Lamb wave defect detection and evaluation using a fully non-contact laser system

Ma, Zhaoyun; Yu, Lingyu

doi:10.1117/12.2514048

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…As shown in Figure 2 a,b, when the single pulse energy of the excitation laser was 25 mJ, in the t - s wavefield and f - k domain, the A

mode was prominent, but the S

mode was barely visible. In contrast, Figure 2 c,d shows that when the energy was 100 mJ, a distinct A

mode and a faint S

mode could be observed, indicating that out-of-plane displacement could be enhanced by increasing pulse energy [ 32 ]. However, surface ablation occurs at this time, and it is necessary to ensure that the material surface is not ablated.…”

Section: Characteristics Of Lu-ldmmentioning

confidence: 99%

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A Review of Laser Ultrasonic Lamb Wave Damage Detection Methods for Thin-Walled Structures

Zheng

Luo

et al. 2023

Sensors

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Thin-walled structures, like aircraft skins and ship shells, are often several meters in size but only a few millimeters thick. By utilizing the laser ultrasonic Lamb wave detection method (LU-LDM), signals can be detected over long distances without physical contact. Additionally, this technology offers excellent flexibility in designing the measurement point distribution. The characteristics of LU-LDM are first analyzed in this review, specifically in terms of laser ultrasound and hardware configuration. Next, the methods are categorized based on three criteria: the quantity of collected wavefield data, the spectral domain, and the distribution of measurement points. The advantages and disadvantages of multiple methods are compared, and the suitable conditions for each method are summarized. Thirdly, we summarize four combined methods that balance detection efficiency and accuracy. Finally, several future development trends are suggested, and the current gaps and shortcomings in LU-LDM are highlighted. This review builds a comprehensive framework for LU-LDM for the first time, which is expected to serve as a technical reference for applying this technology in large, thin-walled structures.

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“…As shown in Figure 2 a,b, when the single pulse energy of the excitation laser was 25 mJ, in the t - s wavefield and f - k domain, the A

mode was prominent, but the S

mode was barely visible. In contrast, Figure 2 c,d shows that when the energy was 100 mJ, a distinct A

mode and a faint S

Section: Characteristics Of Lu-ldmmentioning

confidence: 99%

“… ( a ) Time-space ( t - s ) wavefield and ( b ) frequency-wavenumber domain ( f - k domain) maps of ultrasonic Lamb waves excited by a laser at a single pulse energy of 25 mJ. ( c ) t - s wavefield and ( d ) f - k domain maps of ultrasonic Lamb waves excited by laser at a single pulse energy of 100 mJ [ 32 ]. …”

Section: Figurementioning

confidence: 99%

A Review of Laser Ultrasonic Lamb Wave Damage Detection Methods for Thin-Walled Structures

Zheng

Luo

et al. 2023

Sensors

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show abstract

“…Among them the laser-based techniques are still the truly remote means and can be placed a few feet away from the samples. GUW is often generated by a nanosecond pulsed laser to heat a small surface area in a short time to cause thermal expansion in either thermoelastic or ablation regimes [9]. For GUW wave remote sensing, scanning Laser Doppler vibrometer (SLDV) has been adopted in recent years since it can measure time-space wavefield and allow for the acquisition of frequency-wavenumber information through multidimensional Fourier transform [9].…”

Section: Introductionmentioning

confidence: 99%

Thickness measurement of metal components using guided waves and fully non-contact PL-SLDV system

Campbell,

Xiao,

Metzger

et al. 2024

Health Monitoring of Structural and Biological Systems XVIII

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Effective NDE inspection systems and methods are highly desired in a broad range of engineering applications including metal structure thickness evaluation. Laser-generated ultrasound has been studied to excite wideband Lamb waves for NDE. By using the ultrasound in conjunction with multidimensional wavefield measurements, obtained by high spatial resolution noncontact laser scanning vibrometer, thickness evaluations for metal components can be achieved. This paper applies a fully noncontact/remote ultrasonic Lamb wave NDE system and explores its application for thickness characterization and evaluation of metal components. This paper first demonstrates the actuation and sensing of Lamb waves in metal components. The non-contact system consists of a pulsed laser (PL) working in the thermoelastic regime to excite Lamb waves and scanning laser Doppler vibrometer (SLDV) sensing the waves and providing high-resolution multidimensional wavefield signals for evaluation. Enhancements through sensing, actuation parameters, and surface enhancement were attempted to excite very high-frequency Lamb waves. The results show that excited Lamb waves can have a frequency beyond 1 MHz in certain components thinner than 1 mm. The paper continues to show how the acquired Lamb waves can be used for measuring the thickness of the metal components. The method adopted multidimensional Fourier analysis to convert time-space wavefield measurements to frequency-wavenumber representation. The resulting spectrum is then compared to theoretical dispersion curves in frequency-wavenumber for thickness matching to derive the thickness parameter. Proof-of-concept tests were performed with aluminum components of various thicknesses first and then the method was applied to much thinner foil-type material and components made of different materials.

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Excitation and sensing of Lamb waves in very thin metals and nuclear cladding material using fully non-contact PL-SLDV system

Compton

Sun²,

2022

Health Monitoring of Structural and Biological Systems XVI

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Lamb wave defect detection and evaluation using a fully non-contact laser system

Cited by 3 publications

References 19 publications

A Review of Laser Ultrasonic Lamb Wave Damage Detection Methods for Thin-Walled Structures

A Review of Laser Ultrasonic Lamb Wave Damage Detection Methods for Thin-Walled Structures

Thickness measurement of metal components using guided waves and fully non-contact PL-SLDV system

Excitation and sensing of Lamb waves in very thin metals and nuclear cladding material using fully non-contact PL-SLDV system

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