Lamb Wave Contact Scanning Tomography

McKeon, James C. P.; Hinders, Mark K.

doi:10.1007/978-1-4615-4791-4_122

Cited by 12 publications

(6 citation statements)

References 7 publications

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“…In this case, the inhomogeneous plate can be characterized by a single spatially dependent wavespeed c(r). Previous imaging studies employing time-of-flight ultrasonic tomography [11], [13], [14] confirm that the single wavespeed model can be appropriate for propagation of Lamb waves in flawed plates. This wavespeed is directly related to parameters such as the local density, thickness, and elastic constants of the plate [33].…”

Section: Theorymentioning

confidence: 87%

“…A more general approach to nondestructive testing using Lamb waves is Lamb wave tomography [11]- [14] in which two-dimensional Lamb wave speed attenuation maps are quantitatively reconstructed from multiple pitchcatch measurements. This technique has been used to successfully image flaws but possesses weaknesses characteristic of its algorithm.…”

Section: Introductionmentioning

confidence: 99%

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Quantitative flaw reconstruction from ultrasonic surface wavefields measured by electronic speckle pattern interferometry

Mast

Gordon

2001

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

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A new method for imaging flaws in plate and shell structures is presented. The method employs twodimensional ultrasonic surface wave data obtained by optical electronic speckle pattern interferometry (ESPI) techniques. In the imaging method, the measured out-of-plane displacement field associated with an externally excited ultrasonic Lamb wave is processed to obtain the spatial frequency domain spectrum of the wavefield. A free space Green's function is then deconvolved from the wavefield to obtain quantitative images of effective scattering sources. Because the strength of these effective sources is directly dependent on local variations in sample thickness and material properties, these images provide a direct map of internal inhomogeneities. Simulation results show that the method accurately images flaws for a wide range of sizes and material contrast ratios. These results also demonstrate that flaw features much smaller than an acoustic wavelength can be imaged, consistent with the theoretical capability of the imaging method to employ scattered evanescent waves. Reconstructions are also obtained from ultrasonic Lamb wave displacement fields recorded by ESPI in a flawed aluminum plate. These reconstructions indicate that the present method has potential for imaging flaws in complex structures for which ESPI wavefield measurements cannot be straightforwardly interpreted.

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Section: Theorymentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Quantitative flaw reconstruction from ultrasonic surface wavefields measured by electronic speckle pattern interferometry

Mast

Gordon

2001

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

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“…Combining filtered back-projection tomography with laser ultrasound, Nagata et al used line-focused pulse laser to generate lamb waves and took the propagation attenuation of guided waves in the defect area as the imaging parameter to get tomographic imaging of through-holes defects in thin aluminum plates [17]. Hinders et al demonstrated that cross projection is an adaptable method for guided wave tomography and used for scanning structures of any geometric shape [18] and a multi-mode ultrasonic guided wave tomography method was also proposed to identify different types of damage in an aluminum plate [19]. With the combination of cross-hole tomography and ultrasonic guided wave technology, Leonard et al realized the ultrasonic guided wave tomography detection for pipeline defects [20] and then used ultrasonic signals that travel with various helical paths to achieve tomographic reconstruction for pipes [21].…”

Section: Introductionmentioning

confidence: 99%

Elbow Damage Identification Technique Based on Sparse Inversion Image Reconstruction

Wang

2020

Materials

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Continuous monitoring for defects in oil and gas pipelines is important for leakage prevention. This paper proposes a new kind of pipe elbow damage identification technique, which consists of three processes. First, piezoelectric sensors evenly arranged along the circumference of the pipeline in the turn generated ultrasonic guided wave signals in the elbow. Then, the wavefront flight time at each grid node in the known sound field were computed using the fast-marching algorithm. Finally, an elbow wall thickness map reconstruction technique based on the sparse inversion method was proposed to identify elbow defects. Compared with the traditional elbow defect identification technology, this technology can not only detect the existence of the defect but also accurately locate the defect position.

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“…Since they propagate relatively long distances within pipe, plate and shell structures, guided waves allow inspection of greater areas with fewer sensors, making this technique attractive for a variety of applications [6,7]. This paper builds on a previous line of research we've developed over the past decade [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] Here, we will point out some of the major breakthroughs over the decades as well as recent advancements in the specific areas discussed in this work.…”

Section: Introductionmentioning

confidence: 99%

Lamb Wave Detection of Delaminations in Large Diameter Pipe Coatings

Bingham¹,

Hinders²

2009

TOACOJ

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This paper describes combined experiments and simulations to automate the extraction of ultrasonic guided wave mode arrivals in order to gain quantitative information about large-diameter pipeline coatings. The dynamic wavelet fingerprint technique (DWFT) is used to show differences between unknown coatings as well as to identify the presence of delamination and grinding flaws within the Lamb wave propagation path. Combined with complex multi-layered models to help interpret the guided wave feature changes, this extraction algorithm can be used for the detection of hidden flaws under a variety of protective coatings without having to disturb the coating or pipeline flow. High-resolution supercomputer simulations are developed using the elastodynamic finite integration technique (EFIT) accounting for the 3D interaction of realistic Lamb wave beams with finite-sized coating delaminations.

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Lamb Wave Contact Scanning Tomography

Cited by 12 publications

References 7 publications

Quantitative flaw reconstruction from ultrasonic surface wavefields measured by electronic speckle pattern interferometry

Quantitative flaw reconstruction from ultrasonic surface wavefields measured by electronic speckle pattern interferometry

Elbow Damage Identification Technique Based on Sparse Inversion Image Reconstruction

Lamb Wave Detection of Delaminations in Large Diameter Pipe Coatings

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