scholarly journals Limited Angle Electrical Resistance Tomography in Wastewater Monitoring

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 1899 ◽  
Author(s):  
Chenning Wu ◽  
Martin Hutton ◽  
Manuchehr Soleimani
Keyword(s):  
Electrical Resistance ◽  
High Speed ◽  
Low Cost ◽  
Radiation Hazard ◽  
Reconstruction Method ◽  
Limited Data ◽  
Electrical Resistance Tomography ◽  
Limited Region ◽  
Image Reconstruction Method ◽  
High Speed Design

Electrical resistance tomography (ERT) has been investigated in monitoring conductive flows due to its high speed, non-intrusive and no radiation hazard advantages. Recently, we have developed an ERT system for the novel application of smart wastewater metering. The dedicated low cost and high-speed design of the reported ERT device allows for imaging pipes with different flow constituents and monitoring the sewer networks. This work extends the capability of such a system to work with partially filled lateral pipes where the incomplete data issue arises due to the electrodes losing contact with the conductive medium. Although the ERT for such a limited region has been developed for many years, there is no study on imaging content within these limited regions. For wastewater monitoring, this means imaging the wastewater and solid inclusions at the same time. This paper has presented a modified ERT system that has the capacity to image inclusions within the conductive region using limited data. We have adjusted the ERT hardware to register the information of the non-contact electrodes and hence the valid measurements. A limited region image reconstruction method based on Jacobian reformulation is applied to gain robustness when it comes to inclusion recovery in limited data ERT. Both simulation and experimental results have demonstrated an enhanced performance brought by the limited region method in comparison to the global reconstruction.

Application Study on Bubble Detection in a Metallic Bubble Column Using Electrical Resistance Tomography

2014 ◽  
Vol 69 (8) ◽  
Author(s):  
Suzanna Ridzuan Aw ◽  
Ruzairi Abdul Rahim ◽  
Mohd Hafiz Fazalul Rahiman ◽  
Fazlul Rahman Mohd Yunus ◽  
Naizatul Shima Fadzil ◽  
...  
Keyword(s):  
Electrical Resistance ◽  
Bubble Column ◽  
Low Cost ◽  
Radiation Hazard ◽  
Process Equipment ◽  
Electrical Resistance Tomography ◽  
Application Study ◽  
Bubble Detection ◽  
Fundamental Process ◽  
Metal Wall

Electrical resistance tomography (ERT) has been chosen as the field of study because of its advantages of being low cost, suitable for various kinds and sizes of pipes and vessels, having no radiation hazard, and being non-intrusive. In the development of ERT systems for metallic bubble column, prior knowledge of the fundamental process of the ERT system whilst improving the design and operation of the process equipment is essential. The fabricated electrodes need to be electrically insulated from the metal wall. Besides that, conducting boundary strategy is implemented to overcome the grounding effect of the metallic vessel.

Front-End Circuit in Electrical Resistance Tomography (ERT) for Two-Phase Liquid and Gas Imaging

2014 ◽  
Vol 70 (3) ◽  
Author(s):  
F. R. Mohd Yunus ◽  
R. Abdul Rahim ◽  
Suzanna Ridzuan Aw ◽  
N. M. Nor Ayob ◽  
M. P. Jayasuman ◽  
...  
Keyword(s):  
Electrical Resistance ◽  
High Speed ◽  
Low Cost ◽  
Bubble Radius ◽  
Current Source ◽  
Electrical Resistance Tomography ◽  
Two Phase ◽  
2D Simulation ◽  
Phase Liquid ◽  
Frequency Changes

A steady and precise Voltage Control Current Source (VCCS ) with broad bandwidth plays a very important role in the quality of final images for the Electrical Resistance Tomography (ERT) system. Therefore, a model of current source is proposed in the paper which implement advanced Howland current pump as VCCS. The model are simulated through a software named multisim, and the simulation results show the proposed high-speed operational amplifier (op-amp) LM7171 is capable to produce constant output current at 10 mA (peak) when the frequency changes between 1 kHz to 500 kHz with load varies from 10 Ω to 1 kΩ. A two-dimensional (2D) simulation was performed using COMSOL and the results showed that the model is capable to detect air bubble (radius=10 mm) in a two-phase liquid and gas. The result presented with opposite excitation method with 150 kHz current at 10 mA. The measurement of boundary potentials are significantly influenced by bubble positions particularly towards the boundary. They are hoped to provide useful approaches for the design of practical and low-cost VCCS in ERT system.

