New method for strength improvement of silica optical fibers

Abdi, R. El; Rujinsky, A.; Borda, Claudia; Severin, Irina; Poulain, Marcel

doi:10.1016/j.optlaseng.2007.10.005

Cited by 12 publications

(3 citation statements)

References 4 publications

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“…Usually, at low strain rates bi or multi modal Weibull distribution may be noticed, meaning that both extrinsic and intrinsic microcracks characterize the fiber failure. At high strain rates, usually a mono-modal distribution is expected, with a high slope, meaning that failure is mainly due to a single defect population, the intrinsic microcracks [11].…”

Section: Resultsmentioning

confidence: 99%

Stress corrosion in silica optical fibers: Review of fatigue testing procedures

Severin

Borda

Dumitrache-Rujinski

et al. 2018

AIP Conference Proceedings

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The expected lifetime of optical fibers used either in telecommunication technologies or smart applications are closely related to the chemical reaction on the silica network. Due to the manufacturing processes or the handling procedures, the flaws spread on the fiber surface are inherently present. The aging mechanism is assumed to enlarge or to extend these flaws. Based on systematic experiments one may notice that water may induce a certain curing effect. Silica optical fibers have been aged in water; series of samples have been subjected to overlapped stretching or bending. Other series have been subjected to overlapped aging effect of microwaves and hot water. Finally, samples were submitted to dynamic tensile testing. The Weibull's diagram analysis shows mono or bimodal dispersions of flaws on the fiber surface, but the polymer coating appears vital for fiber lifetime. While humidity usually affects the fiber strength, the series of testing has revealed that in controlled conditions of chemical environment and controlled applied stress, fiber strength may be increased. A similar effect may be obtained by external factors such as microwaves or previous elongation, too.

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Section: Resultsmentioning

confidence: 99%

Stress corrosion in silica optical fibers: Review of fatigue testing procedures

Severin

Borda

Dumitrache-Rujinski

et al. 2018

AIP Conference Proceedings

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“…when taking into account equation (1) and considering that the tie-rods contribution to the vertical stiffness is mainly due to their pre-tension. For accuracy better than 0.1% of the stiffness, it can be seen from equation 4that the elastic modulus of the tie-rods should be 10 times smaller than that of the sample for a pre-strain of 3x10 -4 .…”

Section: The Containment Web and Its Effectsmentioning

confidence: 99%

“…The most widespread applications regard signal transmission (e.g. optical fibers [1,2]), force transmission (e.g. fibers in composites materials), protection and coating (e.g.…”

Section: Introductionmentioning

confidence: 99%

A New Testing Machine for the Dynamic Characterization of High Strength Low Damping Fiber Materials

et al. 2016

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This work describes a novel method for measuring the damping, the elastic modulus and the non-linear behavior of high strength low damping fiber materials such as para-aramids, silicon carbide (SiC) and carbon. The method is based on resonant response characterization of a spring-mass system excited by a sine-wave forcing term which is applied as a vertical force to the suspended mass. The damping is obtained from the measured resonance quality factor Q, the elasticity modulus is calculated from the resonance frequency, and the non-linear coefficient is obtained with the backbone approach from resonance profile variations as a function of the forcing term amplitude. It is argued that the method is very sensitive, to the point that a maximum excitation amplitude of the order of a few percent of resistance is sufficient to obtain an estimate of the non-linear coefficient. This claim is supported by experimental results. A testing machine is also discussed, which provides the necessary sensitivity at such small excitation amplitudes and the capability of evaluating very small damping values, as expected in high strength low damping fiber materials. The sensitivity is guaranteed by an optical position sensor with sub-micron resolution. To evaluate small damping values,

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The Fibre Resolved OpticAl and Near-Ultraviolet Czerny–Turner Imaging Spectropolarimeter (francis)

Jess,

Grant,

Bate

et al. 2023

Sol Phys

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The solar physics community is entering a golden era that is ripe with next-generation ground- and space-based facilities, advanced spectral inversion techniques, and realistic simulations that are becoming more computationally streamlined and efficient. With ever-increasing resolving power stemming from the newest observational telescopes, it becomes more challenging to obtain (near-)simultaneous measurements at high spatial, temporal and spectral resolutions, while operating at the diffraction limit of these new facilities. Hence, in recent years there has been increased interest in the capabilities integral field units (IFUs) offer towards obtaining the trifecta of high spatial, temporal and spectral resolutions contemporaneously. To date, IFUs developed for solar physics research have focused on mid-optical and infrared measurements. Here, we present an IFU prototype that has been designed for operation within the near-ultraviolet to mid-optical wavelength range, which enables key spectral lines (e.g., Ca ii H/K, H$\beta $ β , Sr ii, Na i D1/D2, etc.) to be studied, hence providing additional spectral coverage to the instrument suites developed to date. The IFU was constructed as a low-budget proof-of-concept for the upcoming $2\text{ m}$ 2 m class Indian National Large Solar Telescope and employs circular cross-section fibres to guide light into a Czerny–Turner configuration spectrograph, with the resulting spectra captured using a high quantum efficiency scientific CMOS camera. Mapping of each input fibre allows for the reconstruction of two-dimensional spectral images, with frame rates exceeding $20\text{ s}^{-1}$ 20 s − 1 possible while operating in a non-polarimetric configuration. Initial commissioning of the instrument was performed at the Dunn Solar Telescope, USA, during August 2022. The science verification data presented here highlights the suitability of fibre-fed IFUs operating at near-ultraviolet wavelengths for solar physics research. Importantly, the successful demonstration of this type of instrument paves the way for further technological developments to make a future variant suitable for upcoming ground-based and space-borne telescope facilities.

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New method for strength improvement of silica optical fibers

Cited by 12 publications

References 4 publications

Stress corrosion in silica optical fibers: Review of fatigue testing procedures

Stress corrosion in silica optical fibers: Review of fatigue testing procedures

A New Testing Machine for the Dynamic Characterization of High Strength Low Damping Fiber Materials

The Fibre Resolved OpticAl and Near-Ultraviolet Czerny–Turner Imaging Spectropolarimeter (francis)

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