Improving the ultrasonic imaging of hydrogen-induced cracking using focused ultrasound

Hwang, Young-In; Kim, Hak-Joon; Song, Sung‐Jin; Lim, Zhong Soo; Yoo, Sung-Won

doi:10.1007/s12206-017-0724-x

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…Immersion-based ultrasonic inspection systems are widely utilized for many industrial applications such as on-line thickness gauging [14], automated scanning of complex geometry components, high-speed flaw detection in large dimension pipes/bars/tubes/plates etc. [14], depth or amplitudebased ultrasonic C-scan imaging, detection of hydrogen-induced cracking (HIC) in steel pipes in petrochemical industries [15], scanning of the side-drilled hole (SDH) and flat-bottom hole (FBH) inside ingot and many more. One of the major applications of this type of immersion-based ultrasonic imaging technique for the nuclear reactors is the core-mapping of liquid metal (Sodium)…”

Section: Related Workmentioning

confidence: 99%

Ultrasonic camera: a matrix-based real-time ultrasonic imaging system for immersion applications

et al. 2019

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The novel matrix-based real-time ultrasonic imaging using an ultrasonic camera for immersion application has been proposed in this paper. The proposed ultrasonic camera provides real-time images of mechanical components and the image size is equal to the field of view of the developed matrix-based transducer assembly. For the matrix-based ultrasonic imaging, the addressing-based analog multiplexing scheme has been proposed in such a way that all channels of the specific row are selected simultaneously such as the transducer excitation, data acquisition, data processing and transferring operations are performed concurrently. Similarly, the same operations are performed for remaining all rows sequentially. The developed ultrasonic camera further supports dynamic on-line reconfiguration of the analog front-end hardware, real-time hardware/software-based data processing and data transfer operation. For the experimentation, the entire matrix-based (5 × 5) ultrasonic imaging system for immersion applications has been designed, developed and evaluated in the laboratory. Here we present the performance evaluation of the developed matrix-based ultrasonic camera system by acquiring the real-time images of the water-immersed mechanical objects.

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Section: Related Workmentioning

confidence: 99%

Ultrasonic camera: a matrix-based real-time ultrasonic imaging system for immersion applications

et al. 2019

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“…Bae et al [20] non-destructively evaluated the damage and mechanical properties of hydrogen-filled stainless steel 304 using acoustic emission and ultrasound. Hwang et al [21] employed the synthetic aperture focusing technique (SAFT) to describe HIC images, with location and size information close to the actual defects, and determined the presence or absence of stepwise cracks using a technique for identification of flaw signals using deconvolution (TIFD). As shown in these previous studies, radiography, acoustic emission, and ultrasound have been used for the NDE of LHSVs.…”

Section: Introductionmentioning

confidence: 99%

Detection and Classification of Artificial Defects on Stainless Steel Plate for a Liquefied Hydrogen Storage Vessel Using Short-Time Fourier Transform of Ultrasonic Guided Waves and Linear Discriminant Analysis

Hwang¹,

Seo

Oh³

et al. 2022

Applied Sciences

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Liquefied hydrogen storage vessels (LHSVs) are vulnerable to surface-crack initiation, propagation, and fracture on their surfaces because they are under high-pressure, low-temperature conditions. Defects can also occur in the coatings of the storage containers used to prevent hydrogen permeation, and these lead to surface defects such as pitting corrosions. Together, these increase the probability of liquid hydrogen leaks and can cause serious accidents. Therefore, it is important to detect surface defects during periodic surface inspections of LHSVs. Among the candidate non-destructive evaluation (NDE) techniques, testing using guided waves (GWs) is effective for detecting surface defects. Because of the ability of GWs to travel long distances without significant acoustic attenuation, GW testing has attracted much attention as a promising structural monitoring technique for LHSVs. In this study, an ultrasonic NDE method was designed for detecting surface defects of 304SS plate, which is the main material used for fabricating LHSVs. It involves the use of linear discriminant analysis (LDA) based on short-time Fourier transform (STFT) pixel information produced from GW data. To accomplish this, the differences in the number of STFT pixels between sound and defective specimens were used as a major factor in distinguishing the two groups. Consequently, surface defects could be detected and classified with 97% accuracy by the newly developed pixel-based mapping method. This indicates that the newly developed NDE method with LDA can be used to detect defects and classify LHSVs as either sound or defective.

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“…In ultrasonic fullfocus detection, an array probe composed of multiple array elements emits multiple sound beams [6,7]. By controlling the delay or deflection of sound beams, the acoustic field generated by different array elements interferes, and the acoustic field is focused within the tube wall [8][9][10][11]. The use of ultrasonic full focus to detect internal pipeline corrosion exhibits several advantages compared with using other ultrasonic methods because it can concentrate the energy of the sound beam, increase internal pipeline corrosion detection accuracy, increase detection range by controlling the deflection angle and realize full coverage detection of a pipeline [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Analysis of acoustic field characteristics to detect internal pipeline corrosion based on ultrasonic full-focus

Du¹,

Wang²,

Mao³

2021

Meas. Sci. Technol.

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Seawater pipelines are an important part of ship structures. After a certain period of service, corrosion becomes a serious problem. Ultrasonic corrosion detection has good applicability in seawater pipeline corrosion detection. Aiming at the focusing problem of ultrasonic arrays in pipeline inspection, the sound pressure characteristics and acoustic field directivity in the propagation process were analyzed. A mathematical model of the acoustic field propagation characteristics was established, and the influence of deflection, focusing of the sound beam, and geometric characteristics of the array element on the characteristics of the ultrasonic acoustic field were analyzed through simulation calculations. An ultrasonic array focusing transducer was used to test the corrosion of a Φ168 pipeline. The results show that the number, size, and focal length of the working array significantly affect the focused acoustic field characteristics of the ultrasonic array. The ultrasonic full-focus method can effectively detect local corrosion of pipelines, and the defect detection accuracy has a nonlinear relationship with the number of working array elements and the focal length of the focus. Within a certain range, with an increase in the number of working elements, the overall tendency of the average error of defect detection gradually decreases. With the increase in focal length, the overall tendency of defect detection error first decreases and then increases, and there is a focal length range with the best detection accuracy. In pipeline inspection, the best working parameters can be selected according to the actual size of the pipeline.

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Improving the ultrasonic imaging of hydrogen-induced cracking using focused ultrasound

Cited by 5 publications

References 10 publications

Ultrasonic camera: a matrix-based real-time ultrasonic imaging system for immersion applications

Ultrasonic camera: a matrix-based real-time ultrasonic imaging system for immersion applications

Detection and Classification of Artificial Defects on Stainless Steel Plate for a Liquefied Hydrogen Storage Vessel Using Short-Time Fourier Transform of Ultrasonic Guided Waves and Linear Discriminant Analysis

Analysis of acoustic field characteristics to detect internal pipeline corrosion based on ultrasonic full-focus

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