Effects of particle charging on electrical capacitance tomography system

Gao, Heming; Xu, Chen; Fu, Feifei; Wang, Shimin

doi:10.1016/j.measurement.2011.11.007

Cited by 17 publications

(7 citation statements)

References 16 publications

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“…In EIT the spatial distribution of the electrical conductivity is reconstructed from the boundary data collected by an alternating current injection at the domain boundary. In some applications the electrical permittivity of the DUT is reconstructed from the voltage current data collected at the boundary and the imaging modality is called electrical capacitance tomography (ECT) [ 125 , 133 , 167 , 168 ] which is generally used in industrial process application and mechanical and material engineering. The electrical resistivity of the domain under test is sometimes reconstructed from the boundary data generated by a direct current injection in industrial process imaging, civil structure imaging, subsurface imaging, and other applications of geotechnology.…”

Section: Electrical Impedance Tomography (Eit)mentioning

confidence: 99%

Bioelectrical Impedance Methods for Noninvasive Health Monitoring: A Review

Bera

2014

Journal of Medical Engineering

314

189

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Under the alternating electrical excitation, biological tissues produce a complex electrical impedance which depends on tissue composition, structures, health status, and applied signal frequency, and hence the bioelectrical impedance methods can be utilized for noninvasive tissue characterization. As the impedance responses of these tissue parameters vary with frequencies of the applied signal, the impedance analysis conducted over a wide frequency band provides more information about the tissue interiors which help us to better understand the biological tissues anatomy, physiology, and pathology. Over past few decades, a number of impedance based noninvasive tissue characterization techniques such as bioelectrical impedance analysis (BIA), electrical impedance spectroscopy (EIS), electrical impedance plethysmography (IPG), impedance cardiography (ICG), and electrical impedance tomography (EIT) have been proposed and a lot of research works have been conducted on these methods for noninvasive tissue characterization and disease diagnosis. In this paper BIA, EIS, IPG, ICG, and EIT techniques and their applications in different fields have been reviewed and technical perspective of these impedance methods has been presented. The working principles, applications, merits, and demerits of these methods has been discussed in detail along with their other technical issues followed by present status and future trends.

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Section: Electrical Impedance Tomography (Eit)mentioning

confidence: 99%

Bioelectrical Impedance Methods for Noninvasive Health Monitoring: A Review

Bera

2014

Journal of Medical Engineering

314

189

View full text Add to dashboard Cite

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“…The low and high relative permittivity for calibration materials inside the sensor are 1.0 and 4.0, respectively. In reference [ 14 ], the author drew a conclusion that the greater capacitance differences are produced on the electrode-pairs whose detection electrodes are closer to the charge. Among these electrode-pairs, the greatest electrostatic effect exists on the adjacent ones near the charge.…”

Section: Effects Of Electrification Phenomenon On Ect Using Simulamentioning

confidence: 99%

“…Kanazawa et al [ 13 ] researched the generation and accumulation mechanism of the charge on the inner surface of a powder transport pipe and drew a conclusion that the charge density and polarity actually depended on the successive number of tests and the pipe material. Gao et al [ 14 ] investigated the electrostatic effect on alternating current (AC)-based ECT by simulations and experiments, and an ECT combined with an electrostatic tomography system (EST) was used to verify theoretical analysis. These work proved the fact that particle charge has influences on the capacitance measurement.…”

Section: Introductionmentioning

confidence: 99%

An AST-ELM Method for Eliminating the Influence of Charging Phenomenon on ECT

Wang

Jia

et al. 2017

Sensors

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Electrical capacitance tomography (ECT) is a promising imaging technology of permittivity distributions in multiphase flow. To reduce the effect of charging phenomenon on ECT measurement, an improved extreme learning machine method combined with adaptive soft-thresholding (AST-ELM) is presented and studied for image reconstruction. This method can provide a nonlinear mapping model between the capacitance values and medium distributions by using machine learning but not an electromagnetic-sensitive mechanism. Both simulation and experimental tests are carried out to validate the performance of the presented method, and reconstructed images are evaluated by relative error and correlation coefficient. The results have illustrated that the image reconstruction accuracy by the proposed AST-ELM method has greatly improved than that by the conventional methods under the condition with charging object.

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“…The need to analyse the interaction between modalities (e.g. the effect of particle charging) that may adversely affect image quality was also indicated (Gao et al, 2012).…”

Section: Possibilities Of Temperature Distribution Analysis Using Ectmentioning

confidence: 99%

Applications of Electrical Capacitance Tomography for Research on Phenomena Occurring in the Fluidised Bed Reactors

Porzuczek¹

2014

Chemical and Process Engineering

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The paper presents a review of current achievements in the Electrical Capacitance Tomography (ECT) in relation to its possible applications in the study of phenomena occurring in fluidised bed reactors. Reactors of that kind are being increasingly used in chemical engineering, energetics (fluidised bed boilers) or industrial dryers. However, not all phenomena in the fluidised bed have been thoroughly understood. This results in the need to explore and develop new research methods. Various aspects of ECT operation and data processing are described with their applicability in scientific research. The idea for investigation of temperature distribution in the fluidised bed, using multimodal tomography, is also introduced. Metrological requirements of process tomography such as sensitivity, resolution, and speed of data acquiring are noted.

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Effects of particle charging on electrical capacitance tomography system

Cited by 17 publications

References 16 publications

Bioelectrical Impedance Methods for Noninvasive Health Monitoring: A Review

Bioelectrical Impedance Methods for Noninvasive Health Monitoring: A Review

An AST-ELM Method for Eliminating the Influence of Charging Phenomenon on ECT

Applications of Electrical Capacitance Tomography for Research on Phenomena Occurring in the Fluidised Bed Reactors

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