Electrical capacitance tomography with square sensor

Yang, Wuqiang; Liu, S.

doi:10.1049/el:19990246

Cited by 63 publications

(26 citation statements)

References 3 publications

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“…Specially, 1 Λ denotes the voltage-to-current density map when Ω contains a constant permittivity of one. Equation (3) can be rewritten as…”

Section: A Theory Basismentioning

confidence: 99%

“…However, square or rectangular CFBs are commonly applied in the power industry, and there is a demand on developing square ECT sensors. For this purpose, a square ECT sensor was constructed by Yang and Liu [1] and the corresponding sensitivity maps were obtained by numerical calculations. Shortly after, preliminary experimental results were reported by Liu and Yang [2].…”

Section: Introductionmentioning

confidence: 99%

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2D ECT with square sensor using Calderon's method

Cao

Wang

2009

2009 IEEE International Workshop on Imaging Systems and Techniques

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Calderon's method was introduced to electrical capacitance tomography with square sensor in this paper. It is a direct algorithm of the image reconstruction, as no matrix inversion or iterative process is needed. It was implemented through numerical integration. Since the Gauss-Legendre quadrature was applied and can be predetermined, the image reconstruction process was fast and resulted in images of good quality. Simulated results validated the feasibility and effectiveness of Calderon's method in electrical capacitance tomography with square sensor.

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“…Specially, 1 Λ denotes the voltage-to-current density map when Ω contains a constant permittivity of one. Equation (3) can be rewritten as…”

Section: A Theory Basismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

2D ECT with square sensor using Calderon's method

Cao

Wang

2009

2009 IEEE International Workshop on Imaging Systems and Techniques

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“…The γ-ray whose radioactivity was I after transmitting the pipeline wall and the measured medium irradiates the ionization chamber, the γ-ray and the gas in the ionization chamber make photoelectric effect and scattering, the secondary electron of the γ-ray make the gas produce cation and anion which flow to the positive and negative electrode respectively under the high-voltage direct current collecting voltage and the ionization current at 9 10 − connected by the positive and negative electrode was converted to voltage transmission signal by electrometer. Because the wall thickness was valuing, the γ-ray absorbed by the wall was constant.…”

Section: Ray Absorptionmentioning

confidence: 99%

Design and Experimental Study on the Pulverized Coal Concentration Sensor Based on Gamma-Ray Absorption Method

Duan

Liu

2008

2008 IEEE Pacific-Asia Workshop on Computational Intelligence and Industrial Application

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The device was developed to accurately measure the Concentration of pulverized coal in the pneumatic conveying pipe. The sensor assembly was composed of γray source, tube of the sensor, ionization chamber fill with inert gas electrometer and lead cannon tube shield. The γ point source was fixed at the cross-section centre of the pipe, the collimation exit portal was vertical to the axis line of the conduct, in which the outgoing beam of the γ rays was assumed at the plane 360°; the profile of the ionization chamber was designed ring cross section, independent mult-cavity. The γ-ray from the source penetrated the gas-solid two phase flow and the single tube wall, arrived at the corresponding independent cavity. The inert gas filled in the cavity was ionized by the γ-ray, the ions was collected by the high voltage plates, the ionic stream was converted into direct voltage by the electrometer in the cavity, as the output of the cavity .The concentration of the corresponding sector in the tube could be determined according to the law of γ-ray mutual effect with the matter. The arithmetic mean of the output voltages from the electrometers in the cavities of the ionization chamber was taken as the measured value of volume concentration of the pulverized coal in the tube. The proving trial shows that the input-output character of the sensor assembly was the phase distribution; the measuring accuracy was superior 2%,the the γ-ray radioactivity requirement was reduced obviously as only single tube wall was required to be penetrated by γ-ray.2008 IEEE Pacific-Asia Workshop on Computational Intelligence and Industrial Application 978-0-7695-3490-9/08 $25.00

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“…An extensive literature review shows that, the measurement sensitivity distribution of capacitive sensors has been regularly studied for electrical capacitance tomography (ECT) sensor [11,12], for which the knowledge of the sensitivity distribution is the key for image reconstruction [13,14]. However, only sporadic studies on the measurement sensitivity distribution on coplanar capacitive sensors can be found in literature [15] and it has not been systematically discussed.…”

Section: Introductionmentioning

confidence: 99%

Negative measurement sensitivity values of planar capacitive imaging probes

Yin

Chen

Hutchins

2014

AIP Conference Proceedings

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The measurement sensitivity distribution of planar capacitive imaging (CI) probes describes how effectively each region in the sensing area is contributing to the measured charge signal on the sensing electrode. It can be used to determine the imaging ability of a CI probe. It is found in previous work that, there are regions in the sensing area where the change of the charge output and the change of targeting physical parameter are of opposite trends. This opposite correlation implies that the measurement sensitivity values in such regions are negative. In this work, the cause of negative sensitivity is discussed. Experiments are also designed and performed so as to verify the existence of negative sensitivity and study the factors that may affect the negative sensitivity distributions.

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Electrical capacitance tomography with square sensor

Abstract: Abstract

Cited by 63 publications

References 3 publications

2D ECT with square sensor using Calderon's method

2D ECT with square sensor using Calderon's method

Design and Experimental Study on the Pulverized Coal Concentration Sensor Based on Gamma-Ray Absorption Method

Negative measurement sensitivity values of planar capacitive imaging probes

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