A Synthetic Aperture Radar (SAR)-Based Technique for Microwave Imaging and Material Characterization

Álvarez-López, Yuri; Fernandez, Maria G. Salas; Grau, Raphael; Las-Heras, Fernando

doi:10.3390/electronics7120373

Cited by 10 publications

(5 citation statements)

References 24 publications

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“…This approach, which is very recent, uses a waveguide or horn antenna as the transducer rather than a near-field probe, meaning that this method is inherently more broadband than the near-field resonant probes used in microwave microscopy. While the method discussed in [126] provides only one complex permittivity value for the MUT, the method proposed in [21,127] can provide a distribution of dielectric properties for the MUT. In general, this technique shows great potential for spatially mapping dielectric properties in MUTs in a non-contact non-destructive manner.…”

Section: Materials Characterizationmentioning

confidence: 99%

Review of advances in microwave and millimetre-wave NDT&E: principles and applications

Brinker

Dvorsky

Ghasr

et al. 2020

Phil. Trans. R. Soc. A.

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Microwave and millimetre-wave non-destructive testing and evaluation (NDT&E) has a long history dating back to the late 1950s (Bahr 1982 Microwave non-destructive testing methods ; Zoughi 2000 Microwave Non-destructive testing and evaluation principles ; Feinstein 1967 Surface crack detection by microwave methods ; Ash 1973 In 3rd European Microwave Conference ; Auld 1981 Phys. Technol. 12 , 149–154; Case 2017 Mater. Eval. 75 ). However, sustained activities in this field date back to the early 1980s (Zoughi 1995 Res. Nondestr. Eval. 7 , 71–74; Zoughi 2018 Mater. Eval. 76 , 1051–1057; Kharkovsky 2007 IEEE Instrumentation & Measurement Magazine 10 , 26–38). Owing to various limitations associated with using microwaves and millimetre waves for NDT&E, these techniques did not see much utility in the early days. However, with the advent and prevalence of composite materials and structures, in a wide range of applications, and technological advances in high-frequency component design and availability, these techniques are no longer considered as ‘emerging techniques’ (Zoughi 2018 Mater. Eval. 76 , 1051–1057; Schull 2002 Nondestructive evaluation: theory, techniques, and applications ). Currently, microwave and millimetre-wave NDT&E is a rapidly growing field and has been more widely acknowledged and accepted by practitioners over the last 25+ years (Case 2017 Mater. Eval. 75 ; Bakhtiari 1994 IEEE Trans. Microwave Theory Tech . 42 , 389–395; Bakhtiari 1993 Mater. Eval. 51 , 740–743; Bakhtiari 1993 IEEE Trans. Instrum. Meas. 42 , 19–24; Ganchev 1995 IEEE Trans. Instrum. Meas. 44 , 326–328; Bois 1999 IEEE Trans. Instrum. Meas. 48 , 1131–1140; Ghasr 2009 IEEE Trans. Instrum. Meas. 58 , 1505–1513). Microwave non-destructive testing was recently recognized and designated by the American Society for Nondestructive Testing (ASNT) as a ‘Method’ on its own (Case 2017 Mater. Eval. 75 ). These techniques are well suited for materials characterization; layered composite inspection for thickness, disbond, delamination and corrosion under coatings; surface-breaking crack detection and evaluation; and cure-state monitoring in concrete and resin-rich composites, to name a few. This work reviews recent advances in four major areas of microwave and millimetre-wave NDT&E, namely materials characterization, surface crack detection, imaging and sensors. The techniques, principles and some of the applications in each of these areas are discussed. This article is part of the theme issue ‘Advanced electromagnetic non-destructive evaluation and smart monitoring’.

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Section: Materials Characterizationmentioning

confidence: 99%

Review of advances in microwave and millimetre-wave NDT&E: principles and applications

Brinker

Dvorsky

Ghasr

et al. 2020

Phil. Trans. R. Soc. A.

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“…After a very careful peer-review process, a total of 32 papers were accepted. These works include SAR/ISAR [2][3][4][5][6][7][8][9], polarimetry [10][11][12], MIMO [13,14], direction of arrival (DOA)/direction of departure (DOD) [13][14][15], sparse sensing [5,14,16], ground-penetrating radar (GPR) [17][18][19], through-wall radar [20,21], coherent integration [22,23], clutter suppression [24,25], and meta-materials, among others [26][27][28][29][30][31]. All of these accepted papers are the latest research results and are expected to be further advanced, applied, and diverted.…”

Section: The Present Issuementioning

confidence: 99%

Special Issue on “Advanced Technology Related to Radar Signal, Imaging, and Radar Cross-Section Measurement”

Kobayashi

Moriyama

2020

Electronics

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“…2 of 17 To underpin this rapid expansion, growing attention is being paid to the study and design of microwave electronics devices, circuits, and systems, thereby enabling the development of microwave electronics techniques oriented to applications in life sciences. In this context, a pivotal role is played by high-frequency sensors, going from radar systems (e.g., [2][3][4][5][6]) to biological sensors (e.g., [7][8][9][10][11][12][13][14]). Among the various applications in which high-frequency sensors can be useful, there is a significant use of microwave biological sensors in dielectric spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Biosensor Using a One-Port Interdigital Capacitor: A Resonance-Based Investigation of the Permittivity Sensitivity for Microfluidic Broadband Bioelectronics Applications

et al. 2020

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Electronics is a field of study ubiquitous in our daily lives, since this discipline is undoubtedly the driving force behind developments in many other disciplines, such as telecommunications, automation, and computer science. Nowadays, electronics is becoming more and more widely applied in life science, thus leading to an increasing interest in bioelectronics that is a major segment of bioengineering. A bioelectronics application that has gained much attention in recent years is the use of sensors for biological samples, with emphasis given to biosensors performing broadband sensing of small-volume liquid samples. Within this context, this work aims at investigating a microfluidic sensor based on a broadband one-port coplanar interdigital capacitor (IDC). The microwave performance of the sensor loaded with lossless materials under test (MUTs) is achieved by using finite-element method (FEM) simulations carried out with Ansoft's high frequency structure simulator (HFSS). The microfluidic channel for the MUT has a volume capacity of 0.054 µL. The FEM simulations show a resonance in the admittance that is reproduced with a five-lumped-element equivalent-circuit model. By changing the real part of the relative permittivity of the MUT up to 70, the corresponding variations in both the resonant frequency of the FEM simulations and the capacitance of the equivalent-circuit model are analyzed, thereby enabling assessment of the permittivity sensitivity of the studied IDC. Furthermore, it is shown that, although the proposed local equivalent-circuit model is able to mimic faithfully the FEM simulations locally around the resonance in the admittance, a higher number of circuit elements can achieve a better agreement between FEM and equivalent-circuit simulation over the entire broad frequency going range from 0.3 MHz to 35 GHz.

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A Synthetic Aperture Radar (SAR)-Based Technique for Microwave Imaging and Material Characterization

Cited by 10 publications

References 24 publications

Review of advances in microwave and millimetre-wave NDT&E: principles and applications

Review of advances in microwave and millimetre-wave NDT&E: principles and applications

Special Issue on “Advanced Technology Related to Radar Signal, Imaging, and Radar Cross-Section Measurement”

Biosensor Using a One-Port Interdigital Capacitor: A Resonance-Based Investigation of the Permittivity Sensitivity for Microfluidic Broadband Bioelectronics Applications

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