当前位置: X-MOL 学术Meas. Sci. Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Practical comparisons of EIT excitation protocols with applications in high-contrast imaging
Measurement Science and Technology ( IF 2.4 ) Pub Date : 2021-05-28 , DOI: 10.1088/1361-6501/abe742
Chunhui Dang 1, 2 , Cdric Bellis 3 , Mathieu Darnajou 1, 2 , Guillaume Ricciardi 1 , Saba Mylvaganam 3 , Salah Bourennane 4
Affiliation  

In the field of electrical impedance tomography (EIT), numerous studies have aimed at the optimal excitation/measurement strategies for improving conductivity distribution imaging, particularly in the applications involving highly contrasted materials. These studies focus on the conditions to be imposed on the currents fed into the electrodes and on their measurement counterparts, while making use of various quantitative optimal criteria. While most EIT systems rely on a sequential excitation at neighboring electrodes with measurements at the remaining ones, some alternative excitation strategies, or protocols, have also proven to be effective and easy to implement using modern hardware. In this context, the present study aims at confronting some of the predominant EIT excitation protocols on a practical system that is dedicated to the imaging of media with highly contrasted material components, i.e. with large variations of the conductivity field. More specifically, the so-called adjacent, opposite, full-scan and trigonometric excitation strategies are considered here and assessed on a number of criteria, which are: complexity of a practical implementation, number of independent measurements, amplitude of the measured responses, sensitivity distribution and quality of the final reconstructed images. For each of these excitation protocols, numerical simulations and static experiments with test objects placed in the EIT sensor considered are carried out using various conductivity profiles, while reconstructed images are evaluated both qualitatively and qualitatively. Our results highlight the preeminence of the full-scan and trigonometric strategies, which are characterized by high response signals and satisfying overall sensitivities. Moreover, for the studied configurations in both numerical simulations and static experiments, the full scan and trigonometric strategies lead to improved contrasts in the reconstructed images of the phases distribution.



中文翻译:

EIT 激发协议与高对比度成像应用的实际比较

在电阻抗断层扫描 (EIT) 领域,许多研究旨在寻找最佳的用于改善电导率分布成像的激发/测量策略,特别是在涉及高对比度材料的应用中。这些研究侧重于施加到电极中的电流及其测量对应物的条件,同时利用各种定量优化标准。虽然大多数 EIT 系统依赖于相邻电极的顺序激励,并在其余电极上进行测量,但一些替代激励策略或协议也已被证明是有效且易于使用现代硬件实现的。在这种情况下,本研究旨在解决一些主要的 EIT 激发协议,该系统专门用于对具有高对比度材料成分的介质进行成像,即 电导场变化很大。更具体地说,这里考虑了所谓的相邻、相反、全扫描和三角激励策略,并根据许多标准进行评估,这些标准是:实际实施的复杂性、独立测量的数量、测量响应的幅度、灵敏度最终重建图像的分布和质量。对于这些激励协议中的每一个,使用各种电导率曲线对放置在所考虑的 EIT 传感器中的测试对象进行数值模拟和静态实验,同时对重建图像进行定性和定性评估。我们的结果突出了全扫描和三角策略的卓越性,其特点是高响应信号和令人满意的整体灵敏度。

更新日期:2021-05-28
down
wechat
bug