Laboratory for Computational Transport Phenomena (LFTC), Department of Postgraduate Studies in Mechanical Engineering, Universidade Federal do Espírito Santo (UFES), Vitória-ES 29075-910, Brazil.
Faculty of Engineering, Universidade Federal de Catalão (UFCAT), Catalão-State of Goiás 75705-220, Brazil.
Rev Sci Instrum. 2022 Jul 1;93(7):074705. doi: 10.1063/5.0088296.
Electrical Resistance Tomography (ERT) has the potentialities of non-intrusive techniques and high temporal resolution which are essential characteristics for multiphase flow measurements. However, high background conductivities, such as saline water in oil extraction, impose a limitation in ERT image reconstruction. Focusing on the operational limits of an ERT tomography system operating in different conductivity backgrounds from 0.010 to 4.584 S/m, the impact on the image reconstruction was assessed via signal-to-noise variance. The signal-to-noise ratio (SNR) variance had a strong correlation (p-value = 5.40 × 10) with the image reconstruction quality at the threshold of 30 dB, reaching a correlation value of r = -0.92 in the range of 0.010-0.246 S/m. Regarding the position error of the phantom, p-value = 1.30 × 10 and r = -0.66 were attained. The global results revealed that the correlation of the mean of the SNR (p-value = 5 × 10 and r = 0.55) was kept unaltered through the whole conductivity range, showing that such a statistical index can induce bias in establishing the operational limits of the hardware.
电阻层析成像（ERT）具有非侵入式技术和高时间分辨率的潜力，这是多相流测量的关键特性。然而，高背景电导率，如采油中的盐水，对 ERT 图像重建施加了限制。本研究聚焦于在 0.010 至 4.584 S/m 不同电导率背景下运行的 ERT 层析成像系统的操作限制，通过信噪比方差评估其对图像重建的影响。信噪比（SNR）方差与 30dB 阈值下的图像重建质量具有很强的相关性（p 值=5.40×10），在 0.010 至 0.246 S/m 范围内达到 r=-0.92 的相关值。至于仿体的位置误差，p 值=1.30×10 和 r=-0.66。总体结果表明，整个电导率范围内 SNR 均值的相关性（p 值=5×10 和 r=0.55）保持不变，表明这种统计指标可能会导致在确定硬件操作限制时产生偏差。
