Refractory lining health monitoring based on Raman optical time domain reflectometry

Lindblom, Magnus; Patzauer, Maximilian; Tow, Kenny Hey; Claesson, A.; Fogelberg, Oscar; Jonsäter, Toste; Warne, M. A.

doi:10.1117/12.2679296

Cited by 1 publication

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References 4 publications

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“…Polyimide coatings provide excellent long-term protection to fibres up to 300˚C in air for long period of time in harsh environment applications (shorter term to 350˚C) [1][2][3]. Yet, there are many use-cases where long-term, higher temperature monitoring of processes and assets using distributed fibre-optic sensing techniques would be beneficial [4][5][6][7]. In these specific cases, fibres with metal coatings such as aluminum or gold, which can withstand higher temperatures, are sometimes used.…”

Section: Introductionmentioning

confidence: 99%

Graphene-material based nanocomposite-coated optical fibres: a multi-functional optical fibre for improved distributed sensing performance in harsh environment

Tow,

Alomari,

Pereira

et al. 2024

J. Lightwave Technol.

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The optical fibre coating is essential to ensure high performance and reliability of the optical fibre. Out of all polymer-coated fibres, polyimide coatings provide the highest temperature rating, typically rated for use in optical fibre sensing applications at 300˚C (in air), with short excursion to 350˚C. In this communication, we assess whether the inclusion of graphenebased nanoparticles, such as graphene and graphene oxide, in a polyimide coating can enhance the durability of optical fibres at high temperatures. Draw tower fabrication of optical fibres with nanocomposite polymer coating is described. Tensile strength tests, performed on aged nanocomposite-coated optical fibres, are used as an indication of their performance at harsh conditions. The results are validated and quantified by distributed temperature and humidity sensing tests performed using these fibres. The results show that this novel class of fibre is more robust to high-temperature ageing and moisture-induced strain than standard polyimide-coated fibres, when used for distributed sensing. The electrical conductivity of the nanocomposite coating is also used in a multi-sensing approach, together with distributed optical fibre sensing, to measure temperature in a reliable way using the same optical fibre.

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