Damage localization using contact and non-contact narrow frequency band elastic wave generation

Wandowski, T.; Mindykowski, D.; Kudela, P.; Radzienski, M.

doi:10.1016/j.measurement.2023.113504

Cited by 2 publications

(1 citation statement)

References 43 publications

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“…Apart from PZT, macrofiber composites and magnetorestrictive transducers have been used in the literature as well [2]. In recent times actuation using non contact techniques such as acoustic transducers and pulsed lasers have been proposed [3][4][5][6]. For the sensing, the active devices mentioned above have been paired up with scanning laser Doppler vibrometry as well as optical fiber based sensors such as Fabry-Pérot interferometers or fiber Bragg grating (FBG) sensors.…”

Section: Introductionmentioning

confidence: 99%

Developing self-calibrating system for fiber Bragg grating based guided wave sensing under changing temperature conditions

Soman,

Kudela

2024

Smart Mater. Struct.

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Fiber Bragg grating (FBG) sensors have long been thought of as the ideal sensors for structural health monitoring (SHM) due to their small size, light weight, ability to be embedded and ability to be multiplexed. So, FBG sensors have been commonly used for strain based SHM. In recent times, a renewed interest is seen in the use of FBG sensors for guided wave (GW) measurements using the edge filtering approach which increases the sensitivity several folds. They offer several unique opportunities for GW based SHM such as allowing mode filtering, acoustic coupling, etc. Unfortunately, more wide spread research is limited by the steep learning curve. Also, the use of FBG in real applications is still in its infancy due to the need of calibration of the system when the ambient temperature conditions change. This paper precisely tries to address these two shortcomings. For overcoming the steep learning curve, a detailed discussion on the hardware for the FBG based GW sensing is provided. Following the discussion a step-by-step approach is outlined for incorporating the sensors. A detailed trouble-shooting guide is developed based on the immense experience of the authors in this field. This exercise will allow easier adoption of the technique and stimulate more research in the topic. The exercise also allows us to highlight the safeguards and the features that need to be included in the system which will be self-calibrating. Once the design parameters are established a self-calibrating autonomous FBG based sensing system is developed. The developed system is tested in ambient conditions over an extended period in the day capturing the ambient temperature changes. The system is also tested in a larger temperature range (25 ∘C–65 ∘C). The results indicate that indeed the self-calibrating system works effectively. Some sensitivity studies to determine the performance in terms of system reaction time have also been provided. Such a ‘smart’ autonomous system for GW sensing has not been presented to the best of the author’s knowledge and is the key novelty of the presented work. Furthermore, the detailed discussions and troubleshooting guide will help introduce more people to this field of study which will lead to more radical development of the field.

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Section: Introductionmentioning

confidence: 99%

Developing self-calibrating system for fiber Bragg grating based guided wave sensing under changing temperature conditions

Soman,

Kudela

2024

Smart Mater. Struct.

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Non-contact detection of the interfacial microdefects in metal/CFRP hybrid composites using air-coupled laser ultrasound

Wang,

Cheng,

Liao

et al. 2024

Structural Health Monitoring

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Metal/CFRP (carbon fiber reinforced plastic) hybrid composites are crucial in aerospace applications, demanding non-contact, high-resolution inspection. Traditional non-destructive testing methods face daunting technical challenges due to varying densities and impedance between fiber and metal layers. Here, a hybrid air-coupled laser-ultrasound (ACLU) system was presented for non-contact detection of internal microdefects on the non-homogeneous metal/CFRP interface. The near-surface resolution of the system can reach as high as 80 µm on a long effective working distance of 50 mm. Three types of experiments, specifically ACLU, phased-array, and X-ray inspection, were performed in Al/CFRP composites with the interfacial microdefects located in Al, bonded, and CFRP layers respectively. Comparing with traditional methods, the proposed ACLU system can detect the microdefects of bonding failure, cohesive failure, and delamination at the Al/CFRP interface with higher contrast, resolution, and sensitivity. A significant advantage of the ACLU system is its ability to detect defects on curved surface structure materials, making it highly versatile for various composite configurations. Our eventual goal is to offer an affordable non-contact laser-ultrasound approach for quality and damage inspection of metal/CFRP hybrid composites.

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Damage localization using contact and non-contact narrow frequency band elastic wave generation

Cited by 2 publications

References 43 publications

Developing self-calibrating system for fiber Bragg grating based guided wave sensing under changing temperature conditions

Developing self-calibrating system for fiber Bragg grating based guided wave sensing under changing temperature conditions

Non-contact detection of the interfacial microdefects in metal/CFRP hybrid composites using air-coupled laser ultrasound

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