Fiber-optic cable

Résumé

A fiber-optic cable, also known as an optical-fiber cable, is an assembly similar to an electrical cable but containing one or more optical fibers that are used to carry light. The optical fiber elements are typically individually coated with plastic layers and contained in a protective tube suitable for the environment where the cable is used. Different types of cable are used for optical communication in different applications, for example long-distance telecommunication or providing a high-speed data connection between different parts of a building. Design Optical fiber consists of a core and a cladding layer, selected for total internal reflection due to the difference in the refractive index between the two. In practical fibers, the cladding is usually coated with a layer of acrylate polymer or polyimide. This coating protects the fiber from damage but does not contribute to its optical waveguide properties. Individual coated fibers (or fibers formed into ribbons or b

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https://en.wikipedia.org/wiki/Fiber-optic_cable

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Strain Measurement Validation Of Embedded Fiber Bragg Gratings

Stefano Trono

This study investigates the influence of strain state distribution on the accuracy of embedded optical fiber Bragg gratings (FBGs) used as strain sensors. An optical fiber embedded parallel to adjacent structural fibers in a graphite epoxy quasi-isotropic (90/+/- 45/0)(S) lay-up is evaluated with mechanical loading parallel to the fiber optic direction. Finite element analysis (FEA) is used to evaluate the fiber optic sensors' responses both in the far field and near field regions of the mechanical grips. Comparison between experimental fiber optic strains, strain gauges, and FEA provides good correlation in the far field with differences of less than 1%. However, in the near field region, some discrepancies are found and attributed to birefringence arising from complex strain states.

2010

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Predicting sizing dependent bending rigidity of glass fibre bundles in sheet moulding compounds

Emmanuelle Comte, Jan-Anders Månson, Véronique Michaud

The effect of sizing on bending rigidity in fibre bundles was investigated. Particular attention was paid to the effect of film formers and anti-static agents on the behaviour of glass fibre bundles under forced packing conditions. The bending rigidity of different types of bundle was estimated through the nail test, the Kawabata test, and packing stress experiments coupled with micromechanical analysis. An analytical expression describing the packing stress versus fibre volume fraction was derived for bundles with elliptical cross-section. The predicted values for bending stiffness of bundles were in good agreement with direct experimental measurements. These showed that sizing formulation may affect bundle rigidity and the compressive behaviour of dry fibre suspensions.

2006

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The OptoMEA platform: a new tool combining local chemical stimulation with distributed multi-electrode array recordings

Diego Ghezzi, Marc Olivier Heuschkel, Solomzi Makohliso

We present a novel OptoMEA platform that combines multisite electrical recording with local chemical stimulation. Applying UV light pulses through an array of optical fibres aligned to transparent indium-tin oxide electrodes of an MEA biochip leads to local compound uncaging (e.g. glutamate), thereby stimulating only the tissue/cells around the electrode vicinity. Experimental results obtained using the OptoMEA platform demonstrate its capability to uncage chemical compounds and to locally stimulate neuronal networks, thus providing a significant improvement in spatial control of chemical stimulation. It is expected that this methodology will be useful in facilitating studies of neuronal network systems, and may also find applications in drug screening.

2008

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