电磁层析成像(EMT):正问题的理论分析

基金项目: 国家自然科学基金资助项目(69574021;59877018)

Electromagnetric Tomography (EMT):Theoretical Analysis of the Forward Problem

School of Electrical Automation and Energy Engineering, Tianjin University, Tianjin 300072, P R China

摘要: 基于感应原理的电磁层析成像(EMT)是一种新颖的工业过程成像技术。通过解析求解特定的两组分流成像正问题,导出了二维磁场分布的精确表达式,定量分析了传感器内部的物理机制和EMT技术的可检测性极限,建立了场灵敏度的直接数学表达式和灵敏度图。在一定程度上,为传感器的定量设计,EMT技术术的可检测性分析和两组分过程的图像重建提供了数理基础。
- 电动力学 /
- 多相流 /
- 层析成像 /
- 传感器技术 /
- 电磁测量技术
Abstract: Inductance-based electromagnetic tomography(EMT)is a novel industrial process tomographic technique.Exact expressions of the magnetic field distribution in a two-dimensional object space were derived by analytically solving the forward problem for a particular two-component flow. The physical mechanisms within the sensor and the detectability limits of the EMT technique were quantitatively analyzed.Direct mathematical expressions for the field sensitivity and the sensitivity maps were established.To a certain extent,mathematical and theoretical bases are given for quantitative design of the sensor,detectability analysis of the EMT technique and image reconstruction of two-compontnt processes based on the linear back-projection algorithm.
- electrodynamics /
- multi-phase flows /
- tomography /
- sensor technique /
- electromagnetical measurement technique

[1]	Dickin F J, Hoyle B S, Hunt A, et al. Tomographic imaging of industrial process equipment:techniques and applications[J]. IEE Proc G,1992,139(1):72-82.
[2]	Huang S M, Xie C G, Thorn R, et al. Design of sensor electronics for electrical capacitance tomography[J]. IEE Proc G,1992,139(1):83-88.
[3]	Seager A D, Barging D C, Brown B H. Electrical impedance imaging[J]. IEE Proc A,1987,134(2):201-210.
[4]	Yu Z Z, Peyton A J, Conway W F, et al. Imaging system based on electromagnetic tomography (EMT)[J]. Electron Lett,1993,29(7):625-626.
[5]	Yu Z Z, Peyton A J, Xu L A, et al. Electromagnetic inductance tomography (EMT): sensor, electronics and image reconstruction algorithm for a system with a rotatable parallel excitation field[J].IEE Proc A,1998,145(1):20-25.
[6]	Xie C G, Huang S M, Hoyle B S, et al. Electrical capacitance tomography for flow imaging: system model for development of image reconstruction algorithms and design of primary sensor[J]. IEE Proc G,1992,139(1):89-98.
[7]	Harpen M D. Eddy current distribution in cylindrical samples: effect on equivalent sample resistance[J]. Phys Med Biol,1989,34(9):1229-1238.
[8]	Smythe. Static and Dynamic Electricity[M]. New York: McGraw-Hill,1951.