Thin-Plate Imaging Inspection Using Scattered Waves Cross-Correlation Algorithm and Non-Contact Air-Coupled Transducer

Xiao, Wenfeng; Yu, Lingyu

doi:10.1115/1.4048541

Cited by 3 publications

(5 citation statements)

References 28 publications

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“…The stainless steel specimens were monitored for crack extension under fatigue loading with quantification errors as low as 2% for 5 mm cracks. In a subsequent study [ 44 ], they constructed a fully non-contact detection system with ACT-SLDV to achieve high-precision imaging of notches in thin stainless steel plates with varying lengths, depths, and orientations. He et al [ 62 ] proposed innovative imaging conditions which can compensate for the attenuation effect due to distance.…”

Section: Detection Methods Based On Full Wavefield Datamentioning

confidence: 99%

“…In laser ultrasonic detection systems, the transmitting and receiving devices are not integrated, and the instrument configuration is flexible. The laser vibrometer can cooperate with an air-coupled transducer (ACT) and a lead zirconate titanate transducer (PZT), and the laser can cooperate with PZT, ACT and fiber Bragg grating (FBG) sensor [ 18 , 44 , 45 , 46 ]. In addition, a new air-coupled optical microphone is also used as a vibrometer to cooperate with the laser [ 47 ].…”

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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Section: Detection Methods Based On Full Wavefield Datamentioning

confidence: 99%

Section: Characteristics Of Lu-ldmmentioning

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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“…Xiao 196 investigated damage detection of CFRP composite plates with purposely-built single/double delaminations during the ply lay-up process using a resonant type focused ACT (120 kHz) for Lamb wave generation and SLDV for detection. Two-dimensional time–space wavefield of ACT actuated Lamb waves in the composites of single delamination case and double delamination case were collected by the SLDV scanning to be then filtered into incident and scattered waves and cross-correlated to obtain the delamination imaging.…”

Section: Ut Performed Using Acts With Several Configurationsmentioning

confidence: 99%

“…Through comparing the single and double delaminations imaging, it is noted that stronger intensity of the double delamination is observed, which is consistent with severe damage case in double delamination composite, demonstrating that the cross-correlation imaging technique is capable of detecting the severity of the damage in the composite structure. Figure 7 196 shows the imaging results and the capability of the ACT–SLDV system in localizing and detecting the severity of the damage in the composite structure.…”

Section: Ut Performed Using Acts With Several Configurationsmentioning

confidence: 99%

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Noncontact nondestructive ultrasonic techniques for manufacturing defects monitoring in composites: a review

Mortada,

El Mousharrafie,

Mahfoud

et al. 2023

Structural Health Monitoring

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Composite materials are widely used in most industries due to their high specific strength, specific stiffness, and their relatively lighter weight compared to other traditional materials. However, the presence of defects arising from manufacturing processes or during service loads can make these structures more susceptible to a diminished performance. Furthermore, the former defects are inevitable in composite structures, but they can be reduced. Each type of defect requires specific inspection techniques and configurations. In this work, a review of the different types of composites manufacturing processes and their corresponding resultant defects is presented with the various nondestructive evaluation techniques employed for these defects’ characterization. The emphasis of this paper is on ultrasonic inspection and detection techniques for they present high sensitivity to surface/subsurface discontinuities, superior depth of ultrasonic penetration for flaw detection, feasibility on large scales, and instantaneous and detailed images production. Notably, noncontact ultrasonic testing techniques are also reviewed, air-coupled techniques in specific, and highlighted as a fine alternative to conventional contact inspection systems as they reduce the restrictions that coexist with the use of couplants. Moreover, these ultrasonic testing techniques are summarized to show the latest research progress achieved in the field of air-coupled ultrasonic inspection systems for manufacturing defects’ monitoring in composite structures including delamination, porosity, dryness, waviness, and resin lack/excess. Finally, we highlight the type and central frequency of the transducers and experimental results present in literature and obtained in terms of both detection and size of the defects.

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Delamination imaging in composites using cross-correlation method by non-contact air-coupled Lamb waves

Yu,

Xiao,

Mei

et al. 2023

Smart Mater. Struct.

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This paper presents a cross-correlation damage detection technique using damage scattered waves of all directions cross-correlate with the incident waves for delamination imaging in carbon fiber reinforced polymer (CFRP) composite plate. The presented imaging can not only detect the delamination but also precisely quantify the damage with locations and sizes. First, a CFRP composite sample with interlaminar delamination by inserting the Teflon layer is designed and manufactured in house using the hot-press machine. And three-dimensional (3D) model of composite sample is simulated using the finite element method. Next, the cross-correlation imaging algorithm is introduced in detail, and the cross-correlation imaging proof-of-concept study is conducted with the simulated Lamb waves in the composite sample. Finally, a fully non-contact air-coupled transducer and scanning laser Doppler vibrometer system with a single-mode Lamb wave method is established to actuate and sense the interrogating Lamb waves in the structure. The imaging method is experimentally implemented for the one delamination and two delaminations imaging and quantification.

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Thin-Plate Imaging Inspection Using Scattered Waves Cross-Correlation Algorithm and Non-Contact Air-Coupled Transducer

Cited by 3 publications

References 28 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

Noncontact nondestructive ultrasonic techniques for manufacturing defects monitoring in composites: a review

Delamination imaging in composites using cross-correlation method by non-contact air-coupled Lamb waves

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