Investigation of Spatial Resolution of Electrical Capacitance Tomography Based on Coupling Simulation
Investigation of Spatial Resolution of Electrical Capacitance Tomography Based on Coupling Simulation
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基于耦合仿真的电容层析成像空间分辨率研究
DOI：
10.1109/tim.2020.3001461
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发表时间：
2020-06
影响因子：
5.6
通讯作者：
Wang Chao
中科院分区：
文献类型：
--
作者：
Ye Jiamin;Yang Wuqiang;Wang Chao
电容层析成像技术(ECT)是一种用于管道或容器内两相流介电常数分布的高时间分辨率成像技术。由于ECT具有弱场、病态、病态等特点，其空间分辨率相对较低。到目前为止，还没有对复杂两相流ECT的空间分辨率进行全面的分析。为了系统地评价电涡流技术的优点，本文对液-固两相流进行了基于流-场和静电场耦合的二维数值模拟。可以同时获得真实的介电常数分布和相应的电容测量结果。研究了电极数目、重建网格以及Landweber迭代算法的初始化方法对图像质量的影响。根据重建的介电常数分布与由耦合仿真模型得到的真实介电常数分布之间的相关系数，定量地评价了重建图像的准确性和稳定性。此外，利用没有电容测量的灵敏度矩阵和点扩展函数对ECT传感器的性能进行了比较，并与耦合仿真中的电容测量结果进行了验证。这两种方法，在有和没有电容测量的情况下，被用来评估不同电极数下ECT的空间分辨率的变化。
Electrical capacitance tomography (ECT) has been developed for imaging permittivity distribution of two-phase flows in a pipe or vessel with high temporal resolution. The spatial resolution of ECT is relatively low due to its soft-field, ill-posed, and ill-conditioned nature. So far, there is no comprehensive analysis of the spatial resolution of ECT for complex two-phase flows. To assess the merits of ECT systematically, 2-D modeling is carried out based on fluid-field and electrostatic-field coupling simulation for liquid–solids two-phase flows. The real permittivity distribution and the corresponding capacitance measurements can be obtained simultaneously. The effect of the number of electrodes, the mesh used for reconstruction, and the initialization method for the Landweber iteration algorithm on image quality are investigated. In terms of the correlation coefficient between the reconstructed permittivity distribution and the real permittivity distribution obtained from the coupling simulation model, the accuracy and the stability of reconstructed images are quantitatively evaluated. Furthermore, the sensitivity matrices and point spread functions calculated without capacitance measurements are used to compare the performance of ECT sensors and validate the results with capacitance measurements from the coupling simulation. The two methods, with and without capacitance measurements, are used to evaluate the change in spatial resolution of ECT with a different number of electrodes.
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