A time-of-flight mapping method for laser ultrasound guided in a pipe and its application to wall thinning visualization

Lee, Jung-Ryul; Chong, See Yenn; Jeong, Hyomi; Kong, Churl-Won

doi:10.1016/j.ndteint.2011.07.005

Cited by 43 publications

(26 citation statements)

References 27 publications

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“…In fact, each wave can be incident on the path toward the notch, and its reflection can be detected. As mentioned in Section 4, the RC can be obtained in the frequency domain [51,56,57,128,153,154,155,156,157] or in the time domain [24,51,57,128,153,154,156,157] by dividing the signal amplitude, which is reflected from the notch, by the reference amplitude signal, which is reflected from the pipe end before introducing the notch. Moreover, the RC can be measured in the time or frequency domain by taking the maximum peak-to-peak amplitude [26].…”

Section: Gw Simulationmentioning

confidence: 99%

Detection, Localisation and Assessment of Defects in Pipes Using Guided Wave Techniques: A Review

Ghavamian

Mustapha

Baharudin

et al. 2018

Sensors

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This paper aims to provide an overview of the experimental and simulation works focused on the detection, localisation and assessment of various defects in pipes by applying fast-screening guided ultrasonic wave techniques that have been used in the oil and gas industries over the past 20 years. Major emphasis is placed on limitations, capabilities, defect detection in coated buried pipes under pressure and corrosion monitoring using different commercial guided wave (GW) systems, approaches to simulation techniques such as the finite element method (FEM), wave mode selection, excitation and collection, GW attenuation, signal processing and different types of GW transducers. The effects of defect parameters on reflection coefficients are also discussed in terms of different simulation studies and experimental verifications.

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Section: Gw Simulationmentioning

confidence: 99%

Detection, Localisation and Assessment of Defects in Pipes Using Guided Wave Techniques: A Review

Ghavamian

Mustapha

Baharudin

et al. 2018

Sensors

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“…A gerjesztést követően a rezonanciafrekvenciák méréséből nyert információk használhatóak fel különböző célokra, mint például a dinamikus Young és a nyírási modulus meghatározására [4]. Szintén széles körben alkalmazott a repülési idő (time of flight, TOF) technika, amely alkalmazható például a csőfal elvékonyodásának megjelenítésére [5].…”

Section: Csövek Rezgésdiagnosztikai Vizsgálataunclassified

Csövek keresztmetszet-szűkülésének modellezése és rezgésdiagnosztikai vizsgálata

Kocsis¹,

Horvath²

2016

MTK

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In this work model experiments and vibration diagnostic tests were performed on stainless steel and PVC pipes. Reduction in inner diameter of pipes, as a characteristic failure (for example limescale deposition) was modeled in the introduced test series. To this end, the different phases of deposition are artificially simulated in the model experiments. Characterization of the degradation of the pipes was performed by vibration based measurements.

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“…Therefore, the laser ultrasonic technique is suitable for inspecting a wide area in a single measurement. The pulsed laser technique [3][4][5][6] is widely adopted for nondestructive evaluation (NDE), but two critical issues have to be solved. First, several repeated scans are necessary, which require scanning time; therefore, the scanning time is difficult to reduce.…”

Section: Introductionmentioning

confidence: 99%

Measurement of defects in a plate using dry-coupled interdigital transducer–based scanning laser Doppler vibrometer

Ting

Han

Moon

et al. 2020

Structural Health Monitoring

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The interdigital transducer–based scanning laser Doppler vibrometer has recently been introduced to efficiently generate the symmetric mode for damage detection of shallow defects in thick plates. To measure shallow defects in a carbon steel plate, the excitation frequency is optimized based on the analysis of wavenumber sensitivity and degree of separation between modes. Even though the interdigital transducer–based scanning laser Doppler vibrometer method using continuous excitation is a promising method for visualizing defects in plate-like structures, the interdigital transducer has to be coupled to media, such as oil or water, to minimize the variation in acoustic impedance between the lead zirconium titanate and the plate-like structures. In this study, we develop a dry-coupled interdigital transducer–based scanning laser Doppler vibrometer system for the detection of shallow defects in a plate to facilitate easy mounting and demounting from the plate. To verify the proposed dry-coupled interdigital transducer–based scanning laser Doppler vibrometer, plates with four and eight different depth defects are introduced, and it is demonstrated that the defects in thick plates measured by dry-coupled interdigital transducer–based scanning laser Doppler vibrometer are visualized compared to those measured by interdigital transducer–based scanning laser Doppler vibrometer.

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A time-of-flight mapping method for laser ultrasound guided in a pipe and its application to wall thinning visualization

Cited by 43 publications

References 27 publications

Detection, Localisation and Assessment of Defects in Pipes Using Guided Wave Techniques: A Review

Detection, Localisation and Assessment of Defects in Pipes Using Guided Wave Techniques: A Review

Csövek keresztmetszet-szűkülésének modellezése és rezgésdiagnosztikai vizsgálata

Measurement of defects in a plate using dry-coupled interdigital transducer–based scanning laser Doppler vibrometer

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