Laser ultrasonic propagation imaging method in the frequency domain based on wavelet transformation

Lee, Jung-Ryul; Chia, Chen Ciang; Shin, Hye Jin; Park, Chan-Yik; Yoon, Dong‐Jin

doi:10.1016/j.optlaseng.2010.07.008

Cited by 79 publications

(76 citation statements)

References 14 publications

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“…An ultrasonic wave propagation imaging (UWPI) system consists of a Q-switched laser system, a laser mirror scanner based on a galvanometer, an ultrasonic sensor, a highspeed digitizer, and an image processor that was re-arranged based on information in a previous work [1]. A Q-switched Nd: YAG diode-pumped solid-state laser is used for the pulsed laser system, which has the wave length of 532nm and maximum pulse repetition frequency of 20Hz [9].…”

Section: Ultrasonic Wave Propagation Imaging (Uwpi) Processmentioning

confidence: 99%

“…Additionally, reliable SHM/NDT methods must be intuitive, so that inspection results can be easily understood, and must have high throughput [1]. To tackle this issue, many studies based on acoustic and ultrasonic technologies have been proposed using a laser interferometry, a laser vibrometer, and a pulsed laser etc., because the ultrasonic waves are very sensitive to the mechanical properties of structures.…”

Section: Introductionmentioning

confidence: 99%

“…To overcome these drawbacks, a laser beam pulse can be used to generate ultrasonic waves. The laser beam pulse can provide many advantages including fast wave generation with low pulse energy, high spatial resolution, inspection ability on a complex target, and so on [1].…”

Section: Introductionmentioning

confidence: 99%

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Delamination Visualization in CFRP Laminated Concrete Structures Using Pulsed Laser-Based Ultrasonic Propagation Images

Lee¹,

Park²

2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Abstract:One of the most critical characteristics of concrete structures is the brittleness of the concrete and hence the concrete is vulnerable to tension force. To overcome this drawback, the use of carbon-fiber-reinforced polymer (CFRP) sheets and/or plates laminated on the surface of concrete structures has increased. However, the efficiency of the CFRP reinforcement to endure the tension force is reduced when the CFRP sheets and/or plates are delaminated from the concrete structures due to external loads and impacts during service. This study presents the application of a pulsed laser scanned ultrasonic wave propagation imaging technique for detecting delamination damage of the CFRP laminated concrete structures. For the experimental studies, the delamination was artificially formed when the CFRP sheets were attached on the concrete structures and scanned using the Nd: YAG pulsed laser scanning system. By applying a frequency-wavenumber filtering algorithm to the wave responses measured from the Nd: YAG pulsed laser scanning system, flaw images of the delamination of the CFRP sheets were successfully obtained. This result confirmed the feasibility of the pulsed laser scanned ultrasonic wave propagation imaging technique to serve as an effective structural health monitoring system for actual CFRP laminated concrete structures.

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Section: Ultrasonic Wave Propagation Imaging (Uwpi) Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Delamination Visualization in CFRP Laminated Concrete Structures Using Pulsed Laser-Based Ultrasonic Propagation Images

Lee¹,

Park²

2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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“…Numerous studies on Lamb wave applications to detect damage in large structures such as airplanes, factories, and ships are underway. Lamb wave generation techniques can be divided into two main categories: those using a contact-type device (e.g., piezoelectric zirconate titanate) [8][9][10][11][12][13][14][15][16][17][18][19][20][21] and those using a non-contact type device [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] . Damage detection using a contact-type device seems inefficient, but inserting the device into a target structure can improve the efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Non-contact type devices include air-coupled transducers [37,38] and laser thermoelasticities [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] . The former involves placing an air-coupled transducer near the Lamb wave generation point on the target structure, and the vibration of the transducer is transmitted through the medium (air in this case).…”

Section: Introductionmentioning

confidence: 99%

Non-contact and non-destructive Lamb wave generation using laser-induced plasma shock wave

Hosoya

Yoshinaga

Kanda

et al. 2018

International Journal of Mechanical Sciences

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a b s t r a c tThis paper proposes a non-contact and non-destructive method to generate Lamb waves against a target structure using the impulse excitation force generated by laser-induced plasma (LIP). When a high power pulse laser is irradiated in air and its laser fluence exceeds 10 15 W/m 2 , a plasma is formed. While the plasma in air expands in high speed, shock waves on the spherical surface are generated and these shock waves become the impulse excitation force against a target structure, resulting in the non-contact and non-destructive approach. A 2024 aluminum alloy plate is used as the test piece in the experiment, and the dynamic characteristics of the Lamb waves generated from LIP shock waves are measured. Phase velocity and group velocity of generated Lamb waves were compared to the calculated values from Rayleigh-Lamb frequency equations and we found that maximum error was 5% and its frequency component included at least 400 kHz. Further, we investigated the relationship between the distance from the LIP shock wave-generating location to a test piece and the dynamic characteristics of the generated Lamb waves. This method can control the amplitude and the frequency components of generated Lamb waves by changing this distance.

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Composite aircraft debonding visualization by laser ultrasonic scanning excitation and integrated piezoelectric sensing

Chia

Jeong

Lee

et al. 2012

Struct. Control Health Monit.

Self Cite

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SUMMARY Two aircraft wings made of carbon fiber‐reinforced plastic material were inspected using the laser‐based ultrasonic propagation imaging system for the visualization of manufacturing defect and damages of debonding mode. Hypotheses of the detection mechanism of composite debonding were presented and validated through the inspection results for the bonding lines of the composite wing structures. The inspection showed that the location, shape, and size of the poor bonding defect, artificial stringer tip debonding, and real skin–spar debonding can be visualized and/or measured from the imaging results. The performance of the imaging system was found better than that of a manual ultrasonic C‐scan in terms of spatial resolution and damage detectability. Another finding from the inspection was the occurrence of skin buckling between two riveted locations. Most importantly, the presence of structural elements or features such as spars, stringers, ribs, lugs, inspection windows, and even embedded PZT elements did not adversely affect the inspection. Copyright © 2012 John Wiley & Sons, Ltd.

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Laser ultrasonic propagation imaging method in the frequency domain based on wavelet transformation

Cited by 79 publications

References 14 publications

Delamination Visualization in CFRP Laminated Concrete Structures Using Pulsed Laser-Based Ultrasonic Propagation Images

Delamination Visualization in CFRP Laminated Concrete Structures Using Pulsed Laser-Based Ultrasonic Propagation Images

Non-contact and non-destructive Lamb wave generation using laser-induced plasma shock wave

Composite aircraft debonding visualization by laser ultrasonic scanning excitation and integrated piezoelectric sensing

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