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A kilometre-range distributed relative humidity sensor
CERN European Organization for Nuclear Research, Switzerland; Ecole Polytechnique Fédérale de Lausanne, Switzerland.
Ecole Polytechnique Fédérale de Lausanne, Switzerland.
Ecole Polytechnique Fédérale de Lausanne, Switzerland.
RISE - Research Institutes of Sweden, ICT, Acreo.
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2019 (English)In: Proceedings of SPIE - The International Society for Optical Engineering, SPIE , 2019Conference paper, Published paper (Refereed)
Abstract [en]

Fibre optics sensors have been identified as very good candidates for environmental monitoring inside the silicon detectors operated at CERN's Large Hadron Collider. In this study, we present the results from the first highly sensitive relative humidity distributed sensor with kilometres sensing range. The setup is a 70 cm spatial resolution phase-sensitive Optical Time Domain Reflectometry (OTDR) and is able to monitor fibre lengths up to 10 km. The coating effect is also evaluated, analysing different coating thicknesses, number of coating layers, different manufacturing and different materials. Relative humidity tests were performed at two different temperatures (25°C and 42°C). Polyimide coated fibres show in general a higher humidity sensitivity then a standard acrylate coated fibre, while acrylate fibres offer the fastest response and settling time. The system is able to resolve 0.1% RH and all tested fibres proved to be good candidates to be employed in a distributed relative humidity sensor. If the requirements are a fast time response and short settling time at room temperature, the standard acrylate coated fibres are the best candidates. However, if the requirements are high sensitivity and measurement stability at different temperatures, the polyimide-coated fibres offer advantages on several aspects.

Place, publisher, year, edition, pages
SPIE , 2019.
Keywords [en]
Acrylate, CERN, Coating, Continuous, Distributed, Fibre, Humidity, Phase-OTDR, Polyimide, Rayleigh, Sensing, Temperature, Atmospheric humidity, Fibers, Humidity sensors, Optical fibers, Polyimides, Silicon detectors, Thickness measurement, Coatings
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-40637DOI: 10.1117/12.2540007Scopus ID: 2-s2.0-85073353926ISBN: 9781510631236 (print)OAI: oai:DiVA.org:ri-40637DiVA, id: diva2:1370055
Conference
7th European Workshop on Optical Fibre Sensors, EWOFS 2019, 1 October 2019 through 4 October 2019
Available from: 2019-11-13 Created: 2019-11-13 Last updated: 2019-11-13Bibliographically approved

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CiteExportLink to record
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