Hamidreza Karami

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Assessment of the Feasibility of Applying the Electromagnetic Time Reversal Theory to Locate Defects in Grounding Electrodes

Hamidreza Karami, Marcos Rubinstein

In recent years, the electromagnetic time reversal (EMTR) theory has been successfully applied for locating various sources of disturbances, such as short-circuit faults, in power systems. In this paper, a theoretical analysis of the feasibility of applying EMTR to locate defects (corrosion and break points) in grounding systems is presented. An EMTR algorithm to locate faults in buried grounding wires is proposed and a comprehensive analysis with respect to some salient influencing parameters, for instance, the ground conductivity, medium losses, the defect location and type (soft or hard), is carried out. According to the obtained results, the proposed method appears to be very promising for real applications. The need for experimental validation to confirm the applicability of this method is emphasized.

2023

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, ,

In this article, we propose a novel approach for the localization of electromagnetic interference (EMI) sources based on the concept of compressive sensing and metalenses. We show that using the spatial and frequency dispersion offered by the metalens, we can create a scanning beam to provide an image of the current distribution in a printed circuit board. We deployed a computational imaging framework to extract the information in the observation plane of the imaging system and thus obtain the location of the EMI source. To use mode diversity offered by the metalens, we suggest using the compressive sensing platform. To the authors’ best knowledge, this is the first utilization of metalenses, computational imaging, and compressive sensing to locate EMI sources. Numerical simulation is used to implement and investigate the ability of the proposed approach to localized EMI sources. The obtained results show a very accurate localization skill. The proposed approach overcomes the diffraction limit and provides λ /17 superresolution. Moreover, the proposed approach uses a single stationary antenna to collect data and does not need either mechanical scanning, which is time consuming, or a beamforming array, which is expensive.

2022

Chargement

A Time-Reversal Cavity for Electromagnetic Waves in Transmission Line Networks with Arbitrary Topology

Hamidreza Karami, Marcos Rubinstein, Zhaoyang Wang

2022

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