2020
DOI: 10.1115/1.4048541
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Thin-Plate Imaging Inspection Using Scattered Waves Cross-Correlation Algorithm and Non-Contact Air-Coupled Transducer

Abstract: This paper presents a non-contact air-coupled Lamb wave imaging technique using a two-dimensional (2D) cross-correlation method that not only detects the damage but also precisely quantifies for orientations and sizes. The air coupled transducers (ACT) is used together with a scanning laser Doppler vibrometer (SLDV) for sensing, making a fully non-contact Lamb wave system used for this study. We first show that single-mode Lamb wave actuation can be achieved by the air-coupled transducer (ACT) based on the Sne… Show more

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Cited by 3 publications
(5 citation statements)
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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%
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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%
“…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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