Optimization of guided wave array for inspection of large plate structures

Velichko, Alexander

doi:10.1063/1.4940477

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…linear array in MUSIC, cross-hole array in tomography) and transducer number are important factors in these methods. In practice, many researchers have paid attention to optimization design of transducer array to improve the performance of wave source localization, including the improvement of localization accuracy and the suppression of imaging artifacts [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Localization of Lamb wave source with a single transmitter-receiver combination by elastic metamaterials

Hua¹,

Lian²,

Du³

et al. 2022

Smart Mater. Struct.

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Many nondestructive testing (NDT) and structural health monitoring (SHM) systems utilize Lamb wave transducer arrays for identification and localization of scattering wave sources. A large number of transducers are usually required during array signal processing and source localization, which increases hardware cost and reduces system reliability. To overcome this limitation, a metamaterial structure is designed in this study to realize source localization with a single transmitter-receiver combination. The basic design principle is the utilization of local resonators to customize propagation characteristics of Lamb waves. In particular, amplitude-frequency modulation and velocity dispersion are customized during metamaterial design. Uncorrelated amplitude-frequency modulation is extracted from signal frequency spectrum for orientation identification. Velocity dispersion is extracted from signal time-frequency spectrum for distance evaluation. After orientation

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Section: Introductionmentioning

confidence: 99%

Localization of Lamb wave source with a single transmitter-receiver combination by elastic metamaterials

Hua¹,

Lian²,

Du³

et al. 2022

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

Design optimization of transducer arrays for uniform distribution of guided wave energy in arbitrarily shaped domains

2020

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Ultrasonic Wave-Speed Diffraction Tomography With Undersampled Data Using Virtual Transducers

Shi

Huthwaite

2018

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Ultrasonic diffraction tomography offers a way to achieve high-resolution imaging of the wave-speed map, and hence, has strong potential applications in medical diagnosis and nondestructive evaluation. Ideal images can be obtained with a complete array of sensors surrounding the scatterer, provided that the measurement data are fully sampled in space, obeying the Nyquist criterion. Spatial undersampling causes the image to be distorted and introduce unwanted circular artifacts. In this paper, we propose an iteration approach using virtual transducers to achieve high-resolution tomographic imaging with undersampled measurements. At each iteration stage, the extent constraint estimated from the shape of the object of interest is applied on the image space to obtain a regularized image, based on which the ultrasonic measurement data at virtual transducers are calculated using a forward model. The full data set composed of original and virtual measurements is then used for tomography in the next stage. A final image with sufficiently high resolution is obtained only after a few iterations. The new imaging method yields improvements in the robustness and accuracy of ultrasonic tomography with undersampled data. We present numerical results using complicated wave-speed maps from realistic corrosion profiles. In addition, an experiment using guided ultrasonic waves is performed to further evaluate the imaging method.

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Optimization of guided wave array for inspection of large plate structures

Cited by 3 publications

References 8 publications

Localization of Lamb wave source with a single transmitter-receiver combination by elastic metamaterials

Localization of Lamb wave source with a single transmitter-receiver combination by elastic metamaterials

Design optimization of transducer arrays for uniform distribution of guided wave energy in arbitrarily shaped domains

Ultrasonic Wave-Speed Diffraction Tomography With Undersampled Data Using Virtual Transducers

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