Guided-Wave Tomographic Imaging of Plate Defects by Laser-Based Ultrasonic Techniques

Park, Junpil; Lim, Ju Young; Cho, Younho

doi:10.7779/jksnt.2014.34.6.435

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…In this paper, the specimen is much thicker than the ones used in other Lamb wave inspection [6,7,8,9,10,11,12,13,14,15,16,17,19,20,21]. It means that the Lamb wave with dominant longitudinal displacement, where displacement or power flux is concentrated on the outside surface, can be the sustainable mode for energy loss and attenuation.…”

Section: Theoretical Fundamentalsmentioning

confidence: 99%

“…Lamb wave RAPID tomography has been used successfully in a number of applications ranging from material loss verification to penetrated-hole detection [9]. The work to date has been primarily performed using contact transducers [10,11,12,13], air-coupled transducers [14,15], and laser ultrasound [16,17]. Significant literature has been published on Lamb wave pipe inspection applications [18,19,20].…”

Section: Introductionmentioning

confidence: 99%

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An Investigation on a Quantitative Tomographic SHM Technique for a Containment Liner Plate in a Nuclear Power Plant with Guided Wave Mode Selection

Lee

Cho

2019

Sensors

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The containment liner plate (CLP) in a nuclear power plant is the most critical part of the structure of a power plant, as it prevents the radioactive contamination of the surrounding area. This paper presents feasibility of structural health monitoring (SHM) and an elastic wave tomography method based on ultrasonic guided waves (GW), for evaluating the integrity of CLP. It aims to check the integrity for a dynamic response to a damaged isotropic structure. The proposed SHM technique relies on sensors and, therefore, it can be placed on the structure permanently and can monitor either passively or actively. For applying this method, a suitable guided wave mode tuning is required to verify wave propagation. A finite element analysis (FEA) is performed to figure out the suitable GW mode for a CLP by considering geometric and material condition. Furthermore, elastic wave tomography technique is modified to evaluate the CLP condition and its visualization. A modified reconstruction algorithm for the probabilistic inspection of damage tomography algorithm is used to quantify corrosion defects in the CLP. The location and shape of the wall-thinning defects are successfully obtained by using elastic GW based SHM. Making full use of verified GW mode to Omni-directional transducer, it can be expected to improve utilization of the SHM based evaluation technique for CLP.

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Section: Theoretical Fundamentalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Investigation on a Quantitative Tomographic SHM Technique for a Containment Liner Plate in a Nuclear Power Plant with Guided Wave Mode Selection

Lee

Cho

2019

Sensors

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“…The work to date has been primarily undertaken with contact transducers, 6-10 aircoupled transducers, 11,12 and laser ultrasound. 13 Significant work has also been published on Lamb wave, pipe inspection applications. 14 Earlier researches show qualitative defect imaging with ghost imaging which couldn't express the exact size of defect.…”

Section: Introductionmentioning

confidence: 98%

Quantitative tomographic visualization for irregular shape defects by guided wave long range inspection

Lee

Sheen

Cho

2015

Int. J. Precis. Eng. Manuf.

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Ultrasonic guided waves have been proven as a promising tool for structure health monitoring due to their capability of interrogating a large structure from a single transducer position. This study presents the guided wave tomographic imaging in structural health monitoring for detecting cracks and visualization by reconstruction algorithm for the probabilistic inspection of damage. The variable shape factor is suggested for quantitative defect shape and sizing by reconstruction image. The defect of irregular boundary imaging with variable shape factor is precisely reconstructed by advanced RAPID algorithm with limited number of transducers. The particular application of interest is defect imaging of symmetric wave modes with irregular shape defect in plate-like structures. A preliminary study of tomographic imaging by guided waves in a plate-like structure provides guidelines for the quantitative defect imaging.

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Design of an innovative and self-adaptive-smart algorithm to investigate the structural integrity of a rail track using Rayleigh waves emitted and sensed by a fully non-contact laser transduction system

2020

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Guided-Wave Tomographic Imaging of Plate Defects by Laser-Based Ultrasonic Techniques

Cited by 5 publications

References 10 publications

An Investigation on a Quantitative Tomographic SHM Technique for a Containment Liner Plate in a Nuclear Power Plant with Guided Wave Mode Selection

An Investigation on a Quantitative Tomographic SHM Technique for a Containment Liner Plate in a Nuclear Power Plant with Guided Wave Mode Selection

Quantitative tomographic visualization for irregular shape defects by guided wave long range inspection

Design of an innovative and self-adaptive-smart algorithm to investigate the structural integrity of a rail track using Rayleigh waves emitted and sensed by a fully non-contact laser transduction system

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