Image reconstruction technique of electrical capacitance tomography for low-contrast dielectrics using Calderon's method

Cao, Zhang; Xu, Lijun; Wang, Huaxiang

doi:10.1088/0957-0233/20/10/104027

Cited by 51 publications

(28 citation statements)

References 21 publications

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“…Research on improving the imaging resolution in ECT and ECVT has focused primarily on image reconstruction algorithms and techniques [9][10][11][12]. Considerable less attention has been given to increasing the number of independent measurement channels (i.e., by considering different capacitance plate shapes, arrangements, and number).…”

Section: Introductionmentioning

confidence: 99%

Electrical Capacitance Volume Tomography: A Comparison Between 12- And 24-Channels Sensor Systems

Wang¹,

Marashdeh²,

Teixeira³

et al. 2015

PIER M

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Abstract-Spatial resolution represents a key performance aspect in electrical capacitance volume tomography (ECVT) systems. Factors affecting the resolution include the "soft-field" nature of ECVT, the number of capacitance channels used, the ill-conditioned nature of the imaging reconstruction problem, and the signal-to-noise ratio of the measurement apparatus. In this study, the effect of choosing different numbers of capacitance plates on the performance of ECVT is investigated experimentally. Specifically, two ECVT sensors with 12 and 24 capacitance channels but covering equal volumes of a cylinder are used to examine the resulting impact on the image resolution.

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Section: Introductionmentioning

confidence: 99%

Electrical Capacitance Volume Tomography: A Comparison Between 12- And 24-Channels Sensor Systems

Wang¹,

Marashdeh²,

Teixeira³

et al. 2015

PIER M

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“…The Calderon method is a linearized method and suitable for detection of low contrast dielectrics [31]. Full-field calibration data are not required by using the Calderon method.…”

Section: B Static Experiments Resultsmentioning

confidence: 99%

A High-Speed Digital Electrical Capacitance Tomography System Combining Digital Recursive Demodulation and Parallel Capacitance Measurement

et al. 2017

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Abstract-Two means can be used to improve the data acquisition rate of the ECT system with a fixed excitation frequency, i.e. improving the capacitance measurement speed or changing the capacitance measurement mode from serial to parallel. This paper presents a newly developed high-speed electrical capacitance tomography (ECT) system by combing digital recursive demodulation and parallel-mode capacitance measurement methods. By using the digital recursive demodulator, the time-cost for one time of capacitance measurement can be one period of the excitation sinusoid or less. By using the parallel-mode capacitance measuring unit, capacitances between the exciting electrode and all other measuring electrodes can be measured simultaneously. The data acquisition rate of the parallel-mode ECT system with a sensor of N electrodes is N-1 times of a traditional serial-mode ECT system with the same excitation frequency. When the excitation frequency is 100 kHz and 0.6 periods of data are used for signal demodulation, the data acquisition rate can reach up to 15150 frames per second. The developed system together with a heat-resisting circular ECT sensor with 12 electrodes was used to monitor the ignition process of a cylindrical flame generated by a Bunsen burner. Experimental results show that the ECT system can locate the position and capture the dynamic process of the flame with a high temporal resolution.

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“…In particular, Electrical Capacitance Tomography (ECT) systems have been the subject of recent research toward developing a safe, affordable, fast, and reliable industrial imaging tool (Cao et al, 2009;Wang et al, 2010). ECT has developed successfully after reconstruction of data into 3D from 2D, and currently 3D data reconstruction are able in the real time.…”

Section: Introductionmentioning

confidence: 99%

Comparisons of Sensor Position for Electrical Capacitance Volume Tomography (Ecvt)

Ahmad¹,

Mukhlisin²,

Basri³

2016

MAS

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Tomography is a technique used to produce true reconstructed images from signal data. This data projection is measured capacitance by numerous sensors located on the surface of the object at different position. Sensitivity matrix with three-dimensional variation, especially in axial (z-axiz) direction are required for imaging a three-dimensional object to differentiate the depth along the sensor length so that the electrical field intensity can be distributed equally all over the three dimension space. In ECVT, when a dielectric material is introduced into the vessel, the variation in the electrical capacitance between all possible combinations of electrodes are measured. These changes are caused by diference in the permittivity of that material. From these capacitance measurements, an image based on the variation of the permittivity of the cross section contents can be obtained. In this study a numerical model using combine COMSOL MULTIPHYSICS v3.5 and MATLAB 2008a for imaging of an object was developed. Three different position of rectangular sensor: 1-sided sensor, 3-sided and U-shape sensor was designed and analyzed. 1-sided sensor displayed comparatively more uniform in both radial and axial direction in the comparisons of sensitivity distribution.

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Image reconstruction technique of electrical capacitance tomography for low-contrast dielectrics using Calderon's method

Cited by 51 publications

References 21 publications

Electrical Capacitance Volume Tomography: A Comparison Between 12- And 24-Channels Sensor Systems

Electrical Capacitance Volume Tomography: A Comparison Between 12- And 24-Channels Sensor Systems

A High-Speed Digital Electrical Capacitance Tomography System Combining Digital Recursive Demodulation and Parallel Capacitance Measurement

Comparisons of Sensor Position for Electrical Capacitance Volume Tomography (Ecvt)

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