Journal Article10.1049/EL:19990246
Electrical capacitance tomography with square sensor
Wuqiang Yang,Shu-Man Liu +1 more
77
TL;DR: In this paper, the Laplace equation is solved using a finite difference method to generate sensitivity maps, and both linear back-projection and an iterative algorithm have been implemented for image reconstruction.
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Abstract: Electrical capacitance tomography (ECT) with circular sensors has previously been investigated. For some industrial applications such as circulating fluidised beds, square sensors are required. Research into this specific area has been carried out for the first time. To generate sensitivity maps, the Laplace equation is solved using a finite difference method. Both the linear back-projection algorithm and an iterative algorithm have been implemented for image reconstruction. Experimental results are promising.
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Citations
Design of electrical capacitance tomography sensors
TL;DR: In this article, the authors discuss the principles of ECT sensors, but mostly focus on key issues for ECT sensor design, with reference to some existing ECT-based sensors as a good understanding of the key issues would help optimization of the design of the sensor.
367
Optimization of an iterative image reconstruction algorithm for electrical capacitance tomography
Shu-Qing Liu,L Fu,Wuqiang Yang +2 more
TL;DR: In this article, a method to determine the optimal step length for an iterative algorithm is proposed for electrical capacitance tomography, and the efficiency of the method has been demonstrated experimentally.
154
Role of tomography in gas/solids flow measurement
Wuqiang Yang,Shi Liu +1 more
TL;DR: In this paper, electrical capacitance tomography (ECT) was used for gas/solids flow measurement and the results showed that the flow regime can be identified, the solids fraction and velocity profiles can be derived, and the volumetric flow rate can be measured.
112
Evaluation of Effect of Number of Electrodes in ECT Sensors on Image Quality
TL;DR: In this article, the effect of the number of electrodes on the quality of reconstructed images was investigated using the projected Landweber iteration algorithm based on both linear and semi-linear ECT models.
110
Investigation of batch fluidized-bed drying by mathematical modeling, CFD simulation and ECT measurement
TL;DR: In this paper, a three-phase theory that describes the mass and heat transfer between the air and solids phases is used to develop an understanding of batch fluidized-bed drying, which is a complex air-solids, multiphase process.
107
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An image-reconstruction algorithm based on Landweber's iteration method for electrical-capacitance tomography
TL;DR: In this paper, a modified Landweber iteration method is proposed to enhance the quality of the image when two distinct phases are present, and a simple constraint is used as a regularization for computing a stabilized solution, with better immunity to noise and faster convergence.
558
Solids Flow Imaging and Attrition Studies in a Pneumatic Conveyor
TL;DR: In this paper, the first application of a non-invasive capacitance tomographic technique to monitoring the behaviour of industrial-scale pneumatic conveyors was described, and the results showed that particle breakage rates are inversely related to the solids loading factor.
83
Measurement of sensitivity distributions of capacitance tomography sensors
Wuqiang Yang,W. F. Conway +1 more
TL;DR: In this paper, the linear back-projection algorithm was used to reconstruct cross sectional images, the processing of which required sensitivity maps for all electrode pairs, which were obtained by finite element analysis with accuracy limited by available data on sensor geometry.
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