Chitturi Venkatratnam, Farrukh Nagi
Asia Pacific University of Technology and Innovation, TPM, Bukit Jalil, Malaysia.
Department of Mechanical Engineering, UniTEN, Selangor, Malaysia.
J Electr Bioimpedance. 2019 Dec 31;10(1):96-102. doi: 10.2478/joeb-2019-0014. eCollection 2019 Jan.
Electrical impedance tomography (EIT) has a large potential as a two dimensional imaging technique and is gaining attention among researchers across various fields of engineering. Beamforming techniques stem from the array signal processing field and is used for spatial filtering of array data to evaluate the location of objects. In this work the circular electrodes are treated as an array of sensors and beamforming technique is used to localize the object(s) in an electrical field. The conductivity distributions within a test tank is obtained by an EIT system in terms of electrode voltages. These voltages are then interpolated using elliptic partial differential equations. Finally, a narrowband beamformer detects the peak in the output response signal to localize the test object(s). Test results show that the beamforming technique can be used as a secondary method that may provide complementary information about accurate position of the test object(s) using an eight electrode EIT system. This method could possibly open new avenues for spatial EIT data filtering techniques with an understanding that the inverse problem is more likely considered here as a source localization algorithm instead as an image reconstruction algorithm.
电阻抗断层成像（EIT）作为一种二维成像技术具有巨大潜力，正在引起各个工程领域研究人员的关注。波束形成技术源于阵列信号处理领域，用于对阵列数据进行空间滤波以评估物体的位置。在这项工作中，圆形电极被视为传感器阵列，并且使用波束形成技术在电场中定位物体。测试槽内的电导率分布由EIT系统根据电极电压获得。然后使用椭圆型偏微分方程对这些电压进行插值。最后，窄带波束形成器检测输出响应信号中的峰值以定位测试物体。测试结果表明，波束形成技术可以用作辅助方法，使用八电极EIT系统可能提供有关测试物体准确位置的补充信息。考虑到这里更可能将反问题视为源定位算法而非图像重建算法，这种方法可能为空间EIT数据滤波技术开辟新途径。
