High-Resolution UHF Near-Field Imaging Probe

Abou‐Khousa, Mohamed A.; Shafi, K. T. Muhammed; Xingyu, Xie

doi:10.1109/tim.2018.2815437

Cited by 42 publications

(19 citation statements)

References 19 publications

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“…Fig. 18 in [19]). Akin to the sample considered in [4] and [20], the second sample consists of a carbon steel substrate with localized corrosion hidden under thin paint layer.…”

Section: Inspection Applicationsmentioning

confidence: 97%

“…As shown in the acquired imaged using probe C, all defects were detected even when they are almost covered by corrosion. The produced image using probe C is of higher quality (a) (b) (resolution and dynamic range) compared to the probe considered in [19] (c.f. Fig.…”

Section: Inspection Applicationsmentioning

confidence: 99%

“…The dimensions d1 × d2 of the investigated probes are reported in TABLE 2. It is remarked here that Probe A is basically similar to the probes considered in [19] but with printed feeding loop instead of wire loop used in [19].…”

Section: Probe Model and Prototypesmentioning

confidence: 99%

“…The resolution of the planar resonator probes developed previously was limited to 5 mm [19], [20]. However, a nearfield imaging probe that could offer imaging resolution in the range of few millimeters (e.g., 2 -3 mm) with a polarizationindependent response and high overall sensitivity is yet to be demonstrated.…”

Section: Introductionmentioning

confidence: 99%

“…To address this need, an optimized planar resonator probe consisting of a loop loaded with a spiral resonator (SR) will be introduced in this paper. The effect of dimensional reduction on the resolution of the SR-loaded loop reported in [19], [20] will be investigated based on numerical simulations and experimental results. The nearfield imaging performance of the optimized planar probe will be compared to conventional aperture probes working at 24 GHz, 33 GHz, and 70 GHz while considering metallic as well as dielectric samples.…”

Section: Introductionmentioning

confidence: 99%

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High Resolution and Polarization Independent Microwave Near-Field Imaging Using Planar Resonator Probes

et al. 2020

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Various near-field microwave imaging probes were developed previously for nondestructive testing of material structures. Sensitivity and resolution are key parameters for quantifying the efficacy of a given imaging probe. For polarized targets like cracks, the sensitivity of conventional aperture probes depends on the relative orientation between the probe's electric-field vector and the target. In practice, target orientation is typically unknown. Furthermore, the imaging resolution of conventional aperture probes is limited to aperture dimensions. Obtaining imaging resolution in the order of few millimeters using conventional aperture probes requires operation at high frequencies, (above 30 GHz). In contrast, planar probes consisting of loops loaded with spiral resonators could provide resolution in the order of few millimeters while working at relatively low frequencies (below 1 GHz). Unlike conventional aperture probes, the radiated near-fields of these probes are characterized by two significant components oriented along orthogonal axes. Therefore, the probe intrinsically provides a polarization-independent response. In this paper, the near-field imaging resolution of the planar resonator probe is further enhanced, and its polarizationindependent response is demonstrated for the first time. The response of three planar probe prototypes of different dimensions is analyzed based on numerical simulation and experimental results. The performance of the probes is extensively evaluated by acquiring line-scans and 2D-images of metal and dielectric samples. The near-field images of the metal sample obtained using the planar probes working below 1 GHz are compared to the images obtained using aperture probes working at 24 GHz, 33 GHz, and 70 GHz. Furthermore, the probe imaging performance for a polarized target (i.e., narrow cuts) is compared to dualpolarized circular probe working at 24 GHz and open-ended coaxial probe working at 10 GHz. Overall, the proposed probe yielded more than twofold increase in the image signal-to-noise ratio (SNR) compared to all the probes utilized herein. INDEX TERMS non-destructive testing, microwave imaging, planar probe, near-field, polarization, spiral resonator This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.

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“…Fig. 18 in [19]). Akin to the sample considered in [4] and [20], the second sample consists of a carbon steel substrate with localized corrosion hidden under thin paint layer.…”

Section: Inspection Applicationsmentioning

confidence: 97%

Section: Inspection Applicationsmentioning

confidence: 99%