Piecewise and Wiener Filter-Based SAR Techniques for Monostatic Microwave Imaging of Layered Structures

Fallahpour, Mojtaba; Case, Joseph T.; Ghasr, Mohammad Tayeb; Zoughi, R.

doi:10.1109/tap.2013.2287024

Cited by 119 publications

(75 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Tomographic imaging algorithms provide efficient quantitative reconstruction of cross-sections of inhomogeneous objects, such as their location, shape and electrical properties, etc. [18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…A linear inverse scattering algorithm for the imaging of 2D objects buried in a two-layered media was proposed in [25]. A piecewise and Wiener filterbased SAR techniques are presented for the imaging of targets in layered structures in [23]. Nonlinear iterative imaging algorithm for the reconstruction of concealed targets buried in a multilayered media environment was proposed in [29].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Two-Dimensional Microwave Tomographic Algorithm for Radar Imaging Through Multilayered Media

Zhang¹

2014

PIER

View full text Add to dashboard Cite

Abstract-The imaging of targets embedded in a planar layered background media has been an important topic in subsurface and urban sensing. In this paper a fast and efficient tomographic algorithm for the imaging of targets embedded in a multilayered media is presented. The imaging algorithm is based on the first-order Born approximation and exploits the spectral multilayered media Green's function. The exploding reflection model is employed and then the Green's function is expanded in the spectral form to facilitate the easy implementation of the imaging algorithm with fast Fourier transform (FFT). The wave propagation effect due to the presence of the layered subsurface media is automatically taken into account in the imaging formulation through the multilayer media Green's function. The linearization of the inversion scheme and employment of FFT make the imaging algorithm suitable in several applications concerning the diagnostics of large probed domain and allow real-time processing. Representative examples are presented to show the effectiveness and efficiency of the proposed algorithm for radar imaging through multilayered media.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Microwave Tomographic Algorithm for Radar Imaging Through Multilayered Media

Zhang¹

2014

PIER

View full text Add to dashboard Cite

show abstract

“…To investigate the potential of AMT for inspection of rehabilitated structures, a small concrete sample with dimensions of 30×30×5 cm 3 , partially covered by a CFRP sheet, is considered. The CFRP sheet has dimensions of 20×20×0.2 cm 3 , and contains a delamination (cross sectional area of 4×4 cm 2 and depth of 2 mm), with a center offset point of 3 cm with respect to the center point of the SUT in both the x-and y-directions.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Health monitoring of rehabilitated infrastructure is quite important to ensure the structural integrity of composite (including carbon fiber-based composites) and cement-based (e.g., concrete) infrastructure. Several nondestructive testing (NDT) methods including microwave [1]- [3], ultrasound [4], x-ray [5], and thermography [6]- [7] have been applied for inspection of composite and concrete structures with varying levels of success. For example, while sonic (ultrasound) methods are well-established, typically they require contact with the structure under test (SUT), which may limit their application [4].…”

Section: Introductionmentioning

confidence: 99%

Application of Active Microwave Thermography to delamination detection

Foudazi

Donnell

Ghasr

2014

2014 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings

Self Cite

View full text Add to dashboard Cite

Abstract-Health monitoring of infrastructure is very important in the transportation and infrastructure industries. Many nondestructive testing (NDT) techniques have been applied for structural health monitoring including microwave NDT, ultrasound, thermography, etc. Due to the complex materials (composites, concrete, etc.) commonly used, it may be difficult to thoroughly inspect a structure using one method alone. Thus, hybrid NDT methods have also been developed. Recently, the integration of microwave NDT and thermography, herein referred to as Active Microwave Thermography (AMT), has also been considered as a potential structural health monitoring tool. This hybrid method uses microwave energy to heat a structure of interest, and then the thermal surface profile is measured using a thermal camera. This paper investigates the potential of AMT to inspect rehabilitated cement-based structures. Preliminary simulations and measurements provided herein indicate that AMT has the potential to detect delaminations under carbon fiber patches bonded to concrete.

show abstract

“…To that end, an imaging domain is established by dividing into pixels of 1 mm 2 , with an assumed initial dielectric constant of ε and magnetic constant of μ ( Fig. 5.19), and the intensity of energy of each point scatterer/pixel is then estimated [138] .…”

Section: Imaging Algorithmmentioning

confidence: 99%

Wideband Microwave Imaging Systems for the Diagnosis of Fluid Accumulation in the Human Torso

Rezaeieh¹

View full text Add to dashboard Cite

According to the World Health Organization (WHO), cardiovascular diseases (CVDs) are the leading causes of death worldwide, with one third of deaths attributed to CVDs in 2012. Pulmonary oedema and pleural effusion are the most apparent symptoms of many diseases categorized under CVDs such as heart failure and lung cancer, at which fluid (mainly with high water content) is accumulated in or around the lungs. Therefore, constant monitoring of fluid levels inside the lungs is one of the most efficient ways of early detection of CVDs. Chest X-Rays and computational tomography (CT)-scans are the most widely used devices for fluid detection; however, they suffer from lack of sensitivity and ionizing radiation, respectively, that makes them unsuitable for long term monitoring purposes. Currently, magnetic resonance imaging (MRI) is the most reliable device that can be utilized for fluid accumulation detection. However, considering the fact that more than 75% of the CVDs occur in countries with low or middle income, it is not widely available. Moreover, due to their bulky structures, the abovementioned devices lack the capability of being used in mobile emergency units such as ambulances or clinics at rural areas. To that end, this thesis is dedicated to design and fabrication of a low cost, portable and non-invasive device that can be used as an initial decision making tool for medical staff to pursue further investigations to define the exact cause of the oedema.First chapter of the thesis is allocated to introduction of the cardiovascular diseases and their effects on the dielectric properties of the tissues inside the lungs. A complete literature review on various alternative methods for replacing the conventional devices is performed. The obtained results by these systems and their advantages as well as their limitations are discussed. Microwave imaging technique is then presented in chapter two as a robust method which can both provide information about the presence and location of the accumulated fluid. This is specifically of great importance for cases where biopsy is required to remove or take sample of the accumulated fluid for saving the life of the patient. Chapter two is also allocated to the introduction of microwave-based medical diagnostic and monitoring systems for different applications such as breast cancer detection and brain imaging. A prospect of the possible realizable systems is investigated and existing scanning approaches are discussed. The main contributions of the thesis that are the design of several complete platforms, design of novel and unidirectional microwave sensors (antennas), promotion of novel scanning and detection methods are clarified in these chapters.In chapter three, firstly the optimum operating frequency for torso imaging is defined. By applying a circuit model that models different layers of torso as circuit elements, it is shown that a wide operating bandwidth at lower ultra-high frequency (UHF) band provides a reasonable III compensation between the resolution of...

show abstract

Piecewise and Wiener Filter-Based SAR Techniques for Monostatic Microwave Imaging of Layered Structures

Cited by 119 publications

References 35 publications

Two-Dimensional Microwave Tomographic Algorithm for Radar Imaging Through Multilayered Media

Two-Dimensional Microwave Tomographic Algorithm for Radar Imaging Through Multilayered Media

Application of Active Microwave Thermography to delamination detection

Wideband Microwave Imaging Systems for the Diagnosis of Fluid Accumulation in the Human Torso

Contact Info

Product

Resources

About