Automated Confluence Measurement Method for Mesenchymal Stem Cell from Brightfield Microscopic Images

2021 ◽  
pp. 1-9
Author(s):  
Zenan Wang ◽  
Rucai Zhan ◽  
Ying Hu
Keyword(s):  
Cell Culture ◽  
Phase Contrast ◽  
Low Cost ◽  
Cost Effective ◽  
Cell Phenotype ◽  
Cell Culture Process ◽  
Reconstruction Method ◽  
Image Reconstruction Method ◽  
Contrast Microscope ◽  
Culture Process

Cell confluence is an important metric in cell culture, as proper timing is essential to maintain cell phenotype and culture quality. To estimate cell confluence, transparent cells are observed under a phase-contrast or differential interference contrast microscope by a biologist, whose estimations are error-prone and subjective. To overcome the necessity of using the phase-contrast microscope and reducing intra- and inter-observer errors, we have proposed an algorithm that automatically measures cell confluence by using a commonly used brightfield microscope. The proposed method consists of a transport-of-intensity equation-based brightfield microscopic image processing, an image reconstruction method, and an adaptive image segmentation method based on edge detection, entropy filtering, and range filtering. Experimental results have shown that our method has outperformed several popular algorithms, with an F-score of 0.84 ± 0.07, in images with various cell confluence values. The proposed algorithm is robust and accurate enough to perform confluence measurement with various lighting conditions under a low-cost brightfield microscope, making it simple and cost-effective to use for a fully automated cell culture process.

Simulation Study of Tuber Electrical Resistance Tomography System

2014 ◽  
Vol 577 ◽  
pp. 705-708
Author(s):  
Xiang Deng ◽  
Lu Chen ◽  
Zhao Dong ◽  
Hao Liu
Keyword(s):  
Electrical Resistance ◽  
Low Cost ◽  
Tuber Growth ◽  
Electrical Resistance Tomography ◽  
Main Research ◽  
Growth Status ◽  
Status Monitoring ◽  
Tomography System ◽  
New Varieties ◽  
Non Destructive

The fast non-destructive inspection of plant tubers or roots is a big problem in the plant accurate cultivation. With the characteristic of non-invasion, low cost, no radiation and visualization, the electrical resistance tomography technology is applied to the research of agriculture field; therefore it can be used in the tuber growth status monitoring, new varieties nurturing and fine cultivation of plants. The main research contents include: establish the sensitive model and simulate by using COMSOL software; the affects brought by different positions and sizes of one tuber are studied in detail and the research of effects of tuber number on electrical properties is carried out. The research has crucial guidance for the further study of the TERT technology.

Experimental Investigation of Volume Fraction in an Annulus Using Electrical Resistance Tomography

SPE Journal ◽  
2019 ◽  
Vol 24 (05) ◽  
pp. 1947-1956 ◽  
Author(s):  
Syed Raza Rehman ◽  
Alap Ali Zahid ◽  
Anwarul Hasan ◽  
Ibrahim Hassan ◽  
Mohammad A. Rahman ◽  
...  
Keyword(s):  
Multiphase Flow ◽  
Electrical Resistance ◽  
High Speed ◽  
Volume Fraction ◽  
Flow Behavior ◽  
Complex Flow ◽  
Flow Loop ◽  
Electrical Resistance Tomography ◽  
Horizontal Drilling ◽  
Hole Cleaning

Summary Horizontal drilling technology has shown to improve the production and cost–effectiveness of the well by generating multiple extraction points from a single vertical well. The efficiency of hole cleaning is reduced because of the solid–cuttings accumulation in the annulus in cases of extended–reach drilling. It is difficult to study the complex flow behavior in a drilling annulus using the existing visualization techniques. In this study, experiments were carried out in the multiphase flow–loop system consisting of a simulated drilling annulus using electrical resistance tomography (ERT) and a high–speed camera. Real–time tomographic images (quantitative visualization) of multiphase flow from ERT were compared to the actual photographs of the flow conditions in a drilling annulus. The quantitative analysis demonstrates that ERT has a wide potential application in studying the hole–cleaning issues in the drilling industry.

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