Electrical impedance tomography (EIT) is a fast and portable radiation-free tomographic imaging modality which has been found promising in a number of applications in engineering and applied science fields. In EIT, a constant-amplitude sinusoidal current signal is applied to an object under test, and the potentials at object-boundary are measured through an array of surface electrodes surrounding the object. The voltage and current data are collected for different current injection projections to collect the data sets for a complete electrical scanning. A computer program called image reconstruction algorithm (IRA) is applied to get the conductivity distribution within the domain under test as the tomographic image by solving the forward and inverse problems. A PC-based dedicated instrumentation is required for current injection and voltage measurement from the object. In recent times, wireless instrumentation is being studied to obtain the wireless EIT (WL-EIT) systems as the wireless devices have many advantages. In wireless EIT, the current injection and data collection through wireless instrumentation suffer from some technical limitations, and hence, the scientific research investigations are required to overcome the hurdles and to explore the technology. The structural health monitoring (SHM) is required to assess the quality, durability and performance of the structure. Continuous or regular SHM is beneficial for the material assessment for longer period of time. Wireless EIT may provide an excellent opportunity for impedance imaging based SHM of any mechanical structure from remote area. In this paper, the benefits of the wireless EIT have been discussed with its possible applications for SHM of mechanical structures. The technology and instrumentation are studied, followed by a few case studies on wireless EIT. The advantages and limitations are discussed along with a highlight on future trends.
Wireless Electrical Impedance Tomography (EIT) Instrumentation: Progress and Limitations
Lect.Notes Mechanical Engineering
2022-03-02
12 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Electrical impedance tomography (EIT) , Structural health monitoring (SHM) , Wireless EIT (WL-EIT) , WL-EIT instrumentation , Constant current source , Data acquisition , Image remonstration , Conductivity distribution Engineering , Automotive Engineering , Aerospace Technology and Astronautics , Industrial Chemistry/Chemical Engineering
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