New optical fibre coating meant for embedding distributed sensors into concrete

Sylvie Delepine-Lesoille; Erick Merliot; Marie Delaveau; Alain Courteville; Lionel Quetel

doi:10.1117/12.623600

23 May 2005 New optical fibre coating meant for embedding distributed sensors into concrete

Sylvie Delepine-Lesoille, Erick Merliot, Marie Delaveau, Alain Courteville, Lionel Quetel

Proceedings Volume 5855, 17th International Conference on Optical Fibre Sensors; (2005) https://doi.org/10.1117/12.623600
Event: 17th International Conference on Optical Fibre Sensors, 2005, Bruges, Belgium

Abstract

This paper reports on the design and realization of a new optical fibre sensor body meant for embedding distributed optical fibre sensors into concrete. We have carried out a finite element analysis which shows that the proposed wave-like sensor enables continuous bonding between optical fibre and concrete, symmetrical response in traction and compression whatever the contact conditions may be. The stiffness of the optical fibre can so be adapted to the concrete, which reduces strain concentrations and need for a theoretical calibration factor. Experimental validations are carried out, showing that despite its wave-shape, the proposed sensor body does not introduce any losses or strain that would result from fibre macrobendings. The process of realization is very cheap, thus dedicated to distributed sensors. We have realized optical fibre extensometers based on this technique and on low-coherence interferometry method for the measurements, including an original approach of thermal effect compensation. Preliminary results are very encouraging.

Citation Download Citation

Sylvie Delepine-Lesoille, Erick Merliot, Marie Delaveau, Alain Courteville, and Lionel Quetel "New optical fibre coating meant for embedding distributed sensors into concrete", Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); https://doi.org/10.1117/12.623600

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