Composite Sensitivity Matrix for Reducing the Influence of Medium Electrification on Electrical Capacitance Tomography

The electrical capacitance tomography (ECT) is an image-based technology which has been widely used for gas–solid two-phase flow measurement. The solid-phase electrification is an inevitable phenomenon during pneumatic conveying. To reduce the influence of medium electrification on the ECT image reconstruction, a composite sensitivity matrix (CSM) which takes into account the effect of charge electrification is developed in this paper, so that the image reconstruction error can be well suppressed. This paper first analyzes how the medium electrification affects ECT sensitivity field from the perspective of electromagnetic theory. The CSM is then derived accordingly. Simulations and physical experiments are carried out to validate the proposed method. The experimental results show that the relative error and the correlative coefficient of the reconstructed images have been significantly improved comparing with that in traditional approaches. The results support the effectiveness of the proposed method.

[1]  Ming Kong,et al.  Influence of particle electrification on AC-based capacitance measurement and its elimination , 2015 .

[2]  Toshikazu Ohkubo,et al.  Electrification of a pipe wall during powder transport , 1995 .

[3]  Jiamin Ye,et al.  A sparsity reconstruction algorithm for electrical capacitance tomography based on modified Landweber iteration , 2014 .

[4]  Wuqiang Yang,et al.  Analysis of the effect of stray capacitance on an ac-based capacitance tomography transducer , 2003, IEEE Trans. Instrum. Meas..

[5]  Wuqiang Yang,et al.  Design of electrical capacitance tomography sensors , 2010 .

[6]  Mahmoud Meribout,et al.  A new hierarchical reconstruction algorithm for electrical capacitance tomography using a relaxation region-based approach , 2012 .

[7]  Wuqiang Yang,et al.  A New Forward-Problem Solver Based on a Capacitor-Mesh Model for Electrical Capacitance Tomography , 2008, IEEE Transactions on Instrumentation and Measurement.

[8]  Feifei Fu,et al.  Effects of particle charging on electrical capacitance tomography system , 2012 .

[9]  Wuqiang Yang,et al.  Investigation of wetting and drying process in a gas-solid fluidized bed by electrical capacitance tomography and pressure measurement , 2016 .

[10]  D. Pagano,et al.  Water Volume Fraction Estimation in Two-Phase Flow Based on Electrical Capacitance Tomometry , 2018, IEEE Sensors Journal.

[11]  Xiaoxin Wang,et al.  An AST-ELM Method for Eliminating the Influence of Charging Phenomenon on ECT , 2017, Sensors.

[12]  Yi Li,et al.  Coupling of Fluid Field and Electrostatic Field for Electrical Capacitance Tomography , 2015, IEEE Transactions on Instrumentation and Measurement.

[13]  Artur J. Jaworski,et al.  University of Huddersfield Repository Bubble size and bubble rise velocity estimation by means of electrical capacitance tomography within gas-solids fluidized beds , 2022 .

[14]  Charging of coal powder particles in dense phase pneumatic conveying system at low pressure , 2009, IEEE Transactions on Dielectrics and Electrical Insulation.

[15]  Chuanlong Xu,et al.  Electrostatic Effect on AC-Based ECT and Its Elimination , 2017, IEEE Sensors Journal.

[16]  Lin Li,et al.  An extreme learning machine combined with Landweber iteration algorithm for the inverse problem of electrical capacitance tomography , 2015 .

[17]  Shuji Matsusaka,et al.  Bipolar charge distribution of a mixture of particles with different electrostatic characteristics in gas–solids pipe flow , 2003 .

[18]  Huaxiang Wang,et al.  Electrical capacitance tomography using an accelerated proximal gradient algorithm. , 2012, The Review of scientific instruments.

[19]  Yanbiao Liao,et al.  Preconditioned Landweber iteration algorithm for electrical capacitance tomography , 2005 .

[20]  Yong Yan,et al.  An integrated multi-channel electrostatic sensing and digital imaging system for the on-line measurement of biomass–coal particles in fuel injection pipelines , 2015 .

[21]  Yong Yan,et al.  Real-Time Imaging and Holdup Measurement of Carbon Dioxide Under CCS Conditions Using Electrical Capacitance Tomography , 2018, IEEE Sensors Journal.

[22]  D. Geselowitz.  An application of electrocardiographic lead theory to impedance plethysmography. , 1971, IEEE transactions on bio-medical engineering.

[23]  Yan Zhang,et al.  Electrostatics of the Granular Flow in a Pneumatic Conveying System , 2004 .

[24]  Wuqiang Yang,et al.  An image-reconstruction algorithm based on Landweber's iteration method for electrical-capacitance tomography , 1999 .

[25]  Volodymyr Mosorov,et al.  Measurement of velocity of gas/solid swirl flow using Electrical Capacitance Tomography and cross correlation technique , 2017 .

[26]  Hongli Hu,et al.  Concentration Measurement of Dilute Pulverized Fuel Flow by Electrical Capacitance Tomography , 2015 .

[27]  Shuji Matsusaka,et al.  Electrostatics of particles , 2003 .