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为了进一步认识电阻层析成像(ERT)系统中敏感场的分布特性,通过采用有限元数值仿真(FEA)的方法建立三维模型并求解,得到了ERT传感器敏感场的三维空间分布,分析了场域分布的不均匀性。并在此基础上,研究了电极构造、空间排列、激励模式等对所建立的场域带来的影响,结果显示,电极长度增加可以改善激励场域,而且相对激励模式所产生的场域要优于相邻激励模式。这些结论为改进敏感场电极阵列的设计,降低反成像算法带来的误差以及还原图像的解释等提供了便利与依据。
In order to further understand the distribution characteristics of sensitive field in resistive tomography (ERT) system, a three-dimensional model was established by finite element numerical simulation (FEA) and solved. The three-dimensional spatial distribution of the sensitive field of ERT sensor was obtained. Uneven distribution. The effects of the electrode structure, spatial arrangement and excitation mode on the established field are studied. The results show that the increase of the electrode length can improve the excitation field, and the field generated by the relative excitation mode Superior to adjacent excitation mode. These conclusions provide convenience and basis for improving the design of the sensitive field electrode array, reducing the error brought by the anti-imaging algorithm and the interpretation of the restored image.