Dynamic focusing through arbitrary geometry interfaces

Parrilla, M.; Brizuela, José; Camacho, J.; Ibanez, A.; Nevado, P.; Fritsch, C.

doi:10.1109/ultsym.2008.0288

Cited by 16 publications

(5 citation statements)

References 5 publications

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“…These are the fixed planar delay-line/tire interface inside the PAUT probe and the nonplanar tire/WAAM arbitrary contour interface on the as-built WAAM surface. The delay calculations were carried out according to the minimum ToF principle, which is also known as Fermat's principle [56]. In the case of homogeneous media, a straight line connecting an element and an image pixel best describes the path along which an ultrasonic wave generated by the element traverses to reach a specific image pixel.…”

Section: Focusing Through Multiple Mediamentioning

confidence: 99%

Multi-layer ultrasonic imaging of as-built Wire + Arc Additive Manufactured components

Zimermann

Mohseni

Lines

et al. 2021

Additive Manufacturing

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Section: Focusing Through Multiple Mediamentioning

confidence: 99%

Multi-layer ultrasonic imaging of as-built Wire + Arc Additive Manufactured components

Zimermann

Mohseni

Lines

et al. 2021

Additive Manufacturing

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“…The number of ToF calculations is significantly reduced in this case and an approximate solution of suitable accuracy can be obtained through an interpolating polynomial. These calculations are particularly suited to GP-GPU processors [4][5][6] and the detail of the procedure will be published in depth in a future journal paper.…”

Section: Background Of Cuemapmentioning

confidence: 99%

Inspection design using 2D phased array, TFM and cueMAP software

McGilp

Dziewierz

Lardner

et al. 2014

AIP Conference Proceedings

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A simulation suite, cueMAP, has been developed to facilitate the design of inspection processes and sparse 2D array configurations. At the core of cueMAP is a Total Focusing Method (TFM) imaging algorithm that enables computer assisted design of ultrasonic inspection scenarios, including the design of bespoke array configurations to match the inspection criteria. This in-house developed TFM code allows for interactive evaluation of image quality indicators of ultrasonic imaging performance when utilizing a 2D phased array working in FMC/TFM mode. The cueMAP software uses a series of TFM images to build a map of resolution, contrast and sensitivity of imaging performance of a simulated reflector, swept across the inspection volume. The software takes into account probe properties, wedge or water standoff, and effects of specimen curvature. In the validation process of this new software package, two 2D arrays have been evaluated on 304n stainless steel samples, typical of the primary circuit in nuclear plants. Thick section samples have been inspected using a 1MHz 2D matrix array. Due to the processing efficiency of the software, the data collected from these array configurations has been used to investigate the influence sub-aperture operation on inspection performance.

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“…Ultrasonic Non-Destructive Evaluation (NDE) using Full Matrix Capture (FMC) and Total Focusing Method (TFM) is used for high resolution imaging because every pixel is in optimal focus [4]. A further benefit when used for in-process AM inspection is that the beamforming is implemented as a post-processing operation [5], which allows adaptive compensation (ATFM) for unknown and irregular interfaces [6,7,8], addressing the remaining challenge.…”

Section: Introductionmentioning

confidence: 99%

Using Coded Excitation to maintain Signal to Noise for FMC+TFM on Attenuating Materials

Lines

Mohseni

Javadi

et al. 2019

2019 IEEE International Ultrasonics Symposium (IUS)

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Ultrasonic Non-Destructive Evaluation using Full Matrix Capture (FMC) and Total Focusing Method (TFM) is used for high resolution imaging as every pixel is in optimal focus. FMC excites one element in turn, so operates with lower transmitted energy compared to phased array beamforming. The energy at a reflector is further reduced by the broad directivity pattern of the single element. The large number of Tx/Rx A-scans that contribute to each pixel recover the Signal-to-Noise Ratio (SNR) in the final TFM image. Maintaining this in the presence of attenuating materials is a challenge because relevant information in each Ascan signal is buried in the thermal noise, and the TFM process assumes no quantization effects in the Analogue-to-Digital Converters (ADCs) in each receiver. In-process inspection during Additive Manufacturing (AM) requires ultrasonic array sensors that can tolerate high temperatures, scan over rough surfaces and leave no residue. Dry-coupled wheel probes are a solution, but the tire rubbers are often highly attenuating, causing a problem for FMC+TFM needed to adapt the focus through the rough surface. Common approaches to maintain the SNR are to drop the frequency or to average over multiple transmissions, but these compromise resolution and acquisition rate respectively. In this paper, the application of coded excitation to maintain the SNR in the presence of high signal attenuation is explored.

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Dynamic focusing through arbitrary geometry interfaces

Cited by 16 publications

References 5 publications

Multi-layer ultrasonic imaging of as-built Wire + Arc Additive Manufactured components

Multi-layer ultrasonic imaging of as-built Wire + Arc Additive Manufactured components

Inspection design using 2D phased array, TFM and cueMAP software

Using Coded Excitation to maintain Signal to Noise for FMC+TFM on Attenuating Materials

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