Development of capacitance tomographic imaging systems for oil pipeline measurements

Yang, Wuqiang; Stott, A.L.; Beck, M.S.; Xie, Chenggang

doi:10.1063/1.1145322

Cited by 110 publications

(30 citation statements)

References 12 publications

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“…Represented by Capacitance Tomography (ECT), "Process tomography" has attracted great attention since 1980s [43] [44] [45], and the research in this area has made significant progress. Besides ECT, there are many different types of tomographic techniques such as Electrical impedance tomography (EIT), optical tomography and Electrostatic Tomography [46].…”

Section: Est (Electrostatic Tomography)mentioning

confidence: 99%

Air-Solids Flow Measurement Using Electrostatic Techniques

Zhang¹

2012

Electrostatics

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Section: Est (Electrostatic Tomography)mentioning

confidence: 99%

Air-Solids Flow Measurement Using Electrostatic Techniques

Zhang¹

2012

Electrostatics

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“…ECS is one of the most mature and promising methods, which measures the capacitance change of multi-electrode sensor due to the change of dielectric permittivity being imaged, and then reconstructs the cross-section images using the measured raw data with a suitable algorithm. It has the characteristics such as low cost, fast response, non-intrusive method, broad application, safety (Yang et al 1995a, b, Li and Huang 2000, Mohamad, Rahim et al 2012and Zhang, Wang et al 2014). Electrical capacitance system includes sensor, capacitance measuring circuit and imaging computer is shown in Fig.…”

Section: Electrical Capacitance Sensor (Ecs)mentioning

confidence: 99%

The thermal effect on electrical capacitance sensor for two-phase flow monitoring

Altabey¹

2016

Structural Monitoring and Maintenance

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One of major errors in flow rate measurement for two-phase flow using an Electrical Capacitance Sensor (ECS) concerns sensor sensitivity under temperature raise. The thermal effect on electrical capacitance sensor (ECS) system for air-water two-phase flow monitoring include sensor sensitivity, capacitance measurements, capacitance change and node potential distribution is reported in this paper. The rules of 12-electrode sensor parameters such as capacitance, capacitance change, and change rate of capacitance and sensitivity map the basis of Air-water two-phase flow permittivity distribution and temperature raise are discussed by ANSYS and MATLAB, which are combined to simulate sensor characteristic. The cross-sectional void fraction as a function of temperature is determined from the scripting capabilities in ANSYS simulation. The results show that the temperature raise had a detrimental effect on the electrodes sensitivity and sensitive domain of electrodes. The FE results are in excellent agreement with an experimental result available in the literature, thus validating the accuracy and reliability of the proposed flow rate measurement system.

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“…As a novel non-destructive testing (NDT) technique, CI has been used for oil pipelines, storage tanks, nuclear power stations and new armor in recent years [14][15][16][17][18]. It has many advantages, such as easy to implement, cost effective, environment friendly and non-contact [10,12].…”

Section: Introductionmentioning

confidence: 99%

Further Investigations into the Capacitive Imaging Technique Using a Multi-Electrode Sensor

Chen

et al. 2018

Applied Sciences

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As a novel non-destructive testing technique, capacitive imaging (CI) has been used to detect defects within the insulation layer and metal surface of an insulated metallic structure, that is, pipe or vessel. Due to the non-linearity of the probing field, the defects at different depths in the insulation layer are difficult to compare accurately using the conventional CI sensor with a single pair of electrodes. In addition, the conventional CI sensor cannot provide adequate information to discriminate the defects in the insulation layer and metal surface. In order to solve the above-mentioned problems, the multi-electrode sensor is introduced. The multi-electrode sensor uses multiple quasi-static fringing electric fields generated by an array of coplanar electrodes to obtain extra information about the defects in the specimen. In this work, the feasibility of multiple quasi-static electric fields detecting the defects was demonstrated and the Measurement Sensitivity Distributions (MSDs) of the multi-electrode sensor detecting the defects were acquired using the FEM models. The simulation and experimental results show that the Dynamic Change Rates (DCRs) of the measured values obtained at the center of the defects in the insulator layer and metal surface present different variation patterns, which can be used to discriminate these two different kinds of defects. The reasons for the different variation patterns of DCRs were explained by the changing trends of MSDs with increased electrode separation. In addition, it was demonstrated that the different depths of the defects in the insulator layer can be compared accurately by comprehensive analysis of the detection results from all the electrode pairs.

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Development of capacitance tomographic imaging systems for oil pipeline measurements

Cited by 110 publications

References 12 publications

Air-Solids Flow Measurement Using Electrostatic Techniques

Air-Solids Flow Measurement Using Electrostatic Techniques

The thermal effect on electrical capacitance sensor for two-phase flow monitoring

Further Investigations into the Capacitive Imaging Technique Using a Multi-Electrode Sensor

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