Health monitoring of composite structures by embedded FBG and interferometric Fabry–Pérot sensors

Oliveira, Rui de; Ramos, Carlos; Marques, A.T.

doi:10.1016/j.compstruc.2007.01.040

Cited by 79 publications

(58 citation statements)

References 7 publications

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“…They have the advantages of high sensitively and high spatial resolution. Based on single mode optical fibers, the three most widely employed interferometric configurations are: Mach-Zehnder [8], Michelson [9] with a two-arm interferometer and Fabry-Pérot [10][11][12] with a single arm interferometer.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Adhesive and Bonding Length on the Strain Transfer of Optical Fiber Sensors

Her

Huang

2016

Applied Sciences

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Optical fiber sensors have been extensively adapted as structural health monitoring devices. Due to the existence of the adhesive layer, a portion of the strain is absorbed by the adhesive. As a result, the structural strain sensed by the optical fiber is underestimated and required to be corrected. An analytical solution is presented through which it is possible to establish the relationship between the strains in the host structure and the surface bonded optical fiber sensor. Experimental measurements based on the Mach-Zehnder interferometric technique were performed to validate the theoretical prediction and reveal the differential strains between the optical fiber strain sensor and test specimen. Parametric studies show that the percentage of the strain in the test specimen actually transferred to the optical fiber is dependent on the bonding length of the optical fiber and the adhesive. The strain transfer is increasing from 56% to 82% as the bonding length increases from 5 cm to 12 cm with the epoxy adhesive. The general trend of the strain transfer obtained from both experimental tests and theoretical predictions shows that the longer the bonding length and the stiffer the adhesive, the more strain is transferred to the optical fiber.

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Section: Introductionmentioning

confidence: 99%

The Effects of Adhesive and Bonding Length on the Strain Transfer of Optical Fiber Sensors

Her

Huang

2016

Applied Sciences

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“…They consist of a core surrounded by a concentric cladding, with different refraction index, guaranteeing the light propagation (Figure 1(a)). Fibre Bragg gratings (Figure 1(b)) are formed when a periodic variation of the index of the refraction of the core is created along a section of an optic fibre, by exposing the optic fibre to an interference pattern of intense ultraviolet light [21]. The photosensitivity of silica glass permits the index of refraction in the core to be increased by the intense laser radiation λ B .…”

Section: Fibre Bragg Grating Sensormentioning

confidence: 99%

The Self-Healing Capability of Carbon Fibre Composite Structures Subjected to Hypervelocity Impacts Simulating Orbital Space Debris

Aïssa¹,

Tagziria²,

Haddad³

et al. 2012

ISRN Nanomaterials

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The presence in the space of micrometeoroids and orbital debris, particularly in the lower earth orbit, presents a continuous hazard to orbiting satellites, spacecrafts, and the international space station. Space debris includes all nonfunctional, man-made objects and fragments. As the population of debris continues to grow, the probability of collisions that could lead to potential damage will consequently increase. This work addresses a short review of the space debris "challenge" and reports on our recent results obtained on the application of self-healing composite materials on impacted composite structures used in space. Self healing materials were blends of microcapsules containing mainly various combinations of a 5-ethylidene-2-norbornene (5E2N) and dicyclopentadiene (DCPD) monomers, reacted with ruthenium Grubbs' catalyst. The self healing materials were then mixed with a resin epoxy and single-walled carbon nanotubes (SWNTs) using vacuum centrifuging technique. The obtained nanocomposites were infused into the layers of woven carbon fibers reinforced polymer (CFRP). The CFRP specimens were then subjected to hypervelocity impact conditions-prevailing in the space environment-using a home-made implosion-driven hypervelocity launcher. The different self-healing capabilities were determined and the SWNT contribution was discussed with respect to the experimental parameters.

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“…On the other hand, embedded sensors provide a high sensitivity to subsurface damage due to their proximity to the damage features [19]. Several works can be found in the literature about Fabry-Perot and Bragg grating sensors to characterize the strain due to mechanical behaviour of the CFRP [20][21][22][23][24]. Other more complex sensors are also based on optical fibres which are capable of detecting strain distribution with high spatial resolution and also gradient temperature evolution [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Carbon laminates with RE doped optical fibre sensors

et al. 2016

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Abstract:A new type of luminescent optical fibre sensor for structural health monitoring of composite laminates (CFRP) is proposed. The Nd 3+ doped multi-core doubleclad fibre incorporated in composite structure was used as a distributed temperature sensor. The change of luminescence intensity (Nd 3+ ions) at the wavelength of 880 nm ( 4 F 3/2 → 4 I 9/2 ) and 1060 nm ( 4 F 3/2 → 4 I 11/2 ) was used for internal temperature monitoring. The special construction of optical fibre was used as it assures an efficient pumping mechanism and, at same time, it increases the measuring sensitivity. The linear response with relative sensitivity 0.015 K −1 was obtained for temperature range from 30 up to 75 ∘ C. The manufacturing process of CFRP with embedded optical fibre sensor is also discussed.

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Health monitoring of composite structures by embedded FBG and interferometric Fabry–Pérot sensors

Cited by 79 publications

References 7 publications

The Effects of Adhesive and Bonding Length on the Strain Transfer of Optical Fiber Sensors

The Effects of Adhesive and Bonding Length on the Strain Transfer of Optical Fiber Sensors

The Self-Healing Capability of Carbon Fibre Composite Structures Subjected to Hypervelocity Impacts Simulating Orbital Space Debris

Carbon laminates with RE doped optical fibre sensors

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