电阻层析成像传感器软场特性分析  

Analysis of Soft Field in Electrical Resistance Tomography Sensors

作　　者：黄志尧[1] 晏颖[1] 王保良[1] 李海青[1] 

机构地区：[1]工业控制技术国家重点实验室

出　　处：《仪器仪表学报》2001年第6期573-576,共4页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金重大项目 (59995460 - 5)资助

摘　　要：电阻层析成像 ERT所基于的测量原理是 :在电场作用 (电流激励 )下被测区域中电阻分布的不同会导致边界电压的改变。ERT传感器测量敏感场受被测介质分布的影响 ,这一软场特性是 ERT图像重建中的主要困难之一。本文通过对电阻层析成像传感器的灵敏度分布的有限元分析 ,研究了软场特性的规律。结果表明 ,不同电阻率的介质分布对灵敏度值正负极性变化影响不大 ,而各处灵敏度值大小变化不仅与介质分布有关 ,还与该点在敏感场中的位置有关。Electrical resistance tomography (ERT) is based on the principle that boundary voltage changs with resistance distribution difference in measurement area under the influence of electrical field. The measurement sensitive field of ERT sensor is affected greatly by medium distribution. Such soft field character is one of major difficulties in image reconstruction of ERT. Through the analysis of sensitivity distribution, the rule of soft field is discussed. The results show that different resistance medium distribution affects the sensitivity polarity slightly, but the change of sensitivity value is related not only to medium distribution, but also to its location in sensitivity filed.

关 键 词：电阻层析成像 两相流 层析成像 传感器 软场特性 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TP274[自动化与计算机技术—控制科学与工程]