Covered Cracks Detection Using Dual-Polarization Synthetic Aperture Radar Imaging

Abou‐Khousa, Mohamed A.; Rahman, Mohammed Saif ur

doi:10.1109/tim.2021.3088468

Cited by 13 publications

(10 citation statements)

References 18 publications

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“…These methods demonstrated a capability to detect and characterize 50-µm-wide slots with depths ranging from ∼25 µm to 5 mm [16]. Also, the far-field methods include the recently proposed exposed/covered crack detection techniques based on synthetic aperture radar (SAR) imaging [18], [19], [20], [21], [22], [23], [24], [25].…”

Section: A Far-field Methodsmentioning

confidence: 99%

“…Fig. 6(a) shows the setup of a recently reported polarimetric SAR method developed to detect cracks covered under thick insulation in the K-band frequency range (18-26.5 GHz) [24]. Fig.…”

Section: A Far-field Methodsmentioning

confidence: 99%

“…Today, there is a wide range of microwave and millimeter-wave crack detection and characterization methods. The majority of the reported methods are categorized in this article as far-field [15], [16], [17], [18], [19], [20], [21], [22], [23], [24], [25], near-field [26], [27], [28], [29], [30], [31], [32], [33], [34], [35], [36], [37], [38], [39], [40], [41], [42], [43], [44], [45], [46], [47], [48], [49], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59], [60], [61], [62], [63],…”

mentioning

confidence: 99%

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Detection of Surface Cracks in Metals Using Microwave and Millimeter-Wave Nondestructive Testing Techniques—A Review

Abou‐Khousa

Rahman

Donnell

et al. 2023

IEEE Trans. Instrum. Meas.

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Integrity assessment of metallic structures requires inspection tools capable of detecting and evaluating cracks reliably. To this end, many microwave and millimeter-wave nondestructive testing and evaluation (NDT&E) methods have been developed and applied successfully in the past. Detection of fatigue cracks with widths less than 5 µm using noncontact microwave-based inspection methods was demonstrated in the 1970s. Since their introduction, these methods have evolved considerably toward enhancing the detection sensitivity and resolution. Undertaking key application challenges has attracted considerable attention in the past three decades and led to the development of the near-field techniques for crack detection. To address a need that cannot be fulfilled by other NDT&E modalities, innovative noncontact microwave and millimeter-wave NDT&E methods were devised recently to detect cracks of arbitrary orientations under thick dielectric structures. While the reported methods share the same underlying physical principles, they vary considerably in terms of the devised probes/sensors and the application procedure. Consequently, their sensitivity and resolution as well as their limitations vary. This article reviews the various crack detection methods developed to-date and compares them in terms of common performance metrics. This comprehensive review is augmented with experimental comparisons and benchmarking aimed to benefit NDT&E practitioners and researchers alike.

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Section: A Far-field Methodsmentioning

confidence: 99%

“…Fig. 6(a) shows the setup of a recently reported polarimetric SAR method developed to detect cracks covered under thick insulation in the K-band frequency range (18-26.5 GHz) [24]. Fig.…”

Section: A Far-field Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Detection of Surface Cracks in Metals Using Microwave and Millimeter-Wave Nondestructive Testing Techniques—A Review

Abou‐Khousa

Rahman

Donnell

et al. 2023

IEEE Trans. Instrum. Meas.

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“…It reflects maximally when the incident electric field is aligned parallel to it. By decomposing the incident field vector over the trace, the cross-polarization transmission coefficient (vertical-tohorizontal) when the trace is positioned under the antenna can be found as [20], [21],…”

Section: Sensing Conceptmentioning

confidence: 99%

Polarimetric Microwave Sensor for Angular Speed Measurement

2022

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This paper presents a design methodology and prototyping of an angular speed sensor based on microwave polarimetry. The detection mechanism relies on the transmission response of a dual-polarized circular aperture irradiating an array of regularly spaced copper traces. The generated response is a regular pulse train defined by the location of a copper trace with reference to the center of the circular aperture. For speed measurement, the response was acquired within a 10s duration with the circular aperture response effectively sampled at 100 Hz. The acquired response was analyzed in the frequency domain using Fast Fourier Transform (FFT) and the rotor speed was obtained from the frequency spectrum of the acquired pulse train. The detection system can detect speeds as low as 0.4 RPM with an upper limit of 5000 RPM limited by the maximum sampling rate of the acquisition system. With the adoption of the FFT technique for speed estimation, the proposed angular speed measurement system can instantaneously detect angular speed with a maximum absolute estimation error of 0.0625 RPM within the 10 s acquisition time. The rotor occupies an area of 84.64 cm 2 .

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“…IGH-resolution near-field microwave imaging methods are emerging as powerful inspection tools for diverse industrial applications. These methods have been successfully applied for non-destructive testing (NDT) of metal structures to detect surface defects such as cracks [1]- [9] and precursor pits [10], [11], map corrosion and rust under paint [12]- [13], and inspect composite materials for subsurface defects [14]- [17], among others. For these applications, the practical utility of near-field microwave imaging as an inspection modality and its merits compared to other well-known NDT modalities such as phased array ultrasonic testing have been demonstrated recently [14], [16].…”

Section: Introductionmentioning

confidence: 99%

Crack Detection and Corrosion Mapping Using Loaded-Aperture Microwave Probe

Rahman

Hassan

Abou‐Khousa

2022

IEEE Open J. Instrum. Meas.

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Employing circular aperture probes for microwave imaging in the near-field has been proven to render high resolution images of a variety of samples under test (SUT) when compared to the conventionally utilized rectangular aperture probes. In this paper, it is proposed to further enhance the near-field imaging resolution and sensitivity by loading the circular aperture (operating in the K-band frequency range) with a resonant iris. It is shown that the probe exhibits a confined and localized near-field distribution close to the iris opening, thereby improving its resolution and sensitivity. The design and analysis of the probe presented herein are aided by 3D electromagnetic simulations and validated experimentally. The spatial resolution of the probe is established through line scans of the probe over a pair of targets interspaced at known distances. To further demonstrate the utility of the probe in critical non-destructive testing (NDT) applications, a manufactured prototype is devised to detect cracks on metal structures and map corrosion areas hidden under paint layers. It is shown here that the proposed probe provides significant resolution and sensitivity improvement over the un-loaded circular aperture probe. Specifically, for crack detection, the proposed probe provides two-fold and more than three-fold improvement in the resolution and sensitivity, respectively. For corrosion mapping, the proposed probe yields 2 to 5 times higher image signal-to-noise ratio compared to the unloaded aperture probe.

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Covered Cracks Detection Using Dual-Polarization Synthetic Aperture Radar Imaging

Cited by 13 publications

References 18 publications

Detection of Surface Cracks in Metals Using Microwave and Millimeter-Wave Nondestructive Testing Techniques—A Review

Detection of Surface Cracks in Metals Using Microwave and Millimeter-Wave Nondestructive Testing Techniques—A Review

Polarimetric Microwave Sensor for Angular Speed Measurement

Crack Detection and Corrosion Mapping Using Loaded-Aperture Microwave Probe

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