Near-Field Three-Dimensional Planar Millimeter-Wave Holographic Imaging by Using Frequency Scaling Algorithm

Zhang, Ye; Deng, Bin; Yang, Qi; Gao, Jingkun; Qin, Yuliang; Wang, Hongqiang

doi:10.3390/s17102438

Cited by 10 publications

(6 citation statements)

References 20 publications

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“…To achieve highly accurate detection results, it is crucial to obtain a high-resolution, 2D image with clear target features. Currently, numerous scholars have devoted significant efforts to achieve high-quality 2D imaging by enhancing techniques, such as backprojection algorithms [ 29 ], frequency scaling algorithms [ 30 ], and holographic imaging algorithms [ 31 ]. The objective is to improve the signal-to-noise ratio and enhance image features.…”

Section: Methods Of Spectral Reconstruction Imaging and Quantitative ...mentioning

confidence: 99%

Visual Quantitative Detection of Delamination Defects in GFRP via Microwave

Yang

Wang

et al. 2023

Sensors

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Glass Fiber reinforced polymers (GFRPs) are widely used and play an important role in modern society. The multilayer structure of GFRPs can lead to delamination defects during production and service, which can have a significant impact on the integrity and safety of the equipment. Therefore, it is important to monitor these delamination defects during equipment service in order to evaluate their effects on equipment performance and lifespan. Microwave imaging testing, with its high sensitivity and noncontact nature, shows promise as a potential method for detecting delamination defects in GFRPs. However, there is currently limited research on the quantitative characterization of defect images in this field. In order to achieve visual quantitative nondestructive testing (NDT), we propose a 2D-imaging visualization and quantitative characterization method for delamination defects in GFRP, and realize the combination of visual detection and quantitative detection. We built a microwave testing experimental system to verify the effectiveness of the proposed method. The results of the experiment indicate the effectiveness and innovation of the method, which can effectively detect all delamination defects of 0.5 mm thickness inside GFRP with high accuracy, the signal-to-background ratio (SBR) of 2D imaging can reach 4.41 dB, the quantitative error of position is within 0.5 mm, and the relative error of area is within 11%.

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Section: Methods Of Spectral Reconstruction Imaging and Quantitative ...mentioning

confidence: 99%

Visual Quantitative Detection of Delamination Defects in GFRP via Microwave

Yang

Wang

et al. 2023

Sensors

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“…Currently, the more mature active mmW imaging systems use SAR to achieve large aperture and digital focusing to reconstruct image for portal personnel security screening. More specifically, the monostatic array is the most common configuration because of simple structure and low cost in the existing mmW imaging systems [5], [35], [58], [59], [60]. Generally, a linear antenna array is electronically scanned over an axis, e.g., horizontal axis, while the linear array is mechanically wept over another axis, e.g., vertical axis.…”

Section: B Digital Focusing In Monostatic Arraymentioning

confidence: 99%

Review of Active Millimeter Wave Imaging Techniques for Personnel Security Screening

Wang

Cui

2019

IEEE Access

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This paper reviews recent progress of active millimeter wave (mmW) imaging techniques for personnel security screening. With the ability to penetrate clothing and the promised millimeter scale spatial resolution, mmW imaging has been widely pursued for personnel surveillance without the usual concern for radiation safety. A brief development history of mmW imaging is introduced. An overview of imaging research and developmental achievements, along with antenna considerations based on quasi-optical geometry, phased reflector array, monostatic array, and multistatic array, is provided. Design considerations related to practical applications, including system calibrations, walk-through system (WTS), portable system, and compressive sensing (CS), are also discussed. INDEX TERMSMillimeter wave imaging, personnel security screening, review.

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“…The corresponding imaging algorithms for these SISO-based systems have also been studied by many researchers [7], [8]. In most cases, they can be obtained by generalizing the classical 2D SAR imaging algorithms to 3D cases [9], [10].…”

Section: Introductionmentioning

confidence: 99%

Near-Field 3D SAR Imaging Using a Scanning Linear MIMO Array With Arbitrary Topologies

et al. 2020

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For near-field synthetic aperture radar (SAR) imaging, frequency domain imaging algorithms typically require the array elements to be uniformly arranged to facilitate the application of fast Fourier transform (FFT) operations; this greatly restricts the array types that can be used for practical applications. For arrays with non-uniformly positioned antennas, no general and efficient imaging algorithm is available yet. To address this issue, an effective algorithm for efficient three-dimensional (3D) SAR imaging with arbitrary linear multi-input-multi-output (MIMO) array topologies is proposed. Specifically, non-uniform FFT (NUFFT) technology is utilized to tackle the non-uniform sampling issues in both the spatial and the wavenumber domain. Despite the intuitive idea, to achieve satisfied imaging, some issues are non-trivial and should be carefully addressed. Both simulations and experiments show the superiority of the proposed algorithm on computational complexity while maintain the same high imaging precision compared with the back-projection algorithm (BPA). Moreover, we suggest that the concept of NUFFT-based imaging can also be generalized to other imaging regimes with arbitrary array configurations. INDEX TERMS Radar imaging, multi-input-multi-output, synthetic aperture, array topology, millimeterwave imaging.

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Near-Field Three-Dimensional Planar Millimeter-Wave Holographic Imaging by Using Frequency Scaling Algorithm

Cited by 10 publications

References 20 publications

Visual Quantitative Detection of Delamination Defects in GFRP via Microwave

Visual Quantitative Detection of Delamination Defects in GFRP via Microwave

Review of Active Millimeter Wave Imaging Techniques for Personnel Security Screening

Near-Field 3D SAR Imaging Using a Scanning Linear MIMO Array With Arbitrary Topologies

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