Metal-Coated Fibers

Bogatyrev, V. A.; Semjonov, S. L.

doi:10.1016/b978-012369406-5/50017-5

Cited by 11 publications

(8 citation statements)

References 19 publications

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“…The transition between Region 1 and 2 was determined to start below 200 • C during cooling. This is in good agreement with results shown in [16] for the aluminum coating, whereas it is about 50 • C higher for the gold coating. The reduction of additional loss during heating was observed to be at a higher temperature as the loss increase during cooling.…”

Section: Attenuation Changes During Temperature Cyclingsupporting

confidence: 92%

“…For high temperature applications (< 300 • C), polyimide coated fibres are widely used in wellbore applications. Higher temperatures can be measured with metal coated fibres, but it is well known that these fibres have high attenuation values at low temperatures [16]. A further drawback of aluminum coated fibres is additional hydroxyl absorption that can be observed at temperatures of 400 • C [17].…”

Section: Introductionmentioning

confidence: 99%

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Temperature-dependent characterization of optical fibres for distributed temperature sensing in hot geothermal wells

Reinsch

Henninges

2010

Meas. Sci. Technol.

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This study was performed in order to select a proper fibre for the application of a distributed temperature sensing system within a hot geothermal well in Iceland. Commercially available high temperature graded index fibres have been tested under in-situ temperature conditions. Experiments have been performed with four different polyimide coated fibres, a fibre with an aluminum coating and a fibre with a gold coating. To select a fibre, the relationship between attenuation, temperature, and time has been analyzed together with SEM micrographs. On the basis of these experiments, polyimide fibres have been chosen for utilisation. Further tests in ambient and inert atmosphere have been conducted with two polyimide coated fibres to set an operating temperature limit for these fibres. SEM micrographs, together with coating colour changes have been used to characterize the high temperature performance of the fibres. A novel cable design has been developed, a deployment strategy has been worked out and a suitable well for deployment has been selected.PACS numbers: 42.81. Cn, 93.85.Fg In press: Meas. Sci. Technol.

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Section: Attenuation Changes During Temperature Cyclingsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Temperature-dependent characterization of optical fibres for distributed temperature sensing in hot geothermal wells

Reinsch

Henninges

2010

Meas. Sci. Technol.

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“…This means that the anti-radiation efficiency of these fibers depends on the time interval between treatment and irradiation, and that their use should be limited to applications requiring only short-term stability [147][148][149]. To increase the useful life of H 2 -loaded fibers, hermetic coatings made of carbon or metal have been developed to prevent the diffusion of hydrogen out of the fiber [150,151]. This technique was shown to improve the resistance to prolonged irradiation but the strict conditions required to deposit the coating material on the surface of silica still prevent its use in common devices [19].…”

Section: Photodarkening In Optical Fibersmentioning

confidence: 99%

Intrinsic Point Defects in Silica for Fiber Optics Applications

2021

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Due to its unique properties, amorphous silicon dioxide (a-SiO2) or silica is a key material in many technological fields, such as high-power laser systems, telecommunications, and fiber optics. In recent years, major efforts have been made in the development of highly transparent glasses, able to resist ionizing and non-ionizing radiation. However the widespread application of many silica-based technologies, particularly silica optical fibers, is still limited by the radiation-induced formation of point defects, which decrease their durability and transmission efficiency. Although this aspect has been widely investigated, the optical properties of certain defects and the correlation between their formation dynamics and the structure of the pristine glass remains an open issue. For this reason, it is of paramount importance to gain a deeper understanding of the structure–reactivity relationship in a-SiO2 for the prediction of the optical properties of a glass based on its manufacturing parameters, and the realization of more efficient devices. To this end, we here report on the state of the most important intrinsic point defects in pure silica, with a particular emphasis on their main spectroscopic features, their atomic structure, and the effects of their presence on the transmission properties of optical fibers.

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“…Considering the issues mentioned above, using bare optical fibers is not a recommended choice for high temperature applications. This is why metal-coated fibers are used for such conditions instead [ 22 ]. The deposition of metals onto the fiber is usually performed by an adaptation of the Ohno continuous casting process [ 22 , 23 ].…”

Section: Degradation Of Optical Fibers At High Temperaturementioning

confidence: 99%

“…This is why metal-coated fibers are used for such conditions instead [ 22 ]. The deposition of metals onto the fiber is usually performed by an adaptation of the Ohno continuous casting process [ 22 , 23 ]. This process is based on drawing the fiber through a liquid metal near its melting point, which enables molten metal to solidify on the fiber surface.…”

Section: Degradation Of Optical Fibers At High Temperaturementioning

confidence: 99%

New Methods of Enhancing the Thermal Durability of Silica Optical Fibers

Wysokiński¹,

Stańczyk²,

Gibala³

et al. 2014

Materials

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Microstructured optical fibers can be precisely tailored for many different applications, out of which sensing has been found to be particularly interesting. However, placing silica optical fiber sensors in harsh environments results in their quick destruction as a result of the hydrolysis process. In this paper, the degradation mechanism of bare and metal-coated optical fibers at high temperatures under longitudinal strain has been determined by detailed analysis of the thermal behavior of silica and metals, like copper and nickel. We furthermore propose a novel method of enhancing the lifetime of optical fibers by the deposition of electroless nickel-phosphorous alloy in a low-temperature chemical process. The best results were obtained for a coating comprising an inner layer of copper and outer layer of low phosphorous nickel. Lifetime values obtained during the annealing experiments were extrapolated to other temperatures by a dedicated model elaborated by the authors. The estimated copper-coated optical fiber lifetime under cycled longitudinal strain reached 31 h at 450 °C.

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Metal-Coated Fibers

Cited by 11 publications

References 19 publications

Temperature-dependent characterization of optical fibres for distributed temperature sensing in hot geothermal wells

Temperature-dependent characterization of optical fibres for distributed temperature sensing in hot geothermal wells

Intrinsic Point Defects in Silica for Fiber Optics Applications

New Methods of Enhancing the Thermal Durability of Silica Optical Fibers

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