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中文摘要：
提出一种用于两相流测量的高速电阻层析成像（electrical resistance tomography，ERT）系统。该系统采用双极性脉冲电流源为激励电极对提供激励信号，避免了直流激励造成的电极极化效应，同时简化了滤波电路的设计，相对于常规的交流激励ERT系统显著提高了数据采集速度。针对成像速度较快但成像质量差的线性反投影算法（linear back projection，LBP），采用离线预迭代技术对其进行改进，提出一种改进型线性反投影算法（modified LBP，MLBP），可高速重建较好质量的ERT图像。数值仿真和采用实际测量数据重建图像的结果表明，基于高速数据采集技术和改进的图像重建算法的高速ERT系统可实现两相流实时在线测量。
英文摘要：
A high speed electrical resistance tomography （ERT） system was developed, in which the electrodes were excited with a bi-directional pulse current source. The main advantages of this new design included absence of polarization effect at electrodes and high speed data acquisition due to the simplified filters design. Based on the linear back projection （LBP） image reconstruction algorithm, a modified LBP （MLBP） method was developed for this ERT system. By adopting an offline iteration technique and incorporating it with the LBP, the MLBP could reconstruct images of better quality than the LBP with similar image reconstruction speed. Experimental results showed that the new ERT system had the advantages of high image reconstruction speed and good image quality. It could implement realtime measurement of two phase flow.
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