Composite Sensitivity Matrix for Reducing the Influence of Medium Electrification on Electrical Capacitance Tomography

Tang, Kaihao; Hu, Hongli; Li, Lin; Wang, Xiaoxin

doi:10.1109/tim.2019.2910343

Cited by 11 publications

(3 citation statements)

References 28 publications

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“…The solution methods for the forward problem can be classified into analytical methods and numerical methods. In this study, the finite element method (FEM) is employed to solve the forward problem [24]. FEM is a commonly used numerical method that utilizes software such as COMSOL to model the system and set the given conditions (geometric parameters, distribution of media and electrical parameters, excitation conditions, etc) to obtain information such as boundary voltage measurements.…”

Section: The Forward Problem and Inverse Problem Of Eit 221 Forward P...mentioning

confidence: 99%

A CV weighted method for oil-water two-phase flow of non-contact multi-frequency el7ectrical impedance tomography

Bai,

Wang

2024

Phys. Scr.

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Electrical tomography (ET) technology has attracted extensive attention in the field of scientific research on oil-water two-phase flow due to its advantages of non-intrusion, non-radiation, and simple equipment structure. Affected by Maxwell-Wagner-Sillars (MWS) effect, more imaging information can be obtained by changing the excitation frequency, especially for the mixtures with conductive phases. In this paper, a CV (coefficient of variation )-weighted method of non-contact multi-frequency electrical impedance tomography (NM-EIT) system is carried out for water-oil two-phase flow imaging. Firstly, the frequency response of the measurement system is studied and the electrical impedance information of medium in the region of interest (RoI) is observed. Secondly, the measured electrical impedance information with with different excitation frequencies are weighted by CV method. Finally, combined with the classic image reconstruction algorithm, the simulation and static experiment are carried out to verify the reconstruction effect of the proposed method. The imaging accuracies under different frequencies and flow patterns are analyzed, and a measurement experimental platform is set up to verify the reconstruction effect of the proposed method. The experimental results show that the CV-based multi-frequency weighted method maintains a higher imaging accuracy than single-frequency imaging.

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Section: The Forward Problem and Inverse Problem Of Eit 221 Forward P...mentioning

confidence: 99%

A CV weighted method for oil-water two-phase flow of non-contact multi-frequency el7ectrical impedance tomography

Bai,

Wang

2024

Phys. Scr.

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“…This is because the sensitivity of ECT has much smaller values at the center. Further, a widely used factor, image correlation coefficient (ICC) [25], is adopted to evaluate the quality of the three algorithms, which is defined as…”

Section: ) Comparison Between Lbp Lia and Cs-ffpcmentioning

confidence: 99%

A Water Fraction Measurement Method Using Heuristic-Algorithm-Based Electrical Capacitance Tomography Images Post-Processing Technology

Liu

Tang²,

Tang

et al. 2020

IEEE Access

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This paper presents a sectional water fraction measurement method using electrical capacitance tomography (ECT) image. To achieve a desired measurement accuracy, an optimal threshold-search method based on fast simulated annealing (FSA) algorithm is applied for image binarization; and to guarantee the imaging time consumption, fast fixed point continuation (FFPC) iterative algorithm cooperating with the compressed sensing (CS) theory was applied to the image reconstruction. In this study, the imaging time consumption and the measurement accuracy of water fraction are used to compare the proposed method and other methods. A numerical model is established with COMSOL Multiphysics to conduct the simulative validation of the proposed method firstly and physical experiments are conducted then. The experiment results show the average relative error of water fraction is lower than 15%, where the even as low as 3.68%.

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“…Zhang and Yin [16] proposed a new method for determining the weighting factors of parallel model (PM) and series model (SM) sensitivity matrices, forming a mixed normalization model sensitivity matrix to improve the accuracy and shape fidelity of reconstructed images. Tang et al [17] pointed out that the electrical capacitance tomography (ECT) sensitivity coefficient can be expressed as the superposition of two components, and by considering the distribution of charge and dielectric constant at the same time, the influence of dielectric charging on image reconstruction can be suppressed.…”

Section: Introductionmentioning

confidence: 99%

EMT Image Reconstruction Based on Composite Sensitivity Matrix and Its Application in Defect Detection of Carbon Fiber Wound Hydrogen Tank

Ma¹,

Zhang²,

Liu³

et al. 2023

PIER M

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Carbon fiber wound hydrogen tanks are widely used in the field of new energy, but their complex multilayer structure makes it difficult to conduct nondestructive testing/structural health monitoring (NDT/SHM). In this paper, electromagnetic tomography (EMT) is used for noncontact in situ defect detection on a carbon fiber wound hydrogen tank. According to its structural characteristics, an open U-shaped sensor array that fits the curvature of the tank body is designed. To improve the quality of reconstructed images, an iterative image reconstruction algorithm based on a composite sensitivity matrix (CSM) is proposed. To verify the performance of the method, the method in this paper is compared with linear back projection (LBP), Landweber iterative algorithm, and the Tikhonov regularization algorithm, and the image quality is evaluated by comparing the image relative error and correlation coefficient. Both simulated and experimental results show that the method proposed in this paper is more accurate in defect localization and higher in quality than traditional image reconstruction algorithms.

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Composite Sensitivity Matrix for Reducing the Influence of Medium Electrification on Electrical Capacitance Tomography

Cited by 11 publications

References 28 publications

A CV weighted method for oil-water two-phase flow of non-contact multi-frequency el7ectrical impedance tomography

A CV weighted method for oil-water two-phase flow of non-contact multi-frequency el7ectrical impedance tomography

A Water Fraction Measurement Method Using Heuristic-Algorithm-Based Electrical Capacitance Tomography Images Post-Processing Technology

EMT Image Reconstruction Based on Composite Sensitivity Matrix and Its Application in Defect Detection of Carbon Fiber Wound Hydrogen Tank

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