Analytical Method of Generating Sensitivity Map for Electrical Capacitance Tomography Sensor with Internal Electrode

2013 ◽  
Vol 339 ◽  
pp. 99-103
Author(s):  
Xiang Yuan Dong ◽  
Shu Qing Guo
Keyword(s):  
Dielectric Permittivity ◽  
Internal Structure ◽  
Analytical Method ◽  
Electrical Capacitance Tomography ◽  
Electrical Capacitance ◽  
High Quality ◽  
Internal Electrode ◽  
Sensitivity Map ◽  
Capacitance Tomography ◽  
Sensitivity Maps

Electrical capacitance tomography (ECT) is a developing technique for visualization of the dielectric permittivity distribution inside the pipe. Internal electrode or internal structure is frequently encountered issue. In this paper, an analytical method for the circular ECT sensor with internal electrode is proposed to calculate the potential distributions and generate the sensitivity maps. Simulated capacitance data are used to verify the proposed method. The results show that, by using the new method, it can reconstruct high quality images.

Investigation of the riser cross-sectional aspect ratio effect on the flow dynamics in circulating fluidized beds by electrical capacitance tomography

2019 ◽  
Vol 42 (4) ◽  
pp. 655-665
Author(s):  
Qiuya Y Tu ◽  
Haigang G Wang
Keyword(s):  
Aspect Ratio ◽  
Excitation Frequency ◽  
Electrical Capacitance Tomography ◽  
Circulating Fluidized Beds ◽  
Electrical Capacitance ◽  
Cross Sectional ◽  
Bed Height ◽  
Bottom Region ◽  
Sensitivity Map ◽  
Capacitance Tomography

With the increase of capacity, most of the circulating fluidized beds (CFB) risers are constricted to have rectangular cross section. Therefore, it is important to find out the cross-sectional aspect ratio effect on the gas-solids flow characteristics. In this study, a lab-scale CFB with two rectangular risers, which have the aspect ratio of 1:1 and 3:1, respectively, were studied by the electrical capacitance tomography (ECT), with the aided of pressure measurements and computational particle fluid dynamics (CPFD) simulation. Key issues related with ECT sensor design and image reconstruction, such as sensitivity map and excitation frequency, are also discussed. The results show that ECT image quality is affected by the sensitivity map and excitation frequency, and high excitation frequency and voltage are not equivalent of high image quality. In the riser bottom region, cross-sectional aspect ratio has big effect on ECT measured particle distribution and pressure drop, fewer particles are brought away from the bottom when the aspect ratio is larger. Multiple bubbles exist in the bottom region at Ve= 2.7 m/s, and bubble size decreases in the rectangular riser with larger cross-sectional aspect ratio. Static bed height influences the bubble behaviour that bubbles with smaller size scattered around and behave collapse or coalescence in the moving process when the static bed height is high.

Sensitivity map generation in electrical capacitance tomography using mixed normalization models

2007 ◽  
Vol 18 (7) ◽  
pp. 2092-2102 ◽  
Author(s):  
Yong Song Kim ◽  
Seong Hun Lee ◽  
Umer Zeeshan Ijaz ◽  
Kyung Youn Kim ◽  
Bong Yeol Choi
Keyword(s):  
Electrical Capacitance Tomography ◽  
Electrical Capacitance ◽  
Map Generation ◽  
Sensitivity Map ◽  
Capacitance Tomography

Optimum Design of an Internal 8-Electrode Electrical Capacitance Tomography Sensor Array

2012 ◽  
Vol 508 ◽  
pp. 84-87
Author(s):  
De Cai Lu ◽  
Fu Qun Shao ◽  
Ying Xia Cao
Keyword(s):  
Optimum Design ◽  
Sensor Array ◽  
Design Method ◽  
Electrical Capacitance Tomography ◽  
Electrical Capacitance ◽  
High Quality ◽  
Sensor Model ◽  
Grain Distribution ◽  
Optimal Design Method ◽  
Capacitance Tomography

This paper introduced an optimum design method of sensor array suitable for electrical capacitance tomography (ECT) based on high AC excitation voltage. The sensor parameters of electrode span and length were optimized in turn, and a sensor model for testing was fabricated according to optimal objects. The image reconstruction experimental resultants of grain distribution indicated that high quality images could be reconstructed by the sensor model. This proved the optimal design method of ECT sensor given in this paper was feasible and the parameters were also credible.

