Reconstructing the Back of a Defect From Its Mirror Image

Hutt, T.; Simonetti, F.; Thompson, Donald O.; Chimenti, Dale E.

doi:10.1063/1.3362469

Cited by 3 publications

(2 citation statements)

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“…One problem of this method is that by ignoring the the small singular values, it leads to a loss of information. In the case of limited-view imaging, a common way to compensate for the loss of information is to increase the available aperture (Hutt and Simonetti, 2010b).…”

Section: E Truncation Methods For Fmmentioning

confidence: 99%

Eliminating backwall effects in the phased array imaging of near backwall defects

Zhang

Huthwaite

Lowe

2018

The Journal of the Acoustical Society of America

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Ultrasonic array imaging is widely used to provide high quality defect detection and characterization. However, the current imaging techniques are poor at detecting and characterizing defects near a surface facing the array, as the signal scattered from the defect and the strong reflection from the planar backwall will overlap in both time and frequency domains, masking the presence of the defect. To address this problem, this paper explores imaging algorithms and relevant methods to eliminate the strong artefacts caused by the backwall reflection. The half-skip total focusing method (HSTFM), the factorization method (FM) and the time domain sampling method (TDSM) are chosen as the imaging algorithms used in this paper. Then, three methods, referred to as full matrix capture (FMC) subtraction, weighting function filtering, and the truncation method, are developed to eliminate or filter the effects caused by the strong backwall reflection. These methods can be applied easily with few tuning parameters or little prior knowledge. The performances of the proposed imaging techniques are validated in both simulation and experiments, and the results show the effectiveness of the developed methods to eliminate the artefacts caused by the backwall reflections when imaging near backwall defects.

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Section: E Truncation Methods For Fmmentioning

confidence: 99%

Eliminating backwall effects in the phased array imaging of near backwall defects

Zhang

Huthwaite

Lowe

2018

The Journal of the Acoustical Society of America

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“…By considering the directionality we can reduce the magnitude of the artifacts in the shear wave images, and improve the accuracy of the true image. The method used was detailed in [8]; we alter the directionality of the Green's function in equations 4 and 6 to match that of the transducers. The effect on imaging is shown in figure 5, where a 1.5 mm vertical crack is imaged with and without consideration of the directionality.…”

Section: Directionalitymentioning

confidence: 99%

Super-Resolution Imaging in Elastic Media

Hutt

Simonetti

Thompson³

et al. 2011

AIP Conference Proceedings

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Ultrasonic imaging of defects in elastic media is complicated by the generation and detection of shear waves. We investigate whether these affect imaging using two imaging algorithms and whether time-domain gating can be used to improve the results. It was found that the additional presence of the shear waves does not degrade the resulting image compared to the gated version when using the Factorisation Method, which also allows imaging at super-resolution (sub-1 2 λ ) scales.

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