Combination of direct, half-skip and full-skip TFM to characterize defect(II)

Han, Xiaoli; Wu, Wentao; Zhang, Di; Wan, Haitao

doi:10.1109/ultsym.2019.8925989

Cited by 3 publications

(8 citation statements)

References 9 publications

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“…Multi-view imaging is also explored as it has recently proven to be an interesting technique for defect characterization [ 10 , 12 , 25 ]. A view is constituted of two ray paths: a transmitting path from the probe to the defect, and a receiving path from the defect to the probe.…”

Section: Methodsmentioning

confidence: 99%

Towards an Alternative to Time of Flight Diffraction Using Instantaneous Phase Coherence Imaging for Characterization of Crack-Like Defects

Gauthier

Painchaud-April²,

Duff³

et al. 2021

Sensors

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Time of flight diffraction (TOFD) is considered a reliable non-destructive testing method for the inspection of welds using a pair of single-element probes. On the other hand, ultrasonic phased array imaging has been continuously developed over the last couple of decades, and now features powerful algorithms, such as the total focusing method (TFM) and its multi-view approach to rendering detailed images of inspected parts. This article focuses on a different implementation of the TFM algorithm, relying on the coherent summation of the instantaneous signal phase. This approach presents a wide range of benefits, such as removing the need for calibration, and is highly sensitive to defect tips. This study compares the sizing and localization capabilities of the proposed method with the well-known TOFD. Both instantaneous phase algorithm and TOFD do not take advantage of the signal amplitude. Experimental tests were performed on a ¾″-thick steel sample with crack-like defects at different angles. Phase-based imaging techniques showed similar characterization capabilities as the standard TOFD method. However, the proposed method adds the benefit of generating an easy-to-interpret image that can help in localizing the defect. These results pave the way for a new characterization approach, especially in the field of automated ultrasonic testing (AUT).

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Section: Methodsmentioning

confidence: 99%

Towards an Alternative to Time of Flight Diffraction Using Instantaneous Phase Coherence Imaging for Characterization of Crack-Like Defects

Gauthier

Painchaud-April²,

Duff³

et al. 2021

Sensors

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“…Por esses motivos, esta técnica é consagrada na literatura. Consequentemente, surgiram várias técnicas de processamento de imagens com o objetivo de melhorar a qualidade das imagens TFM [5,6,7,8,9,10,11,12,13,14]. Dentre essas, destacam-se as técnicas mencionadas nos parágrafos a seguir.…”

Section: Lista De Figurasunclassified

“…A fim de melhorar a reconstrução dos defeitos nas imagens TFM, Han et al [6,7] propôs a geração de uma imagem TFM final a partir do somatório de três imagens TFM que foram reconstruídas usando a mesma aquisição FMC. Cada imagem é gerada através do emprego de três configurações diferentes de reconstrução.…”

Section: Lista De Abreviaturasunclassified

“…Na literatura, alguns trabalhos investigam a combinação desses três modos de reconstrução para melhorar a caracterização dos defeitos e a qualidade da imagem [6,7].…”

Section: P Punclassified

“…A matriz de transferência K(ω) definida na Seção 2.2.5.1 permite expressar os sinais recebidos em função dos sinais emitidos segundo a relação definida na Equação (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17). Assim, considerando e 0 (ω) como o vetor de entrada na primeira iteração, o vetor de sinais recebidos é dado por r 0 (ω) = K(ω)e 0 (ω).…”

Section: Iteração Do Processo De Reversão Temporalunclassified

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Reconstrução De Imagens De Ultrassom Pelo Método De Focalização Total: Técnicas Para Melhoria Da Relação Sinal Ruído

SOUZA¹

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Improvement of Ultrasonic Image by a Combination of Correlation-based Image Processing and Virtual Sources Applied to Non-destructive Evaluation

Souza

Freitas

Kubrusly

et al. 2020

2020 International Conference on Systems, Signals and Image Processing (IWSSIP)

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Combination of direct, half-skip and full-skip TFM to characterize defect(II)

Cited by 3 publications

References 9 publications

Towards an Alternative to Time of Flight Diffraction Using Instantaneous Phase Coherence Imaging for Characterization of Crack-Like Defects

Towards an Alternative to Time of Flight Diffraction Using Instantaneous Phase Coherence Imaging for Characterization of Crack-Like Defects

Reconstrução De Imagens De Ultrassom Pelo Método De Focalização Total: Técnicas Para Melhoria Da Relação Sinal Ruído

Improvement of Ultrasonic Image by a Combination of Correlation-based Image Processing and Virtual Sources Applied to Non-destructive Evaluation

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