DESIGN OF FLEXIBLE ELECTRICAL CAPACITANCE TOMOGRAPHY SENSOR

2015 ◽  
Vol 77 (28) ◽  
Author(s):  
MT Masturah ◽  
MHF Rahiman ◽  
Zulkarnay Zakaria ◽  
AR Rahim ◽  
NM Ayob
Keyword(s):  
Outer Layer ◽  
Electrical Capacitance Tomography ◽  
Electrical Capacitance ◽  
Capacitance Tomography ◽  
Fluid Imaging

This paper discussed the design–functionality and application of Flexible Electrical Capacitance Tomography sensor (FlexiECT). The sensors consist of 12 electrodes allocated surrounding the outer layer of the pipeline. The sensor is designed in such that the flexibility features suit the applications in the pipeline of multiple size. This paper also discussed the preliminary result of FlexiECT applications in fluid imaging by identifying the percentage of two mixing fluids.

Dynamic water fill level measurement using a phantom-dependent adaptive electrical capacitance tomography (ECT) method

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Christoph Kandlbinder-Paret ◽  
Alice Fischerauer ◽  
Gerhard Fischerauer
Keyword(s):  
Pipe Wall ◽  
Electrical Capacitance Tomography ◽  
Electrical Capacitance ◽  
Capacitance Measurements ◽  
Level Measurement ◽  
Element Simulation ◽  
Fill Level ◽  
Capacitance Tomography ◽  
Low Permittivity ◽  
Adaptation Scheme

Abstract In electrical capacitance tomography (ECT), the resolution of the reconstructed permittivity distribution improves with the number of electrodes used whereas the number of capacitance measurements and the measurement time increases with the number of electrodes. To cope with this tradeoff, we present a phantom-dependent adaptation scheme in which coarse measurements are performed with terminal electrodes interconnected to form a synthetic electrode ring with fewer but larger electrodes. The concept was tested by observing the sloshing of water inside a pipe. We compare the reconstructed results based on eight synthetic electrodes, on 16 elementary electrodes, and on the adaptation scheme involving both the eight synthetic electrodes and some of the elementary capacitances. The reconstruction used the projected Landweber algorithm for capacitances determined by a finite-element simulation and for measured capacitances. The results contain artefacts attributed to the influence of the high permittivity of water compared to the low permittivity of the pipe wall. The adaptation scheme leads to nearly the same information as a full measurement of all 120 elementary capacitances but only requires the measurement of 30 % fewer capacitances. By detecting the fill level using a tomometric method, it can be determined within an uncertainty of 5 % FS.

Image Fusion of ECT/ERT for Oil-Gas-Water Three-Phase Flow

2011 ◽  
Vol 3 (2) ◽  
pp. 29-34 ◽  
Author(s):  
Lifeng Zhang
Keyword(s):  
Image Fusion ◽  
Electrical Capacitance Tomography ◽  
Phase Flow ◽  
Electrical Capacitance ◽  
Cross Sectional ◽  
Three Phase ◽  
Three Phase Flow ◽  
Capacitance Tomography ◽  
Oil Gas ◽  
Image Fusion Method

The tomographic imaging of process parameters for oil-gas-water three-phase flow can be obtained through different sensing modalities, such as electrical resistance tomography (ERT) and electrical capacitance tomography (ECT), both of which are sensitive to specific properties of the objects to be imaged. However, it is hard to discriminate oil, gas and water phases merely from reconstructed images of ERT or ECT. In this paper, the feasibility of image fusion based on ERT and ECT reconstructed images was investigated for oil-gas-water three-phase flow. Two cases were discussed and pixel-based image fusion method was presented. Simulation results showed that the cross-sectional reconstruction images of oil-gas-water three-phase flow can be obtained using the presented methods.

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