Sensitivity Map Analysis of Adaptive Electrical Capacitance Volume Tomography Using Nonuniform Voltage Excitation Envelopes

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Abstract
Electrical capacitance tomography (ECT) is a low-cost high-speed imaging technique, which can be applied in many fields. ECT is predicted by the data of the sensitivity map to reconstruct an image of the interested field. Thus, the resolution of the predicted image is highly dependent on the computation of the sensitivity map. In this paper, we compared the differences of sensitivity maps between electrical capacitance volume tomography (ECVT) system and adaptive electrical capacitance tomography (AECVT) system. The experiment sensors used for comparison were of the same size yet different plates, namely, conventional and synthetic. The synthetic plates were excited by different voltage envelopes, while the conventional ones could only be excited by single voltage at the same time. Then, the voltage distributions and the sensitivity maps of both systems were analyzed in both horizontal and vertical directions, respectively. The results had shown that AECVT system was similar to ECVT system with single voltage excitation yet it offered multiple distributions in cross sections, which could improve the lateral resolution while reducing the sensitivity in the vertical direction with multiple voltages excitation.
Funding Information
  • National Nature Science Foundation of China (61362025)

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