volume | PIER Journals

Abstract

Spatial resolution represents akey performance aspect in electrical capacitance volume tomography (ECVT). 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. 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.

1. Wang, H. and W. Yang, "Scale-up of an electrical capacitance tomography sensor for imaging pharmaceutical fluidized beds and validation by computational fluid dynamics," Meas. Sci. Technol., Vol. 22, No. 10, 104015, 2011.
doi:10.1088/0957-0233/22/10/104015 Google Scholar

2. Yang, D. Y., B. Zhou, C. L. Xu, and S. M. Wang, "Thick-wall electrical capacitance tomography and its application in dense-phase pneumatic conveying under high pressure," IET Image Proc., Vol. 5, No. 5, 513-522, 2011.
doi:10.1049/iet-ipr.2009.0209 Google Scholar

3. Rimpiläinen, V., S. Poutiainen, L. M. Heikkinen, T. Savolainen, M. Vauhkonen, and J. Ketolainen, "Electrical capacitance tomography as a monitoring tool for high-shear mixing and granulation," Chem. Eng. Sci., Vol. 66, No. 18, 4090-4100, 2011.
doi:10.1016/j.ces.2011.05.044 Google Scholar

4. Chandrasekera, T. C., A. Wang, D. J. Holland, Q. Marashdeh, M. Pore, F. Wang, A. J. Sederman, L. S. Fan, L. F. Gladden, and J. S. Dennis, "A comparison of magnetic resonance imaging and electrical capacitance tomography: An air jet through a bed of particles," Powder Technol., Vol. 227, 86-95, 2012.
doi:10.1016/j.powtec.2012.03.005 Google Scholar

5. Warsito, W., Q. Marashdeh, and L. S. Fan, "Electrical capacitance volume tomography," IEEE Sensors J., Vol. 7, No. 4, 525-535, 2007.
doi:10.1109/JSEN.2007.891952 Google Scholar

6. Wang, F., Q. Marashdeh, L. S. Fan, and W. Warsito, "Electrical capacitance volume tomography: Design and applications," Sensors, Vol. 10, 1890-1917, 2010.
doi:10.3390/s100301890 Google Scholar

7. Wang, F., Q. Marashdeh, A. Wang, and L. S. Fan, "Electrical capacitance volume tomography imaging of three-dimensional flow structures and solids concentration distributions in a riser and a bend of a gas-solid circulating fluidized bed," Ind. & Eng. Chem. Res., Vol. 51, 10968-10976, 2012.
doi:10.1021/ie300746q Google Scholar

8. Pore, M., T. C. Chandrasekera, D. J. Holland, A. Wang, F. Wang, Q. Marashdeh, M. D. Mantle, A. J. Sederman, L.-S. Fan, L. F. Gladdena, and J. S. Dennis, "Magnetic resonance studies of jets in a gas-solid fluidised bed," Particuology, Vol. 10, 161-169, 2012.
doi:10.1016/j.partic.2011.10.005 Google Scholar

9. Marashdeh, Q., W. Warsito, L.-S. Fan, and F. L. Teixeira, "Non-linear image reconstruction technique for ECT using a combined neural network approach," Meas. Sci. Technol., Vol. 17, No. 8, 2097-2103, 2006.
doi:10.1088/0957-0233/17/8/007 Google Scholar

10. Soleimani, M., P. K. Yalavarthy, and H. Dehghani, "Helmholtz-type regularization method for permittivity reconstruction using experimental phantom data of electrical capacitance tomography," IEEE Tran. Instr. Meas., Vol. 59, No. 1, 78-83, 2010.
doi:10.1109/TIM.2009.2021645 Google Scholar

11. Lei, J., S. Liu, H. H. Guo, Z. H. Li, J. T. Li, and Z. X. Han, "An image reconstruction algorithm based on the semiparametric model for electrical capacitance tomography," Comp. Math. Appl., Vol. 61, No. 9, 2843-2853, 2011.
doi:10.1016/j.camwa.2011.03.060 Google Scholar

12. Cao, Z., L. Xu, and H.Wang, "Image reconstruction technique of electrical capacitance tomography for low-contrast dielectrics using Calderon’s method," Meas. Sci. Technol., Vol. 20, No. 10, 2009.
doi:10.1088/0957-0233/20/10/104027 Google Scholar

13. Yang, W., "Design of electrical capacitance tomography sensors," Meas. Sci. Technol., Vol. 21, No. 4, 042001, 2010.
doi:10.1088/0957-0233/21/4/042001 Google Scholar

14. Peng, L., J. Ye, G. Lu, and W. Yang, "Evaluation of effect of number of electrodes in ECT sensors on image quality," IEEE Sensors J., Vol. 12, No. 5, 1554-1565, 2012. Google Scholar

15. Warsito, W. and L. S. Fan, "Neural network multi-criteria optimization image reconstruction technique (NN-MOIRT) for linear and non-linear process tomography," Chem. Eng. Proc., Vol. 42, 663-674, 2003.
doi:10.1016/S0255-2701(02)00204-0 Google Scholar

16. Marashdeh, Q. and F. L. Teixeira, "Sensitivity matrix calculation for fast electrical capacitance tomography (ECT) of flow systems," IEEE Trans. Magn., Vol. 40, No. 2, 1204-1207, 2004.
doi:10.1109/TMAG.2004.825039 Google Scholar

17. Marashdeh, Q., W. Warsito, L.-S. Fan, and F. L. Teixeira, "Nonlinear forward problem solution for electrical capacitance tomography using feed forward neural network," IEEE Sensors J., Vol. 6, No. 2, 441-449, 2006.
doi:10.1109/JSEN.2005.860316 Google Scholar

18. Yates, J. G., D. J. Cheesman, and Y. A. Sergeev, "Experimental observations of voidage distribution around bubbles in a fluidized bed," Chem. Eng. Sci., Vol. 49, 1885-1895, 1994.
doi:10.1016/0009-2509(94)80073-1 Google Scholar

19. Bhaga, D. and M. E. Weber, "Bubbles in viscous liquids: Shapes, wakes and velocities," J. Fluid Mech., Vol. 105, 61-85, 1981.
doi:10.1017/S002211208100311X Google Scholar

20. Marashdeh, Q. M., F. L. Teixeira, and L.-S. Fan, "Adaptive electrical capacitance volume tomography," IEEE Sensors J., Vol. 14, No. 4, 1253-1259, 2014.
doi:10.1109/JSEN.2013.2294533 Google Scholar

21. Zeeshan, F., L. Teixeira, and Q. Marashdeh, "Sensitivity map computation in adaptive electrical capacitance volume tomography with multielectrode excitations," Electron. Lett., Vol. 51, No. 4, 334-336, 2015.
doi:10.1049/el.2014.3855 Google Scholar

22. Marashdeh, Q., W. Warsito, L.-S. Fan, and F. L. Teixeira, "A multimodal tomography system based on ECT sensors," IEEE Sensors J., Vol. 7, No. 3, 426-433, 2007.
doi:10.1109/JSEN.2006.890149 Google Scholar

23. Marashdeh, Q., W. Warsito, L.-S. Fan, and F. L. Teixeira, "Dual imaging modality of granular flow based on ECT sensors," Granular Matter, Vol. 10, No. 2, 75-80, 2008.
doi:10.1007/s10035-007-0070-2 Google Scholar

Dr. Aining Wang

Dr. Qussai M. Marashdeh

Prof. Fernando Lisboa Teixeira

Dr. Liang-Shih Fan