scholarly journals FDTD simulation of electromagnetic wave propagation in magnetic randomly inhomogeneous media

2021 ◽  
Author(s):  
Pavel Makarov ◽  
Vladimir Ustyugov ◽  
Leonid Kotov ◽  
Sergey V. Nekipelov ◽  
Viktor Sivkov
Keyword(s):  
Electromagnetic Waves ◽  
Phase Contrast ◽  
Electromagnetic Wave Propagation ◽  
Fdtd Method ◽  
Inhomogeneous Media ◽  
Close Packing ◽  
Fdtd Simulation ◽  
Magnetic Media ◽  
Sine Signal ◽  
Diffuse Distribution

An algorithm for the numerical simulation of the propagation of electromagnetic waves in randomly inhomogeneous magnetic media by the FDTD method has been developed. The formulated algorithm is suitable for analyzing the main timing characteristics, as well as identifying the features of the propagation of various types of signals in both time-independent and time-dependent layered randomly inhomogeneous media. The simulation of the propagation of the sine pulse, sine signal and square wave in time-independent magnetic randomly inhomogeneous media with a various levels of phase contrast of two types - with a “diffuse” distribution of inhomogeneities and their “close packing” is carried out. The influence of the concentration of magnetic granules and the type of their distribution on the characteristics of the transmitted and reflected signals is revealed.

scholarly journals FDTD simulation of electromagnetic wave propagation in magnetic randomly inhomogeneous media

2021 ◽  
Author(s):  
Pavel Makarov ◽  
Vladimir Ustyugov ◽  
Leonid Kotov ◽  
Sergey V. Nekipelov ◽  
Viktor Sivkov
Keyword(s):  
Electromagnetic Waves ◽  
Phase Contrast ◽  
Electromagnetic Wave Propagation ◽  
Fdtd Method ◽  
Inhomogeneous Media ◽  
Close Packing ◽  
Fdtd Simulation ◽  
Magnetic Media ◽  
Sine Signal ◽  
Diffuse Distribution

An algorithm for the numerical simulation of the propagation of electromagnetic waves in randomly inhomogeneous magnetic media by the FDTD method has been developed. The formulated algorithm is suitable for analyzing the main timing characteristics, as well as identifying the features of the propagation of various types of signals in both time-independent and time-dependent layered randomly inhomogeneous media. The simulation of the propagation of the sine pulse, sine signal and square wave in time-independent magnetic randomly inhomogeneous media with a various levels of phase contrast of two types - with a “diffuse” distribution of inhomogeneities and their “close packing” is carried out. The influence of the concentration of magnetic granules and the type of their distribution on the characteristics of the transmitted and reflected signals is revealed.

scholarly journals FDTD simulation of electromagnetic wave propagation in magnetic randomly inhomogeneous media

2021 ◽  
Author(s):  
Pavel Makarov ◽  
Vladimir Ustyugov ◽  
Leonid Kotov ◽  
Sergey V. Nekipelov ◽  
Viktor Sivkov
Keyword(s):  
Electromagnetic Waves ◽  
Phase Contrast ◽  
Electromagnetic Wave Propagation ◽  
Fdtd Method ◽  
Inhomogeneous Media ◽  
Close Packing ◽  
Fdtd Simulation ◽  
Magnetic Media ◽  
Sine Signal ◽  
Diffuse Distribution

An algorithm for the numerical simulation of the propagation of electromagnetic waves in randomly inhomogeneous magnetic media by the FDTD method has been developed. The formulated algorithm is suitable for analyzing the main timing characteristics, as well as identifying the features of the propagation of various types of signals in both time-independent and time-dependent layered randomly inhomogeneous media. The simulation of the propagation of the sine pulse, sine signal and square wave in time-independent magnetic randomly inhomogeneous media with a various levels of phase contrast of two types - with a “diffuse” distribution of inhomogeneities and their “close packing” is carried out. The influence of the concentration of magnetic granules and the type of their distribution on the characteristics of the transmitted and reflected signals is revealed.

FDTD simulation of electromagnetic wave propagation in magnetic randomly inhomogeneous media

2021 ◽  
pp. 1-1
Author(s):  
Pavel Makarov ◽  
Vladimir Ustyugov ◽  
Leonid Kotov ◽  
Sergey Nekipelov ◽  
Viktor Sivkov
Keyword(s):  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Electromagnetic Wave Propagation ◽  
Inhomogeneous Media ◽  
Fdtd Simulation

Detection of delamination in composites by using electromagnetic penetrating radar

2014 ◽  
Vol 5 (2) ◽  
pp. 151-156
Author(s):  
Z. Mechbal ◽  
A. Khamlichi
Keyword(s):  
Electromagnetic Wave ◽  
Electromagnetic Waves ◽  
Electromagnetic Wave Propagation ◽  
Wave Reflection ◽  
Image Features ◽  
Partial Reflection ◽  
Straight Path ◽  
Reflected Signal ◽  
Short Time ◽  
Intervening Factors

Composites made from E-glass/epoxy or aramid/epoxy are frequently used in aircraft and aerospace industries. These materials are prone to suffer from the presence of delamination, which can reduce severely the performance of aircrafts and even threaten their safety. Since electric conductivity of these composites is rather small, they can propagate electromagnetic waves. Detection of delamination damage can then be monitored by using an electromagnetic penetrating radar scanner, which consists of emitting waves having the form of short time pulses that are centered on a given work frequency. While propagating, these waves undergo partial reflection when running into an obstacle or a material discontinuity. Habitually, the radar is moved at constant speed along a straight path and the reflected signal is processed as a radargram that gives the reflected energy as function of the two-way time and the antenna position.In this work, modeling of electromagnetic wave propagation in composites made from E-glass/epoxy was performed analytically. The electromagnetic wave reflection from a delamination defect was analyzed as function of key intervening factors which include the defect extent and depth, as well as the work frequency. Various simulations were performed and the obtained results have enabled to correlate the reflection pattern image features to the actual delamination defect characteristics which can provide quantification of delamination.

scholarly journals Study Effect of Objects Orientation in the Mediums On GPR Signal Reflections Using FDTD Simulation

2018 ◽  
Vol 3 (11) ◽  
pp. 73-77
Author(s):  
Aye Mint Mohamed Mostapha ◽  
Gamil Alsharahi ◽  
Abdellah Driouach
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Ground Penetrating Radar ◽  
High Frequency ◽  
Electromagnetic Waves ◽  
Ground Surface ◽  
Propagation Path ◽  
Fdtd Simulation ◽  
Ground Penetrating ◽  
Dielectric Objects

Ground penetrating radar (GPR) is a very effective tool for detecting and identifying objects below the ground surface.  based on  the propagation and reflection of high-frequency electromagnetic waves. The GPR reflection can be affected by many things like the type of objects orientation, their shapes ..ect. The purpose of this paper is to  study by simulation the effect of objects orientation in two different mediums (dry and wet sand) on the GPR signal reflection using Reflexw software which is based on a numerical method known as finite difference in time domain (FDTD).  The simulations that have been realized included a conductor  and dielectric objects. The results obtained have led us to find that the propagation path, the reflection strength and the signal form change with the change of object orientation and nature. To confirm the validity of the results, we compared them with experimental results previously published by researchers under the same conditions.

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