基于宽频激励的平面电磁层析成像方法  

Planar Electromagnetic Tomography Based on Wide-band Excitation

作　　者：张文彪[1] 耿一健 颜鹏旭 ZHANG Wenbiao;GENG Yijian;YAN Pengxu(School of Control and Computer Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学控制与计算机工程学院,北京102206

出　　处：《计量学报》2024年第6期907-914,共8页Acta Metrologica Sinica

基　　金：北京市自然科学基金(3242023)。

摘　　要：为了实现对高低电导率材料的检测与成像,提出了一种基于宽频激励的平面电磁层析成像方法。根据线圈的电磁特性及实验测试结果,探讨了平面线圈阵列的优化方法。通过有限元仿真模型,采用场量提取法获取灵敏度矩阵,并针对灵敏度矩阵的均匀性问题提出了改进方法,提高了图像重建质量。通过仿真模型评估了不同电导率物体的图像重建质量,仿真结果证明了提出的平面电磁层析成像方法可以实现对高低电导率材料的成像。搭建了基于宽频激励的平面电磁层析成像实验系统,并对多种不同电导率物体进行了成像实验。实验结果表明,重建图像平均相关系数为0.77,平均定位误差为4.46 mm。In order to achieve simultaneous detection and imaging of high and low conductivity materials,a wide-band excitation method for the planar electromagnetic tomography is designed.Based on the electromagnetic characteristics of the coil and experimental results,an optimization method for the design of the planar coil array is investigated.Through the finite element model,the sensitivity matrix is obtained using the perturbation method and an improvement is proposed for the uniformity of the sensitivity matrix in order to improve the quality of image reconstruction.The image reconstruction of objects with different conductivity is investigated through the simulation model and the results verify that the proposed planar electromagnetic tomography method can reconstruct high and low conductivity materials.A wide-band excitation system for the planar electromagnetic tomography is built and experimental investigations are conducted on various materials with different conductivity.The experimental results show that the average correlation coefficient is 0.77 and the average location error is 4.46 mm.

关 键 词：电磁计量 电磁层析成像 平面线圈阵列 电导率 灵敏度矩阵 宽频激励 

分 类 号：TB971[一般工业技术—计量学]