Three‐dimensional holographic imaging using data collected over cylindrical apertures

Amineh, Reza K.; Ravan, Maryam; Wu, Hailun; Kasturi, Aakarsha

doi:10.1002/mop.31694

Cited by 10 publications

(6 citation statements)

References 11 publications

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“…The following derivation of QMH applies to planar apertures (along x, y, range along z), though formulations of QMH for cylindrical apertures are also available [40], [41]. QMH relies on the measurements of three separate objects for image reconstruction, the reference object (RO), the CO, and the OUT.…”

Section: A Measurement Setupmentioning

confidence: 99%

Accurate Range Migration for Fast Quantitative Fourier-Based Image Reconstruction With Monostatic Radar

Tajik

Kazemivala

Nguyen

et al. 2022

IEEE Trans. Microwave Theory Techn.

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Range migration (or range focusing) techniques are widely used in optical, acoustic, and microwave real-time image reconstruction methods. They have been successfully applied to far-field 3-D imaging where they rely on planewave assumptions, which ignore the data amplitude variation over the acquisition aperture. The accuracy of the plane-wave assumption, however, quickly degrades in close-range imaging, where amplitude variations are significant and where the range to the target is on the order of the range sampling step. Here, we present a range-focusing method of improved accuracy, which is applicable to both far-zone and close-range monostatic radar. It refocuses the system point-spread function (PSF) to any range location, taking into account both magnitude and phase changes. The approach can be applied with any Fourier-based imaging algorithm utilizing the Lippmann-Schwinger equation as the underlying scattering model. Here, it is validated through examples based on simulated and measured data where the images are reconstructed with quantitative microwave holography (QMH). QMH employs measured PSFs to achieve quantitative imaging in real-time. The proposed range-migration method is applicable with measured PSFs, too, leading to reduced system-calibration effort and the ability to focus an image at any desired range.

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Section: A Measurement Setupmentioning

confidence: 99%

Accurate Range Migration for Fast Quantitative Fourier-Based Image Reconstruction With Monostatic Radar

Tajik

Kazemivala

Nguyen

et al. 2022

IEEE Trans. Microwave Theory Techn.

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“…This has been notified in the previous works as well (e.g., see ref. [18]). Also, it is observed that the quality of the imaging improves when using double frequency data compared to single frequency data.…”

Section: D Imaging Of Larger Objectsmentioning

confidence: 99%

“…To address the above-mentioned needs for fast and robust near-field microwave imaging, holographic imaging techniques have been adapted for such applications. In near-filed holographic microwave imaging, back-scattered signals are collected over rectangular [14][15][16] or cylindrical [17,18] apertures and reconstruction can be performed to volumetrically image the dielectric bodies. A summary of near-field microwave holographic imaging techniques can be found in ref.…”

Section: Introductionmentioning

confidence: 99%

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A Low-Cost and Compact Three-Dimensional Microwave Holographic Imaging System

Amineh

2019

Electronics

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With the significant growth in the use of non-metallic composite materials, the demands for new and robust non-destructive testing methodologies is high. Microwave imaging has attracted a lot of attention recently for such applications. This is in addition to the biomedical imaging applications of microwave that are also being pursued actively. Among these efforts, in this paper, we propose a compact and cost-effective three-dimensional microwave imaging system based on a fast and robust holographic technique. For this purpose, we employ narrow-band microwave data, instead of wideband data used in previous three-dimensional cylindrical holographic imaging systems. Three-dimensional imaging is accomplished by using an array of receiver antennas surrounding the object and scanning that along with a transmitter antenna over a cylindrical aperture. To achieve low cost and compact size, we employ off-the-shelf components to build a data acquisition system replacing the costly and bulky vector network analyzers. The simulation and experimental results demonstrate the satisfactory performance of the proposed imaging system. We also show the effect of number of frequencies and size of the objects on the quality of reconstructed images.

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“…Wide-band SAR imaging has been used to produce three-dimensional (3D) images of the vertical cracks/flaws in fat and curved HDPE pipes [8]. Recently, SAR-based imaging techniques have been extended to the near-field applications where the distance between the measuring antennas and the imaged object is small (e.g., see [9,10]). Thus, these techniques can be called near-field holographic imaging techniques where the information related to a specific imaging system is obtained a priori through the measurement of the so-called point-spread functions (PSFs) [11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Eccentricity in Microwave Imaging of Multiple Composite Pipes

Gao

Raisa

Amineh

2021

CUSJ

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The use of non-metallic composites that are durable, low cost, and lightweight is growing fast in various industries. A commonly used form of these materials is in the shape of pipes that can be used, for instance, in oil and gas industry. Such pipes can be damaged due to material loss (defects and holes), erosions, and more which may cause major production failures or environmental mishaps. To prevent these issues, non-destructive testing (NDT) methods need to be employed for regular inspections of such components. Since traditional NDT methods are mainly used for metallic pipes, recently microwave imaging has been proposed as a promising approach for examination of non-metallic pipes. While microwave imaging can be employed for inspection of multiple layers of pipes, the effect of undesired eccentricity of the pipes can impose additional imaging errors. In this paper, for the first time, we study the effect of eccentricity of the pipes on the images reconstructed using near-field holographic microwave imaging when imaging double pipes.

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Three‐dimensional holographic imaging using data collected over cylindrical apertures

Cited by 10 publications

References 11 publications

Accurate Range Migration for Fast Quantitative Fourier-Based Image Reconstruction With Monostatic Radar

Accurate Range Migration for Fast Quantitative Fourier-Based Image Reconstruction With Monostatic Radar

A Low-Cost and Compact Three-Dimensional Microwave Holographic Imaging System

Effect of Eccentricity in Microwave Imaging of Multiple Composite Pipes

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