Magnetic Induction Tomography Using Multi-Channel Phase-Domain Transceiver for Structural Health Monitoring

Jeon, Jiyun; Park, Chan Sam; Lee, Sangheon; Chae, Hee Young; Kim, Jae Joon; Son, Hungsun

doi:10.1109/tim.2022.3151951

Cited by 9 publications

(4 citation statements)

References 29 publications

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“…An important distinction between multicoil and single-coil MIT electronics lies in the manner of excitation and signal detection. While multicoil MIT methods rely upon detection of the phase difference between excitation and response fields [9], the single-coil MIT system discussed herein relies upon inductive loss detection in an RLC tank circuit. Either strategy encounters increasingly serious problems as electrical conductivity becomes small-either the induced field becomes too small to detect a phase difference, or inductive loss becomes small when compared with background noise.…”

Section: Introductionmentioning

confidence: 99%

Image Reconstruction Requirements for Short-Range Inductive Sensors Used in Single-Coil MIT

Feldkamp

2024

Sensors

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MIT (magnetic induction tomography) image reconstruction from data acquired with a single, small inductive sensor has unique requirements not found in other imaging modalities. During the course of scanning over a target, measured inductive loss decreases rapidly with distance from the target boundary. Since inductive loss exists even at infinite separation due to losses internal to the sensor, all other measurements made in the vicinity of the target require subtraction of the infinite-separation loss. This is accomplished naturally by treating infinite-separation loss as an unknown. Furthermore, since contributions to inductive loss decline with greater depth into a conductive target, regularization penalties must be decreased with depth. A pair of squared L2 penalty norms are combined to form a 2-term Sobolev norm, including a zero-order penalty that penalizes solution departures from a default solution and a first-order penalty that promotes smoothness. While constraining the solution to be non-negative and bounded from above, the algorithm is used to perform image reconstruction on scan data obtained over a 4.3 cm thick phantom consisting of bone-like features embedded in agarose gel, with the latter having a nominal conductivity of 1.4 S/m.

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Section: Introductionmentioning

confidence: 99%

Image Reconstruction Requirements for Short-Range Inductive Sensors Used in Single-Coil MIT

Feldkamp

2024

Sensors

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“…These currents generate their own (secondary) information about the passive electromagnetic properties, such as electrical conductivity, permittivity, and magnetic permeability. In manufacturing applications, a multi-channel MIT system is applied to identify the various sizes of cracks on carbon fiber rods [18], conductive fluid imaging [19], and molten metal flow visualization [20]. In biomedical engineering, MIT applications involve Hemorrhagic stroke detection [21]- [23], lung imagining [24], and liver tissue monitoring [25].…”

Section: Introductionmentioning

confidence: 99%

Distributed Current Source Method for Modeling of Magnetic and Eddy-Current Fields in Sensing System Design

Lin

Teng

2023

IEEE Access

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This paper presents a distributed current source (DCS) method for modeling the eddy current (EC) field induced in biological or non-ferrous metallic objects in two-dimensional axisymmetric and three-dimensional Cartesian coordinates. The EC fields induced in the objects, magnetic flux density (MFD) in space, and magnetic flux (MF) of the sensing coils are formulated in state-space representation. The harmonic responses of the eddy current fields and electromotive force (EMF) of the sensing coil are formulated in closed-form solutions. The proposed DCS method is applied to design two eddy current sensing systems. The Bio-Differential Eddy Current (BD-EC) sensor distinguishes biological objects, and the Metal-Coaxial Eddy Current (MC-EC) sensor classifies non-ferrous metallic objects. The simulated EC field and EMF are numerically verified by comparing results with finite element analysis. An example is utilized to illustrate the advantage of the DCS method for calculating the MFD, MF, and EMF contributed from the induced ECD in the objects directly, and the EMF generated from each material. The proposed method, along with a prototype of BD-EC sensor, has been experimentally evaluated on sweep frequency analysis for detecting meat and bone.

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“…It has been applied in industry (e.g. the monitoring of the melting process [1,2], the testing of metal/non-metal components [3][4][5], and the visualization of the multiphase flow processes in fluidized beds [6][7][8][9]) and in biomedicine [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Design of soft-magnetic shield in electromagnetic tomography

Liang,

Wang,

et al. 2023

Meas. Sci. Technol.

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In the electromagnetic tomography (EMT) system, the soft-magnetic shield is employed to avoid the external interference at low frequency. However, the influence of the soft-magnetic shield on the measurement lacks theoretical exploration, and the design of the soft-magnetic shield is arbitrary. To solve this problem, the effect of different thicknesses and locations of the soft-magnetic shield on the measurement is compared by numerical simulation. It is observed that the soft-magnetic shield not only enhances the boundary measurement data and sensitivity but also improves the quality and stability of the reconstructed images. The smaller the distance between the soft-magnetic shield and the pipe, or the bigger the thickness of the soft-magnetic shield, the better the improvement. The physical mechanism of the above results is explicated by the equivalent magnetic circuit analysis method. Based on the above investigation, the optimal structure of the soft-magnetic shield is designed, and it is verified by experiments.by experiments.

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Magnetic Induction Tomography Using Multi-Channel Phase-Domain Transceiver for Structural Health Monitoring

Cited by 9 publications

References 29 publications

Image Reconstruction Requirements for Short-Range Inductive Sensors Used in Single-Coil MIT

Image Reconstruction Requirements for Short-Range Inductive Sensors Used in Single-Coil MIT

Distributed Current Source Method for Modeling of Magnetic and Eddy-Current Fields in Sensing System Design

Design of soft-magnetic shield in electromagnetic tomography

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