Hidden corrosion detection using laser ultrasonic guided waves with multi-frequency local wavenumber estimation

Gao, Tianfang; Sun, Hu; Hong, Yongmiao; Qing, Xinlin

doi:10.1016/j.ultras.2020.106182

Cited by 37 publications

(17 citation statements)

References 23 publications

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“…Within this class, there are the methods which use the local change in wavenumber of a guided wave at a defect. These methods are referred to as local wavenumber estimation, acoustic wavenumber spectroscopy or instantaneous wavenumber estimation [4][5][6][7][8], depending on the implementation of the method. Other linear guided wave NDT methods focus on the local change in wave amplitude or energy rather than the change in wavenumber.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear local wave-direction estimation for in-sight and out-of-sight damage localization in composite plates

Segers

Hedayatrasa

Poelman

et al. 2021

NDT & E International

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Section: Introductionmentioning

confidence: 99%

Nonlinear local wave-direction estimation for in-sight and out-of-sight damage localization in composite plates

Segers

Hedayatrasa

Poelman

et al. 2021

NDT & E International

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“…The proposed local wavenumber estimation was mapped using a sliding wavenumber band-pass filter to maximize the wave energy of every grid point at a specific mode and frequency. Currently, complete noncontact laser ultrasonic systems are mostly used for metallic materials [ 11 , 18 , 19 , 20 ]. In this study, aluminum foil was glued to the surface of the composite so that it was vulnerable to ablation and could achieve complete noncontact laser ultrasonic testing.…”

Section: Introductionmentioning

confidence: 99%

“…Filtering reconstruction imaging [ 29 ] confirmed that the increased wavenumbers were correlated with trapped waves of the delamination, and the energy map resulting from the wavenumber filtering was proven to be effective for single delamination detection. Spatial or local wavenumber [ 20 , 29 , 30 ] algorithms were applied to obtain wavenumber values at each spatial location by spatial or wavenumber windows; these algorithms highlighted the delamination damage with larger wavenumber values. The wavenumber adaptive image filtering method [ 31 ] was utilized to detect delamination at various impact energies.…”

Section: Introductionmentioning

confidence: 99%

A New Laser Ultrasonic Inspection Method for the Detection of Multiple Delamination Defects

2021

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Delamination is one of the most common types of defects for carbon fiber reinforced plastic (CFRP) composites. The application of laser techniques to detect delamination faces difficulties with ultrasonic wave excitation because of its low thermal conductivity. Much of the research that can be found in the literature has only focused on the detection of a single delamination. In this study, aluminum foil was pasted onto the surface of the composite so that it was vulnerable to ablation and could acquire a usable signal. Using a fully noncontact system with laser excitation at a fixed point and a scanning laser sensor, the effects of different aluminum foil sizes and shapes on the wavefield were studied for the composites; we decided to use a rectangle with 3 mm length and 5 mm width for laser excitation experiments. Wavefield characteristics of the composite plates were analyzed with single- and multi-layered Teflon inserts. Taking the time window for standard ultrasonic testing as a reference, the algorithms for localized wave energy with appropriate time windows are presented for the detection of single and multiple defects. The appropriate time window is meaningful for identifying each delamination defect. The algorithm performs well in delamination detection of the composites with one or multiple Teflon inserts.

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“…Next, multiple methods were developed which exploit the local change in wavenumber at a defect [15][16][17][18][19]. The local wavenumber estimation methods offer the additional advantage that the local wavenumber can be used for accurate estimation of the depth of the defect [19,20]. However, also these methods suffer from limitations.…”

Section: Introductionmentioning

confidence: 99%

Broadband nonlinear elastic wave modulation spectroscopy for damage detection in composites

Segers

Hedayatrasa

Poelman

et al. 2021

Structural Health Monitoring

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A non-destructive testing procedure is proposed for damage detection in composites using full wavefield measurement obtained using a scanning laser Doppler vibrometer. Vibrations are excited using two low-power piezoelectric actuators leading to nonlinear elastic wave modulation at the defect. One actuator is supplied with a broadband chirp signal and the other actuator is supplied with a single-frequency sine signal. First, a time–frequency filtering method is proposed to extract specific nonlinear components of interest (e.g. second higher harmonic and first modulation sideband) without the need for multiple excitation sequences. Next, damage maps are constructed using broadband bandpower calculation of the filtered nonlinear components. It is demonstrated that the modulation sidebands provide an exclusive imaging of defect nonlinearity, and are not affected by potential source nonlinearity. The proposed damage map construction procedure is applied for various carbon fiber reinforced polymer test specimens with different damage features: (1) coupon with quasi-static indentation damage, (2) coupon with artificial delaminations, (3) bicycle frame with impact damage, and (4) stiffened aircraft panel with partially debonded stiffener. The obtained results indicate the high performance of the developed procedure for detection of various defect types in curved and/or stiffened carbon fiber reinforced polymer components.

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Hidden corrosion detection using laser ultrasonic guided waves with multi-frequency local wavenumber estimation

Cited by 37 publications

References 23 publications

Nonlinear local wave-direction estimation for in-sight and out-of-sight damage localization in composite plates

Nonlinear local wave-direction estimation for in-sight and out-of-sight damage localization in composite plates

A New Laser Ultrasonic Inspection Method for the Detection of Multiple Delamination Defects

Broadband nonlinear elastic wave modulation spectroscopy for damage detection in composites

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