介电常数未知条件下ECT图像重建的仿真研究

Simulation research into ECT Reconstruction Image under Unknown Dielectric Constant

对于依赖于灵敏度矩阵的ECT系统,计算灵敏度矩阵时所设定的高、低相介电常数值影响系统图像重建的质量。工程上应用ECT系统监测某种介质分布时,经常会遇到介电常数未知的情况。本文利用仿真方法研究了介电常数未知时介电常数选择的方法。仿真实验表明,不论采用哪种介电常数组合,都会获得较好的实验重建结果,但是在高、低介电常数相差小时,典型分布重建图像的AE、SIE两项指标要优于其他几种组合。

In most ECT system concerned with sensitivity matrix, the established value of dielectric constant will affect the quality of image reconstruction. The unknown dielectric constant usually appears when ECT system are used to monitor the measured material distribution. Simulation method has been used to study the constant of sensitivity matrix calculated under unknoqn dielectric constant. The simulation results show that no matter what kind of dielectric constant combination are adopted, results of experimental reconstruction are acceptable. And small difference between high and low dielectric constant is conductive to improve the quality of reconstruction image.