Ultrasonic guided waves for monitoring corrosion in submerged plates

Sharma, Sandeep Kumar; Mukherjee, Abhijit

doi:10.1002/stc.1657

Cited by 53 publications

(32 citation statements)

References 26 publications

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“…This antisymmetric Lamb wave mode can be directly used in practical applications such as the estimation of the plate thickness [20], detection of defects in underwater pipes [5], identification of corrosion damage in submerged metallic structures [6], etc. Meanwhile, due to characteristics such as low attenuation, symmetric modes, especially those at a specific fd range, are frequently used in evaluations of solid plates, such as in hidden defect detection [21], multiple defect detection [22], corrosion monitoring [23], imaging of immersed plates with defects [24], and so on. These symmetric modes of Lamb waves at a specific fd range can also be generated and detected by contact-transducers.…”

Section: Introductionmentioning

confidence: 99%

Defects Detection and Localization in Underwater Plates Using Laser Laterally Generated Pure Non-Dispersive S0 Mode

Xie

Shen

2019

Applied Sciences

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Featured Application: This study provides a non-contact method of defect detection and localization in underwater plates using pure S 0 mode of Lamb wave with small dispersion generated by laterally distributed laser source.Abstract: When working in humid environments, corrosion defects are easily produced in metallic plates. For defect detection in underwater plates, symmetric modes of Lamb waves are widely used because of their characteristics including long propagating distance and high sensitivity to defects. In this study, we extend our previous work by applying the laser laterally generated S 0 mode to detection and localization of defects represented by artificial notches in an aluminum plate immersed in water. Pure non-dispersive S 0 mode is generated in an underwater plate by lateral laser source irradiation and its fd (frequency·thickness) range is selected by theoretical calculation. Using this lateral excitation, the S 0 mode is enhanced; meanwhile, the A 0 mode is effectively suppressed. The mode-converted A 0 mode from the incident S 0 mode is used to detect and localize the defect. The results reveal a significantly improved capability to detect defects in an underwater plate using the laser laterally generated S 0 mode, while that using A 0 is limited due to its high attenuation. Furthermore, owing to the long propagating distance and the non-dispersion characteristics of the S 0 generated by the lateral laser source, multiple defects can also be detected and localized according to the mode conversion at the defects.

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Section: Introductionmentioning

confidence: 99%

Defects Detection and Localization in Underwater Plates Using Laser Laterally Generated Pure Non-Dispersive S0 Mode

Xie

Shen

2019

Applied Sciences

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“…The potential benefits of such techniques are significant and include a step improvement in reliability and safety, along with a substantial reduction in the associated maintenance costs . The on‐line damage detection techniques are often based on the generation and sensing of guided waves to detect various types of structural damage, such as cracks , corrosion spots , delamination, debonding or matrix damage in composites .…”

Section: Introductionmentioning

confidence: 99%

A model‐based method for damage detection with guided waves

Aryan

Kotousov

et al. 2016

Struct. Control Health Monit.

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SUMMARYDefect detection techniques, which utilise guided waves, have received significant attention over the past twenty years. Many of these techniques implement the baseline signal subtraction approach for damage diagnosis. In this approach, the baseline signal previously recorded for a defect-free structure is compared with/or subtracted from the actual signal recorded during routine inspections. A significant deviation between these two signals (or residual signal/time-trace) can be treated as an indication of the presence of critical damage. However, the accuracy of this common approach can be compromised by various uncontrolled factors, which include ambient temperature variations, unavoidable inconsistencies in the PZT installation procedure and degradation of mechanical properties with time. This paper presents a new method for reconstruction of the baseline signal, which can compensate for the above influences and improve the accurateness of damage diagnosis. The method utilises 3D laser vibrometry measurements in conjunction with high-fidelity FE simulations. This paper also describes an application of this method to the reconstruction of the baseline signal and detection of damage in beam and plate structures.

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“…Rizzo et al [3] presented non-contact damage inspection for immersed structures using hybrid laser/immersion transducer system. Sharma and Mukherjee [4] proposed non-contact, in situ and nondestructive monitoring system for corrosion damage detection of submerged plates using a pair of transducers arranged in pitch catch.…”

Section: Introductionmentioning

confidence: 99%

Crack detection of immersed metallic structure in water with surface oscillation using scanning laser pulse

Park¹,

Lee²,

Koo³

2016

Int. J. CMEM

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There are some difficulties of non-destructive test and evaluation for immersed or submerged structures such as nuclear reactor pipe line, submarine or huge ship. This paper proposes the method of damage detection of immersed metallic structure which has crack on weld zone and placed in the water with slight and random surface oscillation using ultrasonic wave propagation imaging (UWPI) system with piezoelectric transducer. A T-shape metallic structure with artificial surface crack on weld zone, which with size 2 mm by 0.3 mm and the depth 2 mm, used as the specimen. A 532 nm Q-switched continuous wave laser is used for scanning an area of 20 mm by 40 mm. A piezoelectric sensor with magnetic sensor head, which is attachable to metallic structure is used as a contact ultrasonic sensor. The tests are performed in three cases: a specimen without water, a specimen immersed in water and a specimen immersed in water with random surface oscillation. Ultrasonic wave propagation image algorithm and adjacent wave subtraction (AWS) algorithm are used for visualizing wave propagation and detecting the crack. For the case where the specimen is immersed in the water, the signal amplitude is increased compared with the specimen without water case. In AWS algorithm results of the immersed case, scattering waves which are generated by cracks were observed. In random surface oscillation case, the excitation laser beam is refracted randomly by Snell's law resulting in the diluted wave propagation images. However, improvements in signal-to-noise ratio using repeat scan technology enable to the detection of the crack and estimation of the crack size. This paper examines the damage detection using ultrasonic wave propagation caused by laser excitation from outside of the water even when the water surface oscillation exists and implies the possibility of application of ultrasonic propagation imaging system to submerged structures.

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Ultrasonic guided waves for monitoring corrosion in submerged plates

Cited by 53 publications

References 26 publications

Defects Detection and Localization in Underwater Plates Using Laser Laterally Generated Pure Non-Dispersive S0 Mode

Defects Detection and Localization in Underwater Plates Using Laser Laterally Generated Pure Non-Dispersive S0 Mode

A model‐based method for damage detection with guided waves

Crack detection of immersed metallic structure in water with surface oscillation using scanning laser pulse

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