Characterisation of small embedded two-dimensional defects using multi-view Total Focusing Method imaging algorithm

Budyn, Nicolas; Croxford, Anthony J.; Bevan, Rhodri L. T.; Zhang, Jie; Wilcox, Paul D.

doi:10.1016/j.ndteint.2021.102413

Cited by 14 publications

(6 citation statements)

References 29 publications

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“…On the other hand, the use of the different modes has been extensively examined in PA imaging with piezoelectric array transducers. 13,[43][44][45][61][62][63][64] For example, multi-mode PLUS can utilize the shear-wave incidence. By making a wedge with an angle between the first and second critical angles for the piezoelectric transmitter, only the shear wave incidence can be performed.…”

Section: Discussionmentioning

confidence: 99%

“…Importantly, the scattering phenomena can accompany the mode conversion of the ultrasonic wave. 34,[42][43][44][45] When an incident wave is a longitudinal mode, the scattered waves contain not only a longitudinal mode but also a mode-converted shear mode. An LDV receives the longitudinal and modeconverted shear scattered waves at a point on the top surface.…”

Section: Multi-mode Plusmentioning

confidence: 99%

“…[39][40][41] However, the ultrasonic mode used has been limited to a single mode. That is, the mode conversion 34,[42][43][44][45] due to ultrasonic scattering at defects has yet to be considered. Importantly, the utilization of such mode-converted scattered waves may provide further information on defects and can enhance the robustness of 3D imaging capability of PLUS.…”

Section: Introductionmentioning

confidence: 99%

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Multi-mode 3D ultrasonic phased array imaging method using piezoelectric and laser ultrasonic system (PLUS)

Ohara¹,

Ulrich²,

Remillieux³

et al. 2023

Jpn. J. Appl. Phys.

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As a high-resolution 3D phased-array imaging method, a piezoelectric and laser ultrasonic system (PLUS) was proposed, which is a combination of a piezoelectric transmitter and an ultra-multiple scan of a laser Doppler vibrometer. Thus far, PLUS has used an identical mode for incident and scattered waves. On the other hand, the ultrasonic scattering phenomena can accompany the mode conversion, which may provide further information on defects. In this paper, we propose multi-mode PLUS to enhance its imaging capability and attain more robustness. After describing the principle of multi-mode PLUS, we validated the imaging algorithm and demonstrated the improvement in the image resolution using a dataset of simulated received waves for the longitudinal-wave incidence to scatterers. Furthermore, we experimentally demonstrated the efficacy of multi-mode PLUS in a specimen with branched stress corrosion cracking.

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Section: Discussionmentioning

confidence: 99%

Section: Multi-mode Plusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multi-mode 3D ultrasonic phased array imaging method using piezoelectric and laser ultrasonic system (PLUS)

Ohara¹,

Ulrich²,

Remillieux³

et al. 2023

Jpn. J. Appl. Phys.

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“…The delay-and-sum (DAS) beamforming is the most common method for TFM image reconstruction. DAS has the character of easy expansion and good secondary development because it can reconstruct the individual amplitude imaging slice of each emit-receiving channel signal in the region of interest [8,9]. For example, some adaptive weighting factors for improving the TFM imaging quality, such as coherence factor (CF), sign coherence factor (SCF), and vector coherence factor (VCF) [10][11][12][13], are proposed when the individual amplitude imaging slices are considered the statistical sample.…”

Section: Introductionmentioning

confidence: 99%

Fourier-domain beamforming for Full Matrix Capture Data with Circular Statistics Vector Weighting in Nondestructive Testing

Yao

Xiong

et al. 2023

Preprint

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Total focusing method (TFM) based on full-matrix capture (FMC) is widely used in the field of nondestructive testing due to its high resolution and high signal-to-noise ratio. In order to solve the problems of the slow speed of traditional time-domain total focusing imaging and poor imaging quality, this paper proposes a total focusing imaging method weighted by circular statistics vector (CSV) in the Fourier domain (FD). Firstly, the cosine and sinusoidal components of the instantaneous phase in the undelayed RF signal are extracted, and the coherence factor is established according to the cosine and sinusoidal components in the FD domain. Finally, the total focusing image in the FD domain is weighted. The complexity calculation shows that CSV-weighted imaging in the FD domain has a higher imaging speed than delay-and-sum (DAS) imaging. The DAS total focusing imaging algorithm, FD domain total focusing imaging algorithm, and FD domain CSV weighted imaging algorithm are used to verify the hole and crack defects in brass test blocks, aluminum test blocks, and steel test blocks. The experimental results show that the proposed FD domain CSV weighted imaging map generally shows higher resolution and signal-to-noise ratio, and the algorithm has higher robustness. Also, it has revealed a low computational load.

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“…Ultrasonic arrays have been increasingly used for non-destructive evaluation (NDE) in recent years [1]. The adoption of the Full Matrix Capture (FMC) array data acquisition technique [2] resulted in the development of many post-processing algorithms [3][4][5][6][7][8][9], which provided improved array image quality and more accurate defect characterization [10][11][12][13][14][15][16]. Mathematical models of array data serve as a basis for developing and optimizing array image and defect characterization.…”

Section: Introductionmentioning

confidence: 99%

Efficient model of wave scattering from large defects in ultrasonic array inspections

Zhang

Velichko

2022

NDT & E International

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Characterisation of small embedded two-dimensional defects using multi-view Total Focusing Method imaging algorithm

Cited by 14 publications

References 29 publications

Multi-mode 3D ultrasonic phased array imaging method using piezoelectric and laser ultrasonic system (PLUS)

Multi-mode 3D ultrasonic phased array imaging method using piezoelectric and laser ultrasonic system (PLUS)

Fourier-domain beamforming for Full Matrix Capture Data with Circular Statistics Vector Weighting in Nondestructive Testing

Efficient model of wave scattering from large defects in ultrasonic array inspections

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