Strain monitoring in power cables of offshore wind energy plants with femtosecond laser inscribed fibre Bragg gratings

Jörg Burgmeier; Peter Funken; Wolfgang Schade

doi:10.1117/12.886061

18 May 2011 Strain monitoring in power cables of offshore wind energy plants with femtosecond laser inscribed fibre Bragg gratings

Jörg Burgmeier, Peter Funken, Wolfgang Schade

Author Affiliations +

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 775382 (2011) https://doi.org/10.1117/12.886061
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

Abstract

A fibre Bragg grating sensor system used for monitoring of strain being effective on the power cable of an offshore wind turbine is presented. The Bragg grating structure was inscribed in coated non-photosensitive standard telecommunication fibres using an infrared femtosecond laser and the point-by-point writing technique. Due to the presence of the protective coating of the fibre, the mechanical stability of the resultant sensor device is better than that of a sensor consisting of a bare fibre. A system containing this sensing element was successfully installed and tested in an offshore wind turbine prototype (REpower 6M) in February 2010, near Ellhöft (Germany). The fabrication process of the fibre Bragg gratings, a comparison between the sensor signal and a commonly used strain gauge and measurement results of the online monitoring are presented.

Citation Download Citation

Jörg Burgmeier, Peter Funken, and Wolfgang Schade "Strain monitoring in power cables of offshore wind energy plants with femtosecond laser inscribed fibre Bragg gratings", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 775382 (18 May 2011); https://doi.org/10.1117/12.886061

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