ECT传感器灵敏场在不同管径下对重建图像保真度的影响研究  

Study on Fidelities of ECT Reconstructed Images in Different Diameter Pipeline Sensitivity Distributions

作　　者：王雷[1] 邵晓寅[2] 

机构地区：[1]山东大学控制学院,济南250061 [2]香港城市大学制造工程与工程管理学系

出　　处：《电子测量与仪器学报》2005年第4期20-24,共5页Journal of Electronic Measurement and Instrumentation

基　　金：本课题为国家自然科学基金重大资助项目(项目编号:59995460-5);国家"863"计划专项经费资助项目(项目编:2001AA413210);浙江省自然科学基金资助项目(项目编号:600094)。

摘　　要：用有限元法对电容层析成像系统的传感器进行了分析,得到了在不同管径下的灵敏场分布。为了提高图像重建质量,对灵敏场分保留与去掉相邻电极两种情况进行了处理。分别利用处理前后的灵敏场,以保真度为指标,对比不同管径下成像的仿真结果,得出在小管径下利用处理后的灵敏场重建的图像保真度较高,而在大管径下利用处理前的灵敏场重建的图像保真度较高,并利用大小两种管径的传感器进行了实验验证。对于ECT应用中,为获得相对较高的重建图像保真度,在不同管径下选用不同的灵敏场处理方法提供了参考依据。The sensor of electrical capacitance tomography （ECT） was analyzed by the finite element method （ FEM）. The sensitivity distributions of different diameter pipelines were carried out and modified in order to improve the quality of the ECT image reconstruction. The images of different diameter pipeline were reconstructed by using the different sensitivity distributions. Fidelity was used to evaluate the qualities of reconstructed images. The results show that the fidelities of the reconstructed images by using the modified sensitivity in small diameter sensors are higher than those by using original sensitivity; on the other hand, the fidelities by using the original sensitivity in big diameter sensors are higher than those by using the modified sensitivity. The experimental tests of two different diameter pipeline ECT sensors also show the same results. It provides the criterion to select sensitivity distribution when ECT is used to different diameter pipelines.

关 键 词：层析成像 有限元 图像重建 保真度 灵敏场 ECT传感器 重建图像 小管径 灵敏 电容层析成像系统 

分 类 号：TP317[自动化与计算机技术—计算机软件与理论] U472.43[自动化与计算机技术—计算机科学与技术]