Adhesive bond failure monitoring with triboluminescent optical fiber sensor

Shohag, Abu; Hammel, Emily; Olawale, David; Okoli, Okenwa I.

doi:10.1117/12.2223899

Cited by 9 publications

(6 citation statements)

References 15 publications

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“…The response speed is another crucial parameter for PDs, which reveals its capability to follow a fast-varying optical signal. Fast and reproducible responses to light illumination are important for high-performance PDs for application in smart systems, image sensing, structural health monitoring, and optical communication. ,− Figure a presents the illustration of the setup for response time measurement. The response time of the CsI(PbBr 2 ) 0.99 (AgI) 0.01 perovskite PD was measured using a 470 nm pulse light source from an LED and driven by a function generator with square waves at a frequency of 500 Hz under ambient condition.…”

Section: Results and Discussionmentioning

confidence: 99%

Enhanced Inorganic CsPbIBr₂ Perovskite Film for a Sensitive and Rapid Response Self-Powered Photodetector

et al. 2020

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Inorganic cesium lead halide CsPbI x Br3–x (x = 0–3) perovskites have recently gained considerable attention as semiconductor materials for the fabrication of photodetectors due to their high thermal and environmental stability. However, preparing high-quality CsPbI x Br3–x perovskite films using a simple spin-coating method is challenging. This study focused on enhancing the performance of a solution-processed all-inorganic CsPbI x Br3–x (x = 1, CsPbIBr2) photodetector using a silver iodide (AgI) additive. Introducing a small amount of AgI into the CsPbIBr2 precursor solution resulted in perovskite films that were more uniform and exhibited compact surface morphology that improved crystallinity and electronic properties. To further explore the influence of the AgI-modified CsPbIBr2 perovskite film on the device performance, we fabricated a self-powered photodetector with the geometry of fluorine-doped tin oxide (FTO)/compact TiO2/CsI(PbBr2)0.99(AgI)0.01/2,2′,7,7′-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (Spiro-OMeTAD)/Au. Photoresponse analysis revealed that the photoresponsivity, on/off ratio, and response time of the CsI(PbBr2)0.99(AgI)0.01 perovskite photodetector were improved. Notably, the CsI(PbBr2)0.99(AgI)0.01 perovskite device showed a higher responsivity and an impressive detectivity of 0.43 A/W and 2.46 × 1011 Jones, respectively, in comparison to the pristine CsPbIBr2 device. This work demonstrates the excellent potential of using inorganic CsI(PbBr2)0.99(AgI)0.01 perovskites in applications for high-performance photodetectors.

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Section: Results and Discussionmentioning

confidence: 99%

Enhanced Inorganic CsPbIBr₂ Perovskite Film for a Sensitive and Rapid Response Self-Powered Photodetector

et al. 2020

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“…In addition, the state-of-art sensor technology can be used to predict the bond failure of the adhesive joint in wind blades. Shohag et al (2016) proposed a novel sensing system called the in-situ triboluminescent optical fiber (ITOF) sensor for monitoring the initiation and propagation of disbonds in composite adhesive joints. It was shown in their work that ITOF sensor can detect real-time damage in adhesive joints which might otherwise be hidden.…”

Section: Damage Mitigation Techniquesmentioning

confidence: 99%

Damage mitigation techniques in wind turbine blades: A review

et al. 2017

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Wind blades are major structural elements of wind turbines, but they are prone to damage like any other composite component. Blade damage can cause sudden structural failure and the associated costs to repair them are high. Therefore, it is important to identify the causation of damage to prevent defects during the manufacturing phase, transportation, and in operation. Generally, damage in wind blades can arise due to manufacturing defects, precipitation and debris, water ingress, variable loading due to wind, operational errors, lightning strikes, and fire. Early detection and mitigation techniques are required to avoid or reduce damage in costly wind turbine blades. This article provides an extensive review of viable solutions and approaches for damage mitigation in wind turbine blades.

