Review of Selected Advances in Electrical Capacitance Volume Tomography for Multiphase Flow Monitoring

Rasel, Rafiul K.; Chowdhury, Shah M.; Marashdeh, Qussai M.; Teixeira, F.L.

doi:10.3390/en15145285

Cited by 18 publications

(5 citation statements)

References 81 publications

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“…However, during image reconstruction, the real-time performance of more complex algorithms is poor and conventional algorithms is difficult to guarantee accuracy. Additionally, the challenges associated with detecting weak capacitance and the soft field characteristics of capacitance measurement [57,58] have yet to be addressed. Hence, this method remains in the progress of laboratory research, which cannot be applied in practical engineering.…”

Section: Electrical Capacitance Tomographymentioning

confidence: 99%

Status Quo and Prospect of Oil-Water Two-phase Flow Detection Technology in Petrochemical Pipeline Network

Shaolin

2023

PPS

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In petrochemical production, the flow of oil-water mixture in pipelines is a common phenomenon referred to as oil-water two-phase flow. The main purpose of oil-water two-phase flow detection is to detect the proportion of oil or water in the liquid to be tested, which is significant for crude oil extraction, storage and transportation and even sales. This article analyzes the impact of complex environments on the detection results of oil-water two-phase flow and introduces the basic principle of oil or water content detection methods in oil-water two-phase flow detection as well as the applicability, advantages and disadvantages of various detection methods. Then the domestic and foreign scholars' efforts toward the fundamentals are briefly introduced. Finally, existing methods are summarized, together with research trends for oil-water two-phase flow.

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Section: Electrical Capacitance Tomographymentioning

confidence: 99%

Status Quo and Prospect of Oil-Water Two-phase Flow Detection Technology in Petrochemical Pipeline Network

Shaolin

2023

PPS

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“…On the one hand, adding independent capacitance measurements leads to less ill-posed equations [6]. Increasing the measurement electrodes [7][8][9][10][11] is a common way to increase the measurement data. Increasing the number of electrodes means reducing the size of electrodes.…”

Section: Introductionmentioning

confidence: 99%

Investigation of spatial resolution of electrical capacitance tomography based on the electromagnetic momentum (ECT-EMM)

Yang,

Liu,

Liu

2024

Meas. Sci. Technol.

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Electrical capacitance tomography (ECT) is a permittivity imaging method widely used in industrial inspection. The equations described by the ECT technique are nonlinear and ill-posed, which results in low image resolution. ECT can be considered an imaging method based on the Green’s reciprocity theorem, an energetic reciprocity theorem. ECT detects scalars, i.e. capacitances. Electromagnetic fields have both "energy" and "momentum." In recent years, the electromagnetic momentum reciprocity theorem has enriched the electromagnetic reciprocity theorem. The electromagnetic momentum reciprocity theorem is an imaging method that detects vectors, i.e. capacitance gradients. Vectors contain richer information than scalars; thus, electrical capacitance tomography based on electromagnetic momentum (ECT-EMM) methods is expected to improve the resolution of permittivity imaging. This paper briefly describes the principle of the ECT-EMM technique for image reconstruction using sensitivity matrix gradient and capacitance gradient. Tikhonov regularisation algorithm is applied. The two methods, with and without capacitance measurements, are used to evaluate imaging resolution. Under different numbers of pixels and electrodes, typical permittivity distributions are used for reconstruction, and correlation coefficients are calculated. Simulations and experiments show that the ECT-EMM technique recognises object boundaries more clearly with high noise immunity. Five quality measures are used to evaluate the performance of the point spread function (PSF) without capacitance measurements. Compared to ECT, the ECT-EMM technique is more sensitive to the central region away from the electrodes, recognises smaller minimum objects, and has smaller shape deformation.

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“…A disadvantage is the comparatively low imaging quality, which stems from the soft-field nature of the electric fields within the sensor. Yet, despite the comparatively low imaging quality, electrical tomography systems have seen emerging use as underlying instruments in measurement, e.g., for flow metering of particulate matter in pneumatic conveying [19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Efficient Jacobian Computations for Complex ECT/EIT Imaging

Neumayer,

Suppan,

Bretterklieber

et al. 2024

Mathematics

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The reconstruction of the spatial complex conductivity σ+jωε0εr from complex valued impedance measurements forms the inverse problem of complex electrical impedance tomography or complex electrical capacitance tomography. Regularized Gauß-Newton schemes have been proposed for their solution. However, the necessary computation of the Jacobian is known to be computationally expensive, as standard techniques such as adjoint field methods require additional simulations. In this work, we show a more efficient way to computationally access the Jacobian matrix. In particular, the presented techniques do not require additional simulations, making the use of the Jacobian, free of additional computational costs.

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Review of Selected Advances in Electrical Capacitance Volume Tomography for Multiphase Flow Monitoring

Cited by 18 publications

References 81 publications

Status Quo and Prospect of Oil-Water Two-phase Flow Detection Technology in Petrochemical Pipeline Network

Status Quo and Prospect of Oil-Water Two-phase Flow Detection Technology in Petrochemical Pipeline Network

Investigation of spatial resolution of electrical capacitance tomography based on the electromagnetic momentum (ECT-EMM)

Efficient Jacobian Computations for Complex ECT/EIT Imaging

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