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Proceedings Paper

Embedded optical fibre strain gages for civil engineering: application to concrete monitoring
Author(s): Jean-Jacques Guerin; Michel Lequime; E. Toppani; M. Leygonie; D. Chauvel
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Paper Abstract

Intrinsic Optical Fibre Sensors (OFS), in which the fiber is the transducer, are now recognized as good candidates for distributed or quasi-distributed sensing applications. In the particular field of Civil Engineering, this concept will provide powerