A kilometre-range distributed relative humidity sensor

Tiago F. P. Neves; Li Zhang; Fan Yang; Kenny H. Tow; Paolo Petagna; Luc Thévenaz

doi:10.1117/12.2540007

28 August 2019 A kilometre-range distributed relative humidity sensor

Tiago F. P. Neves, Li Zhang, Fan Yang, Kenny H. Tow, Paolo Petagna, Luc Thévenaz

Proceedings Volume 11199, Seventh European Workshop on Optical Fibre Sensors; 1119922 (2019) https://doi.org/10.1117/12.2540007
Event: Seventh European Workshop on Optical Fibre Sensors, 2019, Limassol, Cyprus

Abstract

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.

Citation Download Citation

Tiago F. P. Neves, Li Zhang, Fan Yang, Kenny H. Tow, Paolo Petagna, and Luc Thévenaz "A kilometre-range distributed relative humidity sensor", Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 1119922 (28 August 2019); https://doi.org/10.1117/12.2540007

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