Study on cracks defect inspection for GFRP laminates using laser excitation chirp pulsed photothermal radar imaging (CP-PRI)

Liu, Junyan; Dong, Boyuan; Wang, Fei; Wang, Yang; Chen, Mingjun; Liu, Guobin

doi:10.1016/j.infrared.2021.103689

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…Chirp signals, also known as linear frequency-modulated signals, have been widely applied in various fields such as communication, radar, sonar, biomedical, and seismic exploration due to their excellent noise immunity and strong penetration capabilities. Additionally, they are often used as signal models to simulate various natural phenomena [21,22]. With the rapid development of signal technology, some scholars have integrated digital signals with non-destructive testing.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Grouting Quality Detection in Prestressed Pipeline Based on Scattered Wave Method

Ye,

Wu,

Wang

et al. 2024

Buildings

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The grouting quality of prestressed pipelines directly affects the safety and durability of prestressed reinforced concrete bridge structures, attracting wide attention from the engineering community. Based on the principles of the scattering wave method, this paper designs and manufactures a large-scale model to simulate the actual construction testing environment. Several sets of design defects with significantly distributed spans in the prestressing ducts were pre-set, and the Engineering Geophysical Instrument System–Pipeline Grouting Profile (EGS-PGP) equipment developed was used to detect the grouting quality of the prestressed pipelines under different conditions, obtaining the frequency attenuation values at defect locations. The study shows that stability of the peak frequency throughout the test can indicate compact grouting, while a large fluctuation in the peak frequency range with no regular changes can indicate non-compact grouting; a sudden increase or decrease in peak frequency can effectively indicate the location of grouting defects along the pipeline. The number of sudden changes in frequency can indicate the number of gaps inside the pipeline. The chirp signal, compared to the hammer impact signal, shows greater stability and engineering application value in detecting defects using the scatter wave method. This study provides technical support for the detection of grouting quality in prestressed pipelines based on chirp signals.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Grouting Quality Detection in Prestressed Pipeline Based on Scattered Wave Method

Ye,

Wu,

Wang

et al. 2024

Buildings

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“…In our recent study [2], we indicated that ultrasonic testing is one of the most widely used methods to evaluate defects and structural damage in fiber-reinforced composite materials, and it performs well in detecting both surface and deeply buried damage and defects. However, this method does have several limitations as it requires a coupling medium (except for airborne ultrasonic), lacks the sensitivity to shallow surface fracture defects, and is subjected to large attenuations of the sound waves when propagating in multilayered composite materials such as GFRP composites [5,7]. Additional NDT&E techniques have also been used for the testing of GFRP composite materials, including X-ray radiography, infrared thermography (IRT), optical coherence tomography (OCT), optical interferometric techniques (e.g., moiré interferometry, holographic interferometry, speckle interferometry, electronic speckle pattern interferometry (ESPI), digital speckle correlation, and shearography and their subsequent variations), acoustic emission (AE), vibration testing, strain monitoring, and microwave, etc.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Spectroscopic Characterization and Thickness Evaluation of Internal Delamination Defects in GFRP Composites

Nsengiyumva

Zhong

Luo

et al. 2023

Chin. J. Mech. Eng.

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The use of terahertz time-domain spectroscopy (THz-TDS) for the nondestructive testing and evaluation (NDT&E) of materials and structural systems has attracted significant attention over the past two decades due to its superior spatial resolution and capabilities of detecting and characterizing defects and structural damage in non-conducting materials. In this study, the THz-TDS system is used to detect, localize and evaluate hidden multi-delamination defects (i.e., a three-level multi-delamination system) in multilayered GFRP composite laminates. To obtain accurate results, a wavelet shrinkage de-noising algorithm is used to remove the noise from the measured time-of-flight (TOF) signals. The thickness and location of each delamination defect in the z-direction (i.e., through-the-thickness direction) are calculated from the de-noised TOF signals considering the interaction between the pulsed THz waves and the different interfaces in the GFRP composite laminates. A comparison between the actual and the measured thickness values of the delamination defects before and after the wavelet shrinkage denoising process indicates that the latter provides better results with less than 3.712% relative error, while the relative error of the non-de-noised signals reaches 16.388%. Also, the power and absorbance levels of the THz waves at every interface with different refractive indices in the GFRP composite laminates are evaluated based on analytical and experimental approaches. The present study provides an adequate theoretical analysis that could help NDT&E specialists to estimate the maximum thickness of GFRP composite materials and/or structures with different interfaces that can be evaluated by the THz-TDS. Also, the accuracy of the obtained results highlights the capabilities of the THz-TDS for the NDT&E of multilayered GFRP composite laminates.

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“…In our earlier study [2], it was revealed that ultrasonic testing is one of the most widely used methods in composite material testing, and it performs quite well in detecting both the surface and deeply buried damage and defects. However, this method does have several limitations as it requires a coupling medium (except for airborne ultrasonic), lacks the sensitivity to shallow surface fracture defects, and is subjected to large attenuations of the sound waves when propagating in multilayered composite materials [4], [6]. Additional NDT&E techniques have also been used for the testing of GFRP composite materials, including X-ray radiography, infrared thermography (IRT), optical coherence tomography (OCT), optical interferometric techniques (e.g.…”

Section: Introductionmentioning

confidence: 99%

ISSI 2021: Terahertz Spectroscopic Characterization and Thickness Evaluation of Internal Delamination Defects in GFRP Composites

Nsengiyumva,

ZHONG,

Luo

et al. 2022

Preprint

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In recent years, terahertz time-domain spectroscopy (THz-TDS) has attracted significant attention due to its superior time and spatial resolution as well as its capabilities of localizing and characterizing internal defects in glass-fiber-reinforced polymer-matrix (GFRP) composite materials. In this study, the THz-TDS system is used to detect and evaluate hidden multi-delamination in plastic multilayered GFRP composite laminates. To remove the noise from the time-of-flight (TOF) signals, a wavelet shrinkage de-noising algorithm was used, leading to enhanced THz signals and further enabling an easy localization and evaluation of overlapping multi-delamination defects in GFRP composite laminates. In particular, both the thicknesses and locations of these delamination defects in the z-direction (i.e., through-the-thickness direction) were analyzed and measured considering the interaction between pulsed THz waves and the GFRP composite laminate. THz wave power and absorbance levels at every interface with different refractive indices in the GFRP composite samples were discussed based on analytical and experimental results. The present study shows the capabilities of the THz-TDS for the spectroscopic characterization of composite materials and helps users to know how they can theoretically estimate the thickness of the composite material that can be nondestructively evaluated by the THz-TDS.

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Study on cracks defect inspection for GFRP laminates using laser excitation chirp pulsed photothermal radar imaging (CP-PRI)

Cited by 8 publications

References 19 publications

Experimental Study on Grouting Quality Detection in Prestressed Pipeline Based on Scattered Wave Method

Experimental Study on Grouting Quality Detection in Prestressed Pipeline Based on Scattered Wave Method

Terahertz Spectroscopic Characterization and Thickness Evaluation of Internal Delamination Defects in GFRP Composites

ISSI 2021: Terahertz Spectroscopic Characterization and Thickness Evaluation of Internal Delamination Defects in GFRP Composites

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