Extended Non-Stationary Phase-Shift Migration for Ultrasonic Imaging of Irregular Surface Component

Chang, Jie; Chen, Zhiheng; Luo, Wenbin; Zhong, Hai-ying; Lü, Chao

doi:10.1109/access.2020.3047021

Cited by 8 publications

(2 citation statements)

References 31 publications

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“…Additionally, phase shift plus interpolation (PSPI) and nonstationary phase shift migration (NSPSM) were studied [23,27], both incorporating a window function to filter the wavefield based on sound speed distribution. Lukomski employed PSPI for full-matrix imaging, and NSPSM in UNDT was studied by Chang et al in 2021 [28][29][30]. Despite their ability to address lateral sound speed variation, these methods face limitations in large-angle oblique incidence (characterized by lateral sound speed variation).…”

Section: Introductionmentioning

confidence: 99%

Full-Matrix Imaging in Fourier Domain towards Ultrasonic Inspection with Wide-Angle Oblique Incidence for Welded Structures

Chen,

Xu,

Yang

et al. 2024

Sensors

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The total focusing method (TFM) has been increasingly applied to weld inspection given its high image quality and defect sensitivity. Oblique incidence is widely used to steer the beam effectively, considering the defect orientation and structural complexity of welded structures. However, the conventional TFM based on the delay-and-sum (DAS) principle is time-consuming, especially for oblique incidence. In this paper, a fast full-matrix imaging algorithm in the Fourier domain is proposed to accelerate the TFM under the condition of oblique incidence. The algorithm adopts the Chebyshev polynomials of the second kind to directly expand the Fourier extrapolator with lateral sound velocity variation. The direct expansion maintains image accuracy and resolution in wide-angle situations, covering both small and large angles, making it highly suitable for weld inspection. Simulations prove that the third-order Chebyshev expansion is required to achieve image accuracy equivalent to the TFM with wide-angle incidence. Experiments verify the algorithm’s performance for weld flaws using the proposed method with the transverse wave and the full-skip mode. The depth deviation is within 0.53 mm, and the sizing error is below 15%. The imaging efficiency is improved by a factor of up to 8 compared to conventional TFM. We conclude that the proposed method is applicable to high-speed weld inspection with various oblique incidence angles.

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Section: Introductionmentioning

confidence: 99%

Full-Matrix Imaging in Fourier Domain towards Ultrasonic Inspection with Wide-Angle Oblique Incidence for Welded Structures

Chen,

Xu,

Yang

et al. 2024

Sensors

View full text Add to dashboard Cite

show abstract

“…The signal is stable and the signal-to-noise ratio of this probe is high. It can perform high-precision detection of samples in the form of single-probe scanning or multi-probe phased array, and is a reliable contact detection method [ 14 ]. Single-probe scanning can draw B-scan or C-scan images through A-scan signals.…”

Section: Introductionmentioning

confidence: 99%

Research on Photoacoustic Synthetic Aperture Focusing Technology Imaging Method of Internal Defects in Cylindrical Components

Zhang,

Li,

Chen

et al. 2023

Sensors

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Cylindrical components are parts with curved surfaces, and their high-precision defect testing is of great significance to industrial production. This paper proposes a noncontact internal defect imaging method for cylindrical components, and an automatic photoacoustic testing platform is built. A synthetic aperture focusing technology in the polar coordinate system based on laser ultrasonic (LU-pSAFT) is established, and the relationship between the imaging quality and position of discrete points is analyzed. In order to verify the validity of this method, small holes of Φ0.5 mm in the aluminum alloy rod are tested. During the imaging process, since a variety of waveforms can be excited by the pulsed laser synchronously, the masked longitudinal waves reflected by small holes need to be filtered and windowed to achieve high-quality imaging. In addition, the influence of ultrasonic beam angle and signal array spacing on imaging quality is analyzed. The results show that the method can accurately present the outline of the small hole, the circumferential resolution of the small hole is less than 1° and the dimensional accuracy and position error are less than 0.1 mm.

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Research on unbonded defect imaging method of corrugated clad plate based on laser ultrasonics

Li,

Zhang,

Liu

et al. 2025

Measurement

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Extended Non-Stationary Phase-Shift Migration for Ultrasonic Imaging of Irregular Surface Component

Cited by 8 publications

References 31 publications

Full-Matrix Imaging in Fourier Domain towards Ultrasonic Inspection with Wide-Angle Oblique Incidence for Welded Structures

Full-Matrix Imaging in Fourier Domain towards Ultrasonic Inspection with Wide-Angle Oblique Incidence for Welded Structures

Research on Photoacoustic Synthetic Aperture Focusing Technology Imaging Method of Internal Defects in Cylindrical Components

Research on unbonded defect imaging method of corrugated clad plate based on laser ultrasonics

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