An introduction of two differential excitation potentials technique in electrical capacitance tomography

Mohamad, Elmy Johana; Rahim, Ruzairi Abdul; Leow, Pei Ling; Rahiman, Mohd Hafiz Fazalul; Marwah, Omar Mohd Faizan; Ayob, Nor Muzakkir Nor; Rahim, Herlina Abdul; Yunus, Fazlul Rahman Mohd

doi:10.1016/j.sna.2012.03.025

Cited by 20 publications

(10 citation statements)

References 9 publications

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“…Electrical process tomography produces low resolution cross-sectional images, based on the measured data of permittivity and conductivity. A detail study on electrical tomography has been reported by Xie et al [13], York [14], Tapp et al [15], Marashdeh et al [16], Cao et al [17], and Mohamad et al [18]. Among the sensing methods of process tomography, electrical process tomography including EIT and ECT is more popular in recent years.…”

Section: Types Of Process Tomography Techniquesmentioning

confidence: 99%

Initial Study of a Wire Mesh Tomography Sensor for Liquid/Gas Component Investigation

Rahiman

Siow

Rahim³

et al. 2015

Journal of Electrical Engineering and Technology

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-Experimental studies have been carried out to study the principle operation of the conductive type wire-mesh tomography sensor and analyse the wire-mesh tomography sensor for the liquid/gas two-phase flow interface and void fraction distribution in a process column. The measurement of the two-phase flows in the process column is based on the cross-sectional local instantaneous conductivity. The sensor consists of two planes of parallel electrode wires with 16 electrodes each and was placed orthogonally with each plane. The sensor electrode wires were made of tinned copper wire with an outer diameter of 0.91 mm which stretched over the sensor fixture. Therefore, this result in the mesh grid size with 5.53×5.53mm 2 . The wire-mesh sensor was tested in a horizontal liquid/gas two-phase flows process column with nominal diameter of 95.6 mm and the sampling frequency of 5882.3529 Hz. The tomogram results show that the wire-mesh tomography provides significant results to represent the void fraction distribution in the process column and estimation error was found in the liquid/gas interface level.

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Section: Types Of Process Tomography Techniquesmentioning

confidence: 99%

Initial Study of a Wire Mesh Tomography Sensor for Liquid/Gas Component Investigation

Rahiman

Siow

Rahim³

et al. 2015

Journal of Electrical Engineering and Technology

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“…6, the electric field lines curve around the oil bubble in accordance to its position and size as there are difference in permittivity value between oil and water. In an ECT system, the excitation sequence as well as its frequency and voltage level influence the accuracy of the measurement [55]. In previous ECT system the excitation signal is a sine wave of 5 V peak-to-peak amplitude and 500 Hz frequency.…”

Section: Resultsmentioning

confidence: 99%

“…The measured capacitance when 3.3 V signal applied to the excitation electrode is lower than when 5 V voltage is applied. However, as stated in [55], the accuracy of the measurement does not only depends on the measured signal level but also to the uniform distribution of the signals. When 5 V signal is applied, the difference between the highest and the lowest signal received is 1.1 nF meanwhile the difference between the highest and the lowest signal received when 3.3 V signal applied is 7.23 pF.…”

Section: Resultsmentioning

confidence: 99%

Design of Crude Palm Oil Monitoring System using Electrical Capacitance Tomography: A Conceptual Framework

Ameran

Mohamad

Rahim³

et al. 2017

International Journal on Advanced Science, Engineering and Information Technology

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In Crude Palm Oil (CPO) milling operations, the oil flow that has gone through separation process must be tested for its purity as wastes (e.g. palm oil mill effluent, water, sludge) tend to get carried along the process pipeline. At present, this procedure usually takes up to 5 days as samples of the flow needed to be verified biologically for its composition. Electrical Capacitance Tomography (ECT) systems that are able to provide the cross-sectional images of a closed content has proven the possibility of monitoring the composition of CPO flow in online manner. ECT systems are also able to provide other crucial flow information such as its velocity and flow regime that could help in controlling the processes. In this paper, a brief literature review of existing ECT systems are presented, then a conceptual design for developing an ECT system for visualizing and measuring CPO flow are presented along with the decision process of choosing suitable technique and hardware types for the new ECT system for CPO monitoring. A preliminary simulation study of the capability of the designed system to reconstruct images of water-oil flow phantoms is also presented. The simulation results show that the designed system is capable of reconstructing phantom images with error lower than 30 %.

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“…Fig. 5 shows the specified values of the entries in the sensitivity matrix, where each data point represents the S ij calculated according to (14) along the width of the roll. Since the roll structure is continuous, pressure across the roll is not locally restricted but will affect regions adjacent to the individual capacitors.…”

Section: A Sensitivity Matrixmentioning

confidence: 99%

“…Such pressure in turn compresses the dielectric layer at the location of the electrodes on the sensing rod, leading to an increase of the capacitance that is subsequently measured by the sensing electronics and converted to pressure values computationally [13] by a back projection-based algorithm [14]- [15]. To understand the thermal effect caused by electrical pulses on the embedded sensor and electronics, finiteelement (FE) analysis of the sensor-embedded roll is performed to quantify the temperature distribution during the rolling process.…”

Section: Introductionmentioning

confidence: 99%

Embedded Capacitive Pressure Sensing for Electrically Assisted Microrolling

Fan

Zou

Gao

et al. 2015

IEEE/ASME Trans. Mechatron.

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This paper presents the design, characterization, and experimental evaluation of a wireless capacitive pressure sensor embedded within a rotating workroll of a microrolling machine for monitoring the production of micrometer-scaled texture on thin metallic workpiece. The sensor converts the spatial and temporal variations of pressure across the interface between the roll and workpiece into capacitance values, thereby experimentally establishing a quantitative correlation between the online measurement and the geometric features being formed on the workpiece, in real time. Analytical and numerical models have been developed to guide the design of the sensor to maximize the capacitance output while satisfying the space constraint. A sensitivity matrix linking the measured capacitance with pressure distribution has been established through numerical analysis. Simulation and experiments confirmed the effectiveness of the embedded sensor in enabling intelligent microrolling.Index Terms-Electrically assisted microrolling, embedded sensing, modeling, online monitoring.

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An introduction of two differential excitation potentials technique in electrical capacitance tomography

Cited by 20 publications

References 9 publications

Initial Study of a Wire Mesh Tomography Sensor for Liquid/Gas Component Investigation

Initial Study of a Wire Mesh Tomography Sensor for Liquid/Gas Component Investigation

Design of Crude Palm Oil Monitoring System using Electrical Capacitance Tomography: A Conceptual Framework

Embedded Capacitive Pressure Sensing for Electrically Assisted Microrolling

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