Control of complex components with Smart Flexible Phased Arrays

Casula, O.; Poidevin, C.; Cattiaux, G.; Dumas, Ph.

doi:10.1016/j.ultras.2006.05.122

Cited by 32 publications

(33 citation statements)

References 1 publication

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“…In order to make the imaging possible for defects detected through a multiplicity of possible wave paths (involving tip diffraction, reflection, corner echoes, mode conversion,…) the FTP algorithm has been generalized to multimodal echographies following an approach similar to the one described in [8]. We define here one "mode" by the characteristics of the corresponding wave path: the succession of interactions with the defect or the surface and the polarization of the wave before between and after these interactions.…”

Section: Generalization Of the Algorithmmentioning

confidence: 99%

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Imaging of Defects in Several Complex Configurations by Simulation-Helped Processing of Ultrasonic Array Data

Fidahoussen¹,

Calmon²,

Lambert³

et al. 2010

AIP Conference Proceedings

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Advanced ultrasonic array techniques such as full matrix acquisitions provide considerable amount of data making possible by the use of suitable processing algorithms enhanced capability of defects imaging and therefore improved localization and sizing. In general the applied processing consists in a coherent summation of signals (synthetic focusing) based on a time of flight inverse matching. Such algorithms have been connected to forwards models allowing to image defects in realistically complex configurations. In this communication we present results obtained on defects detected through complex surfaces on defects detected by multiple ultrasonic paths (tip diffraction, corner effect, mode conversions). The performances of the technique are evaluated both on simulated and experimental results.

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Section: Generalization Of the Algorithmmentioning

confidence: 99%

“…A flexible contact array, 24 elements, 2.25 MHz has been used on this block to generate FMC data from different positions. This technology developed at CEA LIST has been described elsewhere (see for example [8]). Fig.…”

Section: Imaging Notches In a Complex Partmentioning

confidence: 99%

Imaging of Defects in Several Complex Configurations by Simulation-Helped Processing of Ultrasonic Array Data

Fidahoussen¹,

Calmon²,

Lambert³

et al. 2010

AIP Conference Proceedings

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“…Ultrasonic data can be collected and displayed in a number of different formats. Previous work has highlighted the importance of introducing new data visualisation and analysis tools capable of mapping complex geometries and enabling easy detection of defects [12,[28][29][30][31] .…”

Section: The Need To Increase Speed and Improve Part Inspectabilitymentioning

confidence: 99%

Correction of B-scan distortion for optimum ultrasonic imaging of backwalls with complex geometries

Davi¹,

Mineo²,

MacLeod³

et al. 2020

insight

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Ultrasound undergoes refraction and reflection at interfaces between media of different acoustic refractive indices. The most common ultrasonic method (pulse-echo) monitors the reflected energy to infer the presence of flaws, whereas the lower amplitude of refracted signals is ignored. When the reflector is orientated normally with respect to the ultrasonic beam, the received echo signal shows the maximum amplitude. The pulse-echo method also relies on monitoring the amplitude of the backwall echo to identify or confirm the presence of defects. This works well for parts with constant thickness and with planar backwalls. Unfortunately, parts with complex backwalls are common to many industrial sectors. For example, applications such as aerospace structures often require parts with complex shapes. Assessing such parts reliably is not trivial and can cause severe downtime in the aerospace manufacturing processes or during in-service inspections. This work aims to improve the ultrasonic inspectability of parts with complex backwalls, through sending ultrasonic beams from the frontwall side. Ultrasonic phased array probes and state-of-the-art instrumentation allow ultrasonic energy to be sent into a part at wide ranges of focusing depths and steering angles. This allows for tracking of the backwall profile, thus hitting it normally and maximising the amplitude of the reflected echo at any point. However, this work has shown that a cross-sectional scan resulting from multiple ultrasonic beams, which are sent at variable incidence angles, can present significant geometrical distortion and cannot be of much use for accurate defect visualisation and sizing. This paper introduces a generalised algorithm developed to remove geometric distortions and the effect that variable refraction coefficients have on the transmitted and received amplitudes. The algorithm was validated through CIVA simulations for two example parts with complex backwalls, considering isotropic materials.

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“…However, it seems that a particular type of defect in certain parts of the nozzle can still remain undetectable due to the complex geometry of the nozzle [1][2][3] . The specific geometry of the nozzle, arising from the connection of two cylindrical bodies, complicates the positioning of the transducer and it is difficult to achieve the necessary orientation of the ultrasonic beam in order to inspect the required area of the nozzle [4][5][6][7] . In general, there are two zones important for the inspection -the nozzle-to-vessel weld and the inner surface (or inner radius) of the nozzle.…”

Section: Introductionmentioning

confidence: 99%

Investigation of ultrasonic inspection of the inner radius of a nozzle

Jasiūnienė¹,

Mažeika²,

Tumšys³

2013

Insight

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Various ultrasonic inspection techniques have been developed and are used for inspection of the nozzles of nuclear power plant vessels. However, it seems that radial/axial cracks in the inner part of the nozzles can still remain undetectable due to the complex geometry of the nozzle. The objective of this work was to determine the positions and orientations of the transducers and the incident angles needed to inspect the inner radius of a nozzle and to estimate which part of the inner radius can be inspected. The investigations were carried out using modelling with the CIVA software and by a model developed by us in Matlab. It is shown that most of the inner radius zone can be inspected using the proposed set of transducers. The positions of the transducers and the parameters suitable for the detection of defects in the inner radius zone were determined. It is necessary to underline that the wedges for the transducers should be different as different incident angles are required. The investigations demonstrated that a certain zone exists in the inner radius that cannot be inspected using a conventional pulse-echo technique.

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Control of complex components with Smart Flexible Phased Arrays

Cited by 32 publications

References 1 publication

Imaging of Defects in Several Complex Configurations by Simulation-Helped Processing of Ultrasonic Array Data

Imaging of Defects in Several Complex Configurations by Simulation-Helped Processing of Ultrasonic Array Data

Correction of B-scan distortion for optimum ultrasonic imaging of backwalls with complex geometries

Investigation of ultrasonic inspection of the inner radius of a nozzle

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