Hidden corrosion detection in aircraft aluminum structures using laser ultrasonics and wavelet transform signal analysis

Silva, M Z; Gouyon, Remi; Lepoutre, F.

doi:10.1016/s0041-624x(02)00455-9

Cited by 85 publications

(39 citation statements)

References 6 publications

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“…Using TAPP, a received amplitude of more than 10 dB compared to that obtained by a normal piezoelectric transducer was accomplished. To examine the mode of the received waves, wavelet transform was performed [3,4,5]. Fig.…”

Section: Methodsmentioning

confidence: 99%

A tilted angle polarization type piezoelectric transducer for plate wave generation

Imano

2007

IEICE Electron. Express

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A tilted angle polarization type piezoelectric transducer (TAPP) is newly suggested to generate the Lamb waves in thin plate without wedge. The tilted angle between the TAPP and the aluminum plate is easily determined by Snell's law. Our new type TAPP with a tilted angle of 50 • for S0 mode Lamb wave generation was specially manufactured. Preliminary experiments have been performed to examine the usefulness of our TAPP. As a result, efficient radiation of S0 mode Lamb wave from TAPP was confirmed and was clearly identified by the wavelet transform analysis. Keywords: polarization, tilted angle, plate wave, Lamb wave Classification: New functional devices and materials References

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Section: Methodsmentioning

confidence: 99%

A tilted angle polarization type piezoelectric transducer for plate wave generation

Imano

2007

IEICE Electron. Express

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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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“…Besides the real wavelets, the complex Morlet/Gabor wavelets are often used. The Morlet wavelet was applied for the transient wave analysis in the dispersive media [5], the study of the interactions of the Lamb waves with circumferential notch in an aluminum alloyed pipeline [6], the research on the interactions of the Lamb waves with hidden corrosion defects in the aircraft aluminum structure [7], and the analysis of the multi-mode guided wave signals in the multi-wire cables [8]. Liu used the Gabor wavelet to analyze the signals of the circumferential guided waves to detect axial cracking in the pipeline [9].…”

Section: Introductionmentioning

confidence: 99%

Mode identification of broadband Lamb wave signal with squeezed wavelet transform

et al. 2017

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. It's proved that as an alternative tool, the squeezed wavelet transform could be used for the analysis of a broadband Lamb wave signal. An additional benefit of this transform is that it permits reconstruction of the original signal or its components, which is not possible for the reassigned scalogram.

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Hidden corrosion detection in aircraft aluminum structures using laser ultrasonics and wavelet transform signal analysis

Cited by 85 publications

References 6 publications

A tilted angle polarization type piezoelectric transducer for plate wave generation

A tilted angle polarization type piezoelectric transducer for plate wave generation

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

Mode identification of broadband Lamb wave signal with squeezed wavelet transform

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