电容层析成像传感器软场性能分析  

Analysis of Soft Field Characteristics of Capacitance Tomography Sensors

作　　者：颜华[1] 邵富群[1] 王师[1] 吴恩庚 

机构地区：[1]东北大学信息科学与工程学院,沈阳110006

出　　处：《东北大学学报（自然科学版）》1999年第5期457-460,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金

摘　　要：电容层析成像传感器的敏感场是软场，受被测介质分布的影响·以基于有限元分析的灵敏度快速计算法为工具，通过多种介质分布下灵敏度分布的计算与比较，研究了传感器的软场性能·结果表明，即便对于介电常数差异较小的气／ 油两相流，不同的电介质分布亦可导致灵敏度值有正、负百分之几十的变化·各处灵敏度变化不仅与管内介质分布有关，还与该点在敏感场中所处的位置有关·Capacitance tomography sensor possesses a soft sensing field. This field is distorted by the dielectric material distribution to be measured. Using a fast calculation method of sensitivity distributions based on finite element analysis, the sensitivity distributions under different permittivity distributions were calculated. The soft field characteristic of capacitance tomography sensor was investigated by comparing and contrasting these sensitivity distributions. Different phase distributions can result in several tenths increase or decrease in sensitivity values even if the two phase flow, such as oil/gas two phase flow, has a little difference in permittivity. The sensitivity value change at each pixel is relative to not only the dielectric material distribution inside the pipe, but also the pixel position.

关 键 词：电容层析成像 电容传感器 软场特性 灵敏度分布 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]