Thermal Stability of Specialty Optical Fibers

Stolov, Andrei A.; Simoff, Debra A.; Li, Jie

doi:10.1109/jlt.2008.925698

Cited by 58 publications

(24 citation statements)

References 37 publications

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“…It is not unusual and has been reported by other authors elsewhere 12 . Using a range of temperatures to predict the end of life condition for thermally driven mechanisms is a well-established technique.…”

Section: Strengthsupporting

confidence: 74%

A polarisation maintaining fiber optimized for high temperature gyroscopes

et al. 2015

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Fiber optic gyroscopes (FOGs) are being used within increasingly severe environments, requiring operational temperatures in excess of the standard operating range for FOGs. Applications requiring these higher temperatures include: directional drilling of wells in oil and gas fields, space applications and military FOG applications. This paper will describe the relative merits of two high temperature acrylate coatings for an optical fiber designed for a FOG in such operating environments.Results for two high temperature acrylates are presented, tested in a 200m length of loose wound fiber, coiled and supported at 75mm diameter, in line with TIA/EIA- . It can be seen that both coating types give very good polarization extinction ratio (PER) performance at high temperature up to 180 o C, with better performance shown by one coating type on the low temperature side, since it does not harden to the same extent below 0 o C.The long term thermal exposure effects will be discussed and experimental results presented which include testing the PER performance over temperature both before and after an extended period of high temperature endurance. This will demonstrate the relative merits of different styles of coatings. From the PER performance, the h-parameter of the fiber can be calculated and hence the preferred coating type selected and recommended for the customer operating environment.

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Section: Strengthsupporting

confidence: 74%

A polarisation maintaining fiber optimized for high temperature gyroscopes

et al. 2015

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“…As described in Reinsch and Henninges (2010), irreversible attenuation changes in polyimide fibres are caused by curing, thermal, thermo-oxidative and moisture-induced degradation at elevated temperatures (Cella, 1996;Stolov et al, 2008). The coating material looses plasticity and mechanical stress onto the silica increases irreversibly.…”

Section: Second Dts Logging Campaign: Flow Testmentioning

confidence: 96%

Thermal, mechanical and chemical influences on the performance of optical fibres for distributed temperature sensing in a hot geothermal well

Reinsch

Henninges

Ásmundsson³

2013

Environ Earth Sci

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Structural wellbore integrity is an important issue for a sustainable provision of geothermal energy. Raman scattering based fiber optic distributed temperature sensing (DTS) can help to monitor the status of a well and therefore help to optimize expensive work-over activities. This study reports on the installation of a fibre optic cable in the cemented annulus behind the anchor casing in the high temperature geothermal well HE-53, Hellisheiði geothermal field, SW Iceland. Although the cable has been damaged during the installation, temperature data could be acquired during the entire length of installation down to 261.3 m. Temperature measurements were performed during the installation in spring 2009, during the onset of a flow test in summer 2009 and after a 8.5 month shut-in period in summer 2010. During the flow test, maximum temperatures of 230• C were measured after two weeks fluid production. Using optical time domain reflectometry (OTDR), attenuation measurements at 850 and 1300 nm enabled to identify mechanical, thermal, and chemical degradation along the optical fibre. The observed degradation led to erroneous temperature readings and limits, due to the optical budget of the DTS system, the accessible length of the fibre. The characteristics and the influence of the different degradation mechanisms on the accuracy of the DTS measurements are discussed and recommendations for an optimized installation are given.

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“…However, it is possible to coat PCFs with polymers that have higher operating temperature range. Some acrylates, silicone, or polyimide, for example, can resist temperatures up to 150 or 400°C [19]- [21], and gold coatings can withstand temperatures up to 800°C [22]. The protecting coating of the PCF does not affect the interfering modes neither the fringe contrast of the interferometer.…”

Section: Accurate Force Sensingmentioning

confidence: 99%

Photonic Crystal Fiber Interferometric Force Sensor

Villatoro

Minkovich

Zubía

2015

IEEE Photon. Technol. Lett.

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A compellingly simple force sensor based on a photonic crystal fiber (PCF) mode interferometer is presented. A mechanical piece with grooves is used to convert the external force in localized pressure on the sensitive part of the interferometer. The localized pressure on the PCF causes attenuation losses to the interfering modes and makes the interference pattern to shrink. The changes of the interference pattern are quantified by means of Fourier transformation. In the sensing architecture here proposed, temperature or power fluctuations of the light source do not affect the measurement.Index Terms-Photonic crystal fiber interferometers, optical fiber sensors, mode interferometers, force sensor, pressure sensor.

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Thermal Stability of Specialty Optical Fibers

Cited by 58 publications

References 37 publications

A polarisation maintaining fiber optimized for high temperature gyroscopes

A polarisation maintaining fiber optimized for high temperature gyroscopes

Thermal, mechanical and chemical influences on the performance of optical fibres for distributed temperature sensing in a hot geothermal well

Photonic Crystal Fiber Interferometric Force Sensor

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