This article presents a method for real-time 3-D imaging and velocity measurement of two-phase flows using a twin-plane electrical capacitance tomography (ECT) sensor with 24 electrodes. A dedicated digital ECT system with a data acquisition rate of 241 frames/s is used for capacitance measurement. In this article, the sensitivity distribution of the ECT sensor is analyzed, and the two most commonly used algorithms, linear back projection (LBP) and Tikhonov, are used to achieve high-speed 3-D image reconstruction. The cross correlation technique is used to calculate the velocity of a two-phase flow. Experiments were carried out to evaluate the performance of the proposed method. Several typical distributions were constructed and used to analyze the axial imaging resolution. A free-falling sphere was used to test the ability of the system in velocity measurement. Experimental results show that the proposed method can provide high axial resolution in the central zone of the 3-D sensor and high temporal resolution in velocity measurement.

中文翻译：

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使用双平面 ECT 传感器对两相流进行实时 3D 成像和速度测量


本文介绍了一种使用具有 24 个电极的双平面电容断层扫描 (ECT) 传感器对两相流进行实时 3D 成像和速度测量的方法。电容测量采用数据采集速率为241帧/秒的专用数字ECT系统。本文分析了 ECT 传感器的灵敏度分布，并使用线性反投影（LBP）和 Tikhonov 两种最常用的算法来实现高速 3D 图像重建。互相关技术用于计算两相流的速度。进行了实验来评估所提出方法的性能。构建了几种典型的分布并用于分析轴向成像分辨率。使用自由落体球体来测试系统的速度测量能力。实验结果表明，所提出的方法可以在3D传感器的中心区域提供高轴向分辨率，并在速度测量中提供高时间分辨率。