基础研究计划(2004CB217702)资助项目

摘　　要：为了分析管道厚度对电容传感器的作用,定义了径极比(传感器管道内径与外径之比)的概念。通过ANSYS和MATLAB相结合的数值计算方式,探讨了8电极ECT传感器在不同径极比下的电容绝对值、电容变化值、电容变化率以及灵敏场的变化规律。随着径极比的增加,传感器电容对管内介质的灵敏度增加,且4种组合形式电极对的电容受管道厚度的影响程度有很大差异。仅采用LBP算法分别在不同径极比下重建层流、核心流和环状流图像。计算发现,高径极比下重建图像误差小,而在低径极比下层流的重建图像精度高于核心流和环状流。In order to analyze the effect of pipeline thickness on ECT sensor, radius-electrode ratio is defined as me ratio of inner radius and outer radius. The changing rules of 8-electrode sensor output characteristics, such as capacitance, capacitance variation, ratio of capacitance variation and sensitivity field, are discussed through numerical calculation using ANSYS and MATLAB, which are combined to simulate the sensor characteristics. With the increasing of radius-electrode ratio, the sensitivity of sensor capacitance to inner media increases, and the effects of pipeline thickness on capacitance for four typical inter-electrode structures are much different. Only LBP algorithm is adopted to reconstruct the images of stratified flow, core flow and annular flow for different radius-electrode ratios. Simulation results show that the image error in high radius-electrode ratio is small, and the image reconstructed from stratified flow is better than the ones from core flow and annular flow in low radius-electrode ratio.

关 键 词：管道厚度 径极比 传感器 电容层析成像 

分 类 号：TB934[一般工业技术—计量学]