A full time domain methodology based on near field time reversal for equivalent source identification

Abstract

This paper deals with magnetic source characterization in time domain. The basic idea is to solve the inverse problem using the measured near field radiation cartography. In order to ensure the identification procedure, the Time Reversal (TR) technique is used. This procedure allows both the spatial and temporal focusing determination by forcing waves to virtually converge to their initial source. The originality of the proposed methodology is to present a full time domain study of a magnetic source reconstruction. Indeed, this approach is particularly suitable for structures that emit non-sinusoidal radiations such as power electronic systems. First, the Electromagnetic Time Reversal (EMTR) basis are introduced. Then a simulation case study is discussed. Finally, results from an experiment test are presented to verify the proposed methodology. The measured results are in good agreement with the calculated electromagnetic fields. The experimental validation shows that compared to other identification techniques, especially those developed in the frequency domain, the proposed approach is more efficient and simple.

Electromagnetic Time Reversal in the Near Field: Characterization of Transient Disturbances in Power Electronics

“…Time reversal theory has been applied for a long time in acoustics and ultrasounds applications [17][18][19]. Recently, this technique has had a tremendous success in the wide field of electrical engineering [15][16], [20][21][22][23][24]. The originality of TR is to offer the possibility of focusing a wave in both space and time.…”

“…TR has been proven to be capable of providing a solution to spatial and temporal reconstruction problems and locating sources [15][16][17][18][19][20][21][22][23][24]. The present work aims to investigate the use of the TR technique for an EMC application, thereby retrieving emissive sources using radiated magnetic field over a period .…”

“…Indeed, the naming of EMTR is dedicated to the application of the time reversal (TR) technique in the field of electromagnetics. TR has been used for many years in the literature mainly for source location identification [17][18][19][20][21][22][23][24]. Multiple studies and works have been achieved based upon the acoustic wave equation [17][18][19].…”

“…Multiple studies and works have been achieved based upon the acoustic wave equation [17][18][19]. Recently, successful studies were led in electromagnetism, particularly in the EMC context and power systems [15][16], [20][21][22][23][24]. TR has shown several advantages, its straightforward applicability and robustness for inverse scattering or fault detection in complex medium [15], [18].…”

“…In [23], the TD EMTR has been applied using a sinusoidal excitation signal in a simulated test. The proposed method has been validated, in [24], in the case of a Gaussian current in order to assimilate nonlinear systems behavior. In this paper, the EM inverse method based on TR is performed in TD using the NF technique in order to provide an adequate equivalent model that radiates the same emissions as the studied structure in case of several transient sources.…”