&lt;title&gt;Embedded modulating dipole scattering for near-field microwave inspection of concrete: preliminary investigations&lt;/title&gt;

Joisel, A.; Bois, K.J.; Benally, Aaron D.; Bolomey, Jean-Charles; Zoughi, R.

doi:10.1117/12.365700

Cited by 9 publications

(5 citation statements)

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“…MST probes have found applications in NDT&E by being used as sensors for dielectric properties, corrosion and disbonds [199–205]. By being embedded into structures, they can be used to sense local structural integrity and perform monitoring over time [199,206–209]. While these sensors haven't come into practical use, they have laid the foundation for other embedded microwave sensors [210].…”

Section: Sensors and Sensingmentioning

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: Sensors and Sensingmentioning

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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“…The idea of using the MST for scattering applications was suggested by several proposals appeared in the scientific literature [4], [5]. A preliminary version of an imaging apparatus based on the MST was proposed by two of these authors in [6].…”

Section: Introductionmentioning

confidence: 99%

A passive antenna system for data acquisition in scattering applications

Caorsi

Donelli²,

Pastorino³

2002

Antennas Wirel. Propag. Lett.

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This letter describes a passive antenna system based on the modulated scattering technique (MST) implemented in the bistatic configuration. The system uses an array of passive dipoles driven by optical fibers. The array can move and rotate around a square test area and it is possible to measure field-scattered data by cylindrical targets placed inside the test area. Some preliminary experimental results are presented and compared with analytical data. The measurements are in good agreement with theoretical values.

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“…Previous applications of this technique include antenna pattern measurements, nondestructive testing and biomedical imaging [16]. The combination of tradition microwave NDT measurements and embedding an MST probe in a material has been shown in the past as an novel means of determining the local dielectric properties of a material, and monitoring changes in the dielectric constant of a material [17]. Furthermore, multiple measurements can be recorded rapidly using this technique, and coherent averaging of the modulated signals can be used to increase the signal-to-noise ratio of the measurements.…”

Section: Introductionmentioning

confidence: 99%

“…The dielectric constant of a material can be determined in a variety of ways using this technique. Previous investigations have shown the capability to detect with high sensitivity slight variations in the dielectric properties of a material, and to determine the dielectric constant of a material through a variety of approaches [17][18][19]. The previous results of these have shown mixed level of success for determining the dielectric properties of a material.…”

Section: Introductionmentioning

confidence: 99%

Near-Field Microwave and Embedded Modulated Scattering Technique (MST) for Dielectric Characterization of Materials

Hughes

Zoughi

2003

AIP Conference Proceedings

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Several approaches to using combined near-field microwave NDT techniques, utilizing openended rectangular waveguides, and embedded modulated scatterer technique (MST) for the determination of the dielectric properties of a material have been investigated in the past. A technique currently under investigation involves using the ratio of dynamic forward-and reverse-biased reflection coefficients, measured at the aperture of the waveguide. One important aspect of this method is that the ratio of reflection coefficients is not a function of the relative location or polarization of MST probe to the waveguide, Formulation of the ratio of dynamic reflection coefficients is presented, as well as preliminary measurements showing the coherent ratio of reflection coefficients to be relatively constant as a function of location in freespace.

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<title>Embedded modulating dipole scattering for near-field microwave inspection of concrete: preliminary investigations</title>

Cited by 9 publications

References 0 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

A passive antenna system for data acquisition in scattering applications

Near-Field Microwave and Embedded Modulated Scattering Technique (MST) for Dielectric Characterization of Materials

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