电容和电阻层析传感器的三维效应

Jiangtao Sun, Wuqiang Yang
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引用次数: 8

摘要

在电阻层析成像(ERT)传感器中,通常使用小针脚电极。众所周知,引脚电极会引起严重的场畸变或三维效应,这种ERT传感器的传感区域不局限于引脚电极平面,而是向大体积扩散。电容层析成像(ECT)传感器也是如此,尽管由于ECT传感器的电极尺寸较大,它不那么严重。然而,当将ECT传感器的电极长度缩小到与ERT传感器几乎相同的尺寸时,3D效果可能同样明显。为了研究ERT和ECT传感器的三维效果,采用不同长度的电极进行了仿真,并与相应的二维仿真结果进行了比较。结果表明,在没有保护电极的情况下,电极较长的传感器三维效果较差。为了研究接地保护装置的有效性,对带接地保护装置的ECT传感器进行了三维仿真,并与前人的三维效果进行了比较。研究发现,ECT与不带保护装置的ERT传感器的三维效果相似,接地保护装置可以在很大程度上降低ECT传感器的三维效果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
3D effect of electrical capacitance and resistance tomography sensors
In electrical resistance tomography (ERT) sensors, small pin electrodes are commonly used. It is well known that the pin electrodes cause severe field distortions or 3D effect, and the sensing region of such an ERT sensor is not constrained to the pin electrode plane, but spreads to a large volume. This is also true for electrical capacitance tomography (ECT) sensors, even though it is less severe because of larger size electrodes in ECT sensors. However, when the length of electrodes in an ECT sensor is reduced to almost the same dimension as those in ERT sensor, the 3D effect may be equally obvious. To investigate the 3D effect of ERT and ECT sensors, simulation was carried out with different lengths of electrodes and the results are compared with the corresponding 2D simulation. It is concluded that sensors with longer electrodes usually have less 3D effect without guard electrodes. To investigate the effectiveness of grounded guards, 3D simulation was carried out for ECT sensors with grounded guards and the results are compared with the previous results in term of the 3D effect. It is found that the 3D effects of ECT and ERT sensors without guards are similar to each other, and the grounded guards can reduce the 3D effect of ECT sensors to a great extent.
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