Journal
IEEE SENSORS JOURNAL
Volume 17, Issue 24, Pages 8091-8098Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2017.2684245
Keywords
Electrical capacitance tomography; large scale sensor; excitation strategy; internal-external electrodes
Funding
- National Natural Science Foundation of China [61374018]
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The fringe effect of a large-scale electrical capacitance tomography (ECT) sensor is more serious than a small-scale ECT sensor. As a result, the sensitivity in the central region of a large-scale ECT sensor becomes so low that it is difficult to achieve desired image quality in the central region. To improve the image quality with a large-scale ECT sensor, a combination of internal and external electrodes (IEE) is used, and five two-electrode excitation strategies are presented in comparison with the traditional one-electrode excitation strategy. The images reconstructed by a linear backprojection (LBP) algorithm with the six excitation strategies are analyzed and a modified method is proposed to reduce the effect of noise. The performance of the IEE sensors with the modified LBP and the six excitation strategies is evaluated in terms of the relative error of solids concentration.
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