Cui Ziqiang, Yang Pengyu, Li Xuan, Wang Huaxiang
School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China.
Department of Mathematics, Tianjin University of Finance and Economics Pearl River College, Tianjin 301811, China.
Rev Sci Instrum. 2022 Apr 1;93(4):044710. doi: 10.1063/5.0083681.
Electrical impedance tomography (EIT) can be utilized to image the conductivity distribution of material under test. The EIT measurements depend on the quality in the current injection and voltage measuring circuits. The current source plays a vital role in the EIT instruments. In most of the research studies, the push-pull current sources were employed for the source and sink signal generation. It usually requires frequent calibration to achieve proper functioning, especially for the sweeping frequency measurements. In this paper, an alternative excitation method has been proposed for simplifying the design of the current source in EIT instruments, which aims to achieve the performance of the push-pull current source by using a single-ended current source. It could offer the following advantages: (1) hardware simplification and (2) reduced requirements on current source calibration. The corrected measurements could be consistent with that using push-pull excitation, as confirmed by the numerical simulations. In addition, the reconstructed images have also been investigated to illustrate the effectiveness of the proposed method.
电阻抗断层成像（EIT）可用于对被测材料的电导率分布进行成像。EIT测量取决于电流注入和电压测量电路的质量。电流源在EIT仪器中起着至关重要的作用。在大多数研究中，采用推挽式电流源来产生源信号和汇信号。它通常需要频繁校准才能正常工作，尤其是对于扫频测量。本文提出了一种替代激励方法，旨在简化EIT仪器中电流源的设计，该方法旨在通过使用单端电流源来实现推挽式电流源的性能。它具有以下优点：（1）硬件简化；（2）对电流源校准的要求降低。数值模拟证实，校正后的测量结果与使用推挽式激励的结果一致。此外，还对重建图像进行了研究，以说明所提方法的有效性。
