scholarly journals Investigation of Multi-Plane Scheme for Compensation of Fringe Effect of Electrical Resistance Tomography Sensor

Sensors ◽  
2019 ◽  
Vol 19 (14) ◽  
pp. 3132 ◽  
Author(s):  
Wenbin Tian ◽  
Xiaofeng Liang ◽  
Xiaolei Qu ◽  
Jiangtao Sun ◽  
Shuo Gao ◽  
...  
Keyword(s):  
Electrical Resistance ◽  
Electrical Resistance Tomography ◽  
Cross Sectional ◽  
Single Plane ◽  
Measurement Plane ◽  
3D Sensing ◽  
Simulation Results ◽  
Multiple Plane ◽  
Fringe Effect ◽  
Plane Scheme

Conventional electrical resistance tomography (ERT) sensors suffer from the fringe effect, i.e., severe distortion of the electric field on both ends of the measurement electrodes, leading to a 3D sensing region for a 2D sensor. As a result, the objects outside an ERT sensor plane affect the sensing and hence image, i.e., deteriorating the image quality. To address this issue, a multiple-plane ERT sensor scheme is proposed in this paper. With this scheme, auxiliary sensor planes are used to provide references for the fringe effect of the measurement plane, for compensation by subtracting the weighed influence of the fringe effect. Simulation results show that the proposed scheme, either three-plane or two-plane sensor, can compensate for the fringe effect induced by objects outside the measurement plane with a variety of axial object distributions, i.e., several non-conductive bars or conductive bars placed at different cross-sectional and axial positions inside the sensor. Experiments were carried out. Images obtained with single-plane and multiple-plane ERT sensors are compared, and the proposed compensation scheme has been hence verified.

Investigation of Transition Boundary and Nature of Pulsating Flow in the Trickle Bed Reactors by Electrical Resistance Tomography

2013 ◽  
Author(s):  
Takeshi Eda ◽  
Achyut Sapkota ◽  
Jun Haruta ◽  
Masayuki Nishio ◽  
Masahiro Takei
Keyword(s):  
Liquid Flow ◽  
Electrical Resistance ◽  
Flow Condition ◽  
Pulsating Flow ◽  
Fixed Bed Reactor ◽  
Electrical Resistance Tomography ◽  
Liquid Distribution ◽  
Cross Sectional ◽  
Transition Boundary ◽  
Trickle Bed

A fixed bed reactor that operates in gas-liquid co-current down flow is called Trickle Bed Reactor (TBR). It is widely used in chemical engineering. And, recently used in purification of radioactive contamination from contaminated water generated in the Fukushima Daiichi nuclear power plant. There are several flow conditions that occur in the TBR due to gas and liquid flow rate. Since mass and heat transfer rate and particles wetting depend on flow condition, it is necessary to establish the visualization techniques to understand flow condition, transition boundary and properties of gas liquid flow in TBR. In this study, authors employed the lab-scale TBR, made of 100mm inner diameter acrylic column, packed with particles of two sizes (3, 5 mm) that are used in the actual reactor. Water and air were injected from the top of the column and cross-sectional liquid distribution was captured at the bottom of the column by electrical resistance tomography (ERT). ERT is a tomographic technique that provides the cross-sectional conductivity distribution at the rate of about 50 frames per second by injecting current and measuring voltages between the 16 electrodes that are attached around the column. By analyzing the spatial and temporal characteristics of the liquid distribution obtained by ERT, it was found that particle size has only little impact on induction of pulsating flow and larger particle causes distinct pulses. Smaller particle causes blurred tiny pulses due to higher flow resistance. Larger particle (5 mm) is advantageous for pulsating flow.

A High Speed Current Pulse Electrical Resistance Tomography System for Dynamic Process Monitoring

Volume 1 ◽  
2004 ◽  
Author(s):  
E. W. Randall ◽  
A. J. Wilkinson ◽  
T. M. Long ◽  
A. Sutherland
Keyword(s):  
Current Pulse ◽  
Electrical Resistance ◽  
High Speed ◽  
Industrial Applications ◽  
Electrode System ◽  
Frame Rate ◽  
Manufacturing Cost ◽  
Electrical Resistance Tomography ◽  
Single Plane ◽  
Pulse Technique

This paper describes an instrument for Electrical Resistance Tomography (ERT) measurements based on a current pulse technique which has been shown by the authors to be a viable and easily implemented alternative to conventional AC excited systems. This system enables data to be acquired and recorded at 1000 frames/second on a single plane 16 electrode system and every 50th frame to be reconstructed and displayed to provide a real time display. The high frame rate enables transient phenomena to be investigated. The design incorporates a multiplexor allowing 8 rings of 16 electrodes to be sampled sequentially and thus provide data sets from all planes at 125 frames/second. This data can be processed to provide 3-D reconstructions and for velocity measurements using cross-correlation techniques. The system is primarily intended for use in minerals processing applications and data is presented from electrode systems used in slurry pipeline monitoring. It is suggested that simplified design and low manufacturing cost of the current pulse ERT systems will open the way for wide scale industrial applications.

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

2013 ◽  
pp. 97-102
Author(s):  
Lifeng Zhang
Keyword(s):  
Image Fusion ◽  
Electrical Resistance ◽  
Phase Flow ◽  
Cross Sectional ◽  
Three Phase ◽  
Three Phase Flow ◽  
Simulation Results ◽  
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.

Application of Electrical Resistance Tomography to Ice-Water Two-Phase Flow Parameters Measurement

2013 ◽  
Vol 562-565 ◽  
pp. 686-690 ◽  
Author(s):  
Jian Guo Zhang ◽  
Fu Chang Ma
Keyword(s):  
Electrical Resistance ◽  
Two Phase Flow ◽  
Phase Distribution ◽  
Medical Diagnostics ◽  
Phase System ◽  
Phase Flow ◽  
Electrical Resistance Tomography ◽  
Two Phase ◽  
Cross Sectional ◽  
Ice Water

Abstract. The pipeline transport system of ice-water mixed fluid applies widely (e.g., ice cold storage system). Ice-water two phase flow is a non-settlement flow with viscous particles. Due to its complexity and variability, the correct parameter measurement of ice-water two phase flow, in terms of ice packing factor (IPF) and phase distribution, is an extremely challenging task. Electrical resistance tomography (ERT) is a novel imaging technology that can display cross-sectional electrical conductivity distribution within a pipe by using a tomography reconstruction algorithm. Compared to computerized tomography (CT), which is a standard tool in medical diagnostics and non-destructive testing of materials, ERT has many advantages in cost, speed and safety. The work described here is to study and learn about ERT implementation in measurement parameters of ice-water two-phase flow. In experiment the reconstructed image clearly display the phase distribution of ice and water in two-phase system. The research results prove that it is possible to monitor on-line the transportation process of ice-water two-phase flow using ERT system.

scholarly journals Optimisation of Sensor Electrode Size for in Electrical Resistance Tomography Implementing Conducting Boundary Strategy

2021 ◽  
Vol 1874 (1) ◽  
pp. 012077
Author(s):  
Suzanna Ridzuan Aw ◽  
Ruzairi Abdul Rahim ◽  
Fazlul Rahman Mohd Yunus ◽  
Mohd Hafiz Fazalul Rahiman ◽  
Yasmin Abdul Wahab ◽  
...  
Keyword(s):  
Electrical Resistance ◽  
Electrical Resistance Tomography ◽  
Electrode Size ◽  
Sensor Electrode
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