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“…Triboluminescence, also known as fractoluminescence, 20 piezoluminescence, 21 or mechanoluminescence, 22 is the ability of a material to emanate light when scratched, stressed, or fractured. [23][24][25] Throughout the years, numerous research works have used in situ triboluminescent optical fiber (ITOF) sensors for structural health monitoring of composite and concrete structures [26][27][28][29][30][31][32][33][34][35][36] or to fabricate load sensors. 37,38 An ITOF sensor integrates the highly desirable features of polymer optical fibers (POFs) with the TL property of manganese-doped zinc sulfide (ZnS:Mn), which is one of the brightest inorganic crystals.…”

Section: Introductionmentioning

confidence: 99%

“…No work has been done yet for damage monitoring in adhesive bond failure with TL sensor except a preliminary work done by Shohag et al 34 The preliminary study demonstrated that the integrated ITOF sensor can detect failure in adhesive bond under tension and flexure loading.…”

Section: Introductionmentioning

confidence: 99%

Real-time damage monitoring in trailing edge bondlines of wind turbine blades with triboluminescent sensors

Shohag

Ndebele

Okoli

2018

Structural Health Monitoring

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Adhesively bonded joints in wind turbine blades, particularly trailing edge joints, are prone to damage due to highintensity stress concentrations, missing adhesive, or deficient bonds at the bonding surfaces. If not detected early, cracks or disbonds in the trailing edge might propagate rapidly resulting in catastrophic failure of the whole blade. No dedicated in situ sensor system is, as of now, available for real-time damage monitoring in the critical adhesively bonded joints. This article discusses the use of in situ triboluminescent optical fiber sensors for damage monitoring in adhesively bonded composite joints. Double cantilever beam and three-point bend end-notched flexure samples were fabricated from a thick glass fiber/vinyl ester composite and glued with a two-part methacrylate-based structural adhesive. The in situ triboluminescent optical fiber sensors were embedded into the adhesive layer. Double cantilever beam and three-point bend end-notched flexure tests were performed to determine the mode I and mode II fracture toughness of the adhesive joints, respectively. The results show that the triboluminescent emissions occur at the onset of damage when performing double cantilever beam and three-point bend end-notched flexure fracture tests on adhesively bonded composite panels of different adhesive thicknesses. The triboluminescent response increases with the fracture toughness of adhesive joints. The double cantilever beam and three-point bend end-notched flexure specimens undergo cohesive failure in the adherend thickness. Optical microscopy was utilized to obtain better insights of fracture lines. Results indicate that in situ triboluminescent optical fiber sensors can monitor damage in adhesive in real-time without generating false alarms.

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Adhesive bond failure monitoring with triboluminescent optical fiber sensor

Cited by 9 publications

References 15 publications

Enhanced Inorganic CsPbIBr₂ Perovskite Film for a Sensitive and Rapid Response Self-Powered Photodetector

Enhanced Inorganic CsPbIBr₂ Perovskite Film for a Sensitive and Rapid Response Self-Powered Photodetector

Damage mitigation techniques in wind turbine blades: A review

Real-time damage monitoring in trailing edge bondlines of wind turbine blades with triboluminescent sensors

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Adhesive bond failure monitoring with triboluminescent optical fiber sensor

Cited by 9 publications

References 15 publications

Enhanced Inorganic CsPbIBr2 Perovskite Film for a Sensitive and Rapid Response Self-Powered Photodetector

Enhanced Inorganic CsPbIBr2 Perovskite Film for a Sensitive and Rapid Response Self-Powered Photodetector

Damage mitigation techniques in wind turbine blades: A review

Real-time damage monitoring in trailing edge bondlines of wind turbine blades with triboluminescent sensors

Contact Info

Product

Resources

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Enhanced Inorganic CsPbIBr₂ Perovskite Film for a Sensitive and Rapid Response Self-Powered Photodetector

Enhanced Inorganic CsPbIBr₂ Perovskite Film for a Sensitive and Rapid Response Self-Powered Photodetector