Time Reversal Imaging of Deeply Buried Targets Under Moderately Rough Surfaces Using Approximate Transmitted Fields

Moghadasi, S. Mahdi; Dehmollaian, Mojtaba; Rashed-Mohassel, J.

doi:10.1109/tgrs.2014.2387280

Cited by 17 publications

(7 citation statements)

References 20 publications

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“…1. Different to most of the known qualitative applications, where the antenna array is located on one side of the medium only (limited-angle) [6], [7], here, in order to determine the dielectric value, the antenna array is located at both sides of the foam (full-angle). The computational domain consist of the polymer foam of size 4,4] cm.…”

Section: Mwt Setupmentioning

confidence: 99%

A Combined Microwave Imaging Algorithm for Localization and Moisture Level Estimation in Multilayered Media

Omrani

Yadav

Link

et al. 2021

2021 15th European Conference on Antennas and Propagation (EuCAP)

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In this work, a multistatic uniform diffraction tomography (MUDT) method, that was proposed by the authors as a new qualitative imaging method just recently, is combined with the quantitative Bayesian inversion framework. In this combined approach, MUDT is applied to find the location of the moisture and this localization is employed as a pre-knowledge for the Bayesian framework to estimate the moisture levels in a polymer foam. The proposed combined algorithm might become a major part of the development of a new kind of intelligent industrial microwave drying systems. The imaging algorithm is tested with simulated measurement data. The frequency band from 8 GHz to 12 GHz (X-band) is used for the MUDT algorithm whereas a single frequency of 8.2 GHz is assumed for the Bayesian framework. The first results demonstrate the ability of the developed combined algorithm for optimizing the computational load unlike seen in the quantitative inversion approaches.

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Section: Mwt Setupmentioning

confidence: 99%

A Combined Microwave Imaging Algorithm for Localization and Moisture Level Estimation in Multilayered Media

Omrani

Yadav

Link

et al. 2021

2021 15th European Conference on Antennas and Propagation (EuCAP)

View full text Add to dashboard Cite

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“…In deriving ( 2) from ( 1) the symmetry property [42] of the DGF is used and, furthermore, it is assumed that both transmitting and receiving antennas are x-polarized and equivalent currents are predominantly x-polarized, so the xx term of the DGF is employed [34]. The MDM can be expressed in the compact form in the angular frequency domain ω as…”

Section: Scattering Model and Time-reversal Imagingmentioning

confidence: 99%

“…Here, we obtain an asymptotic expression for the xx term of the DGF of the multilayered media. Previously, an asymptotic expression for the half-space was derived in [34] and used in TRI. However, this expression cannot be employed in the multilayered media with the high-contrast layer since the reflected wave will no longer be negligible, for example, with a PEC plate at the end of the layer.…”

Section: Dyadic Green Function Of Multilayered Mediamentioning

confidence: 99%

“…By decreasing the number of frequencies, the measurement time can be decreased. Single frequency TR multiple signal classification (SF-TRI-MUSIC) is proposed in [34,48] to increase the resolution of the reconstructed image after reconstructing using ultra-wideband (UWB) TRI-MUSIC. Here, we propose an SF-TRI-DORT by observing the behavior of the eigenvalues.…”

Section: Single Frequency Trimentioning

confidence: 99%

“…To apply the TRI, an exact or approximate dyadic Green's function (DGF) of the medium is required [33]. In [34][35][36][37][38][39], only the transmission part of Green's function was considered to locate the target in the multilayered media. However, it is not sufficient to take into account the presence of metal plates or reflecting surfaces below the foam.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Electromagnetic Time-Reversal Imaging Algorithm for Moisture Detection in Polymer Foam in an Industrial Microwave Drying System

Omrani

Yadav

Link

et al. 2021

Sensors

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Microwave tomography (MWT) based control is a novel idea in industrial heating systems for drying polymer foam. In this work, an X-band MWT module is designed and developed using a fixed antenna array configuration and integrated with the HEPHAISTOS industrial heating system. A decomposition of the time-reversal operator (DORT) algorithm with a proper Green’s function of multilayered media is utilized to localize the moisture location. The derived Green’s function can be applied to the media with low or high contrast layers. It is shown that the time-reversal imaging (TRI) with the proposed Green’s function can be applied to the multilayered media with a moderately rough surface. Moreover, a single frequency TRI is proposed to decrease the measurement time. Numerical results for different moisture scenarios are presented to demonstrate the efficacy of the proposed method. The developed method is then tested on the experimental data for different moisture scenarios from our developed MWT experimental prototype. Image reconstruction results show promising capabilities of the TRI algorithm in estimating the moisture location in the polymer foam.

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Breast tumor detection with TR‐DORT based on multilayered Green's function theory

Yousefnia,

Ebrahimzadeh

2024

Micro & Optical Tech Letters

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Ultrawideband (UWB) time‐reversal techniques are widely used in microwave imaging systems to detect and localize breast tumors. Measuring the scattering electromagnetic fields from a breast phantom can be time‐reversed and back‐propagated to refocus on a tumor. In this study, a Debye model was applied to the breast phantom. Using the decomposition of the time‐reversal operator (TR‐DORT), images were obtained in the UWB frequency range of 3.1–10.6 GHz. The conventional TR imaging method employs the free‐space Green's function to refocus on the tumor, which degrades refocusing in a lossy and dispersive breast phantom. We propose the use of the cylindrical dyadic Green's function in a three‐layer medium for TR imaging. The excitation system consists of a circular array of spiral antennas. The imaging results of the proposed Green's function in TR‐DORT were subsequently calculated, indicating successful tumor detection in different application scenarios of the lossy and dispersive breast phantom.

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Time Reversal Imaging of Deeply Buried Targets Under Moderately Rough Surfaces Using Approximate Transmitted Fields

Cited by 17 publications

References 20 publications

A Combined Microwave Imaging Algorithm for Localization and Moisture Level Estimation in Multilayered Media

A Combined Microwave Imaging Algorithm for Localization and Moisture Level Estimation in Multilayered Media

An Electromagnetic Time-Reversal Imaging Algorithm for Moisture Detection in Polymer Foam in an Industrial Microwave Drying System

Breast tumor detection with TR‐DORT based on multilayered Green's function theory

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