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首页> 外文期刊>Measurement Science & Technology >Electrical resistance tomography using a bi-directional current pulse technique
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Electrical resistance tomography using a bi-directional current pulse technique

机译：使用双向电流脉冲技术的电阻层析成像

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摘要

A novel electrical resistance tomography (ERT) measurement system has been developed, which uses a switched bi-directional constant current source to produce the electric field in the measuring vessel. Potential difference measurements are made on both the positive and negative half cycles and subtracted, cancelling any DC components present at the measuring electrode solution interface. The resulting voltage is a function of conductivity distribution in the medium. This technique is considerably simpler than conventional systems involving the injection of sinusoidal current followed by synchronous or DSP based detection. Further, because the current pulse is DC, the differential measurements do not require demodulating and therefore the technique has the potential for high-speed operation. The current pulse. technique is justified in terms of the electrochemistry occurring at the electrodes and electronic circuitry used. The Newton-Raphson (NR) algorithm was used for reconstruction. Experiments were performed on a model system of (a) non-conducting object(s) in a conducting liquid, and on liquid foams of varying bubble size. Visualizations showed that the system could resolve the position and size of the objects, and identify coarse foam regions.
机译：已经开发了一种新颖的电阻层析成像（ERT）测量系统，该系统使用开关双向恒定电流源在测量容器中产生电场。在正半周和负半周均进行电位差测量，并将其相减，以消除测量电极溶液界面处存在的任何直流分量。所得电压是介质中电导率分布的函数。该技术比传统系统要简单得多，后者涉及先注入正弦电流然后进行同步或基于DSP的检测。此外，由于电流脉冲是DC，所以差分测量不需要解调，因此该技术具有高速运行的潜力。当前脉冲。就在电极和所用电子电路上发生的电化学而言，该技术是合理的。牛顿-拉夫森（NR）算法用于重建。实验是在导电液体中的一个或多个非导电物体的模型系统上以及在气泡大小不同的液体泡沫上进行的。可视化显示该系统可以解析物体的位置和大小，并识别出粗糙的泡沫区域。

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