摘要
平面电容层析成像(ECT)技术对复合材料粘接缺陷的图像重建,通常要借助灵敏度矩阵完成。ECT传感器的敏感场分布在一个三维空间,但用于缺陷检测的重建图像是二维的,因此存在不同层灵敏度矩阵的选取问题。探究了不同层灵敏度矩阵的选取,并提出了一种灵敏度矩阵改进方法。通过对负敏感区域的阈值处理和绝对值处理,改善了灵敏度矩阵的病态性和不均匀性,降低ECT正问题模化误差。仿真和实验结果表明,所提方法能够明显降低重建图像中的伪迹,提高重建缺陷的清晰度,进而降低缺陷误判或漏判的概率。
The planar capacitance tomography(ECT) technique is usually used to reconstruct the image of bonding defects of composite materials by means of sensitivity matrix. The sensitive field of ECT sensor is distributed in a three-dimensional space, but the reconstructed image for defect detection is two-dimensional, so there is the problem of selecting the sensitivity matrix of different layers. The selection of sensitivity matrix in different layers is explored, and an improved method of sensitivity matrix is proposed. Through the threshold processing and absolute value processing of the negative sensitive region, the ill condition and non-uniformity of the sensitivity matrix are improved, and the modeling error of ECT forward problem is reduced. Simulation and experimental results show that the proposed method can significantly reduce the artifacts in the reconstructed image, improve the clarity of the reconstructed defects, and then reduce the probability of false or missed judgment.
作者
张志远
颜华
周英钢
王伊凡
Zhang Zhiyuan;Yan Hua;Zhou Yinggang;Wang Yifan(School of Information Science and Engineering,Shenyang University of Technology,Shenyang 110870,China)
出处
《电子测量与仪器学报》
CSCD
北大核心
2022年第11期17-23,共7页
Journal of Electronic Measurement and Instrumentation
基金
国家自然科学基金(61372154,61071141)
辽宁省博士启动基金(201601157)项目资助。
关键词
平面电容层析成像
粘接缺陷
灵敏度矩阵改进
阈值处理
绝对值处理
planar ECT
bonding defects
sensitivity matrix improvement
threshold processing
absolute value processing
