An iterative back projection method (i-BP) has been developed to improve the resolution of reconstructed images produced by electrical resistance tomography (ERT). This solution is based on an iterative calculation of the electrical fields and it is possible to reconstruct clearer images than those reconstructed by the conventional back projection method without divergence. However, it does take several minutes to finish the iteration process, and therefore this solution can be applied to flow fields that require high spatial resolution rather than short processing times, such as the accumulation of noble metals in glass melters. Numerical simulations and experiments using a simple model are performed in this study. The numerical simulations show that clear images are reconstructed both near the wall and at the center by i-BP. The conductivity correlation coefficient between the genuine distribution and the reconstructed image is improved from 0.4 to 0.9. The validity of the i-BP method is also confirmed by the experimental results. As a result, it is confirmed that ERT and i-BP are capable of reconstructing acceptable images and have potential for use in the visualization of the accumulation of noble metals in a glass melter.Graphical Abstract

中文翻译：

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迭代反投影法增强电阻层析成像的分辨率

已经开发了一种迭代反投影方法 (i-BP) 来提高由电阻断层扫描 (ERT) 产生的重建图像的分辨率。该解决方案基于电场的迭代计算，并且可以重建比通过传统反投影方法重建的图像更清晰的图像而不会发散。然而，完成迭代过程需要几分钟的时间，因此该解决方案可以应用于需要高空间分辨率而不是短处理时间的流场，例如贵金属在玻璃熔炉中的积累。在本研究中进行了使用简单模型的数值模拟和实验。数值模拟表明，i-BP 重建了靠近墙壁和中心的清晰图像。真实分布与重建图像的电导率相关系数从0.4提高到0.9。实验结果也证实了 i-BP 方法的有效性。因此，证实 ERT 和 i-BP 能够重建可接受的图像，并具有用于可视化玻璃熔炉中贵金属积累的潜力。图形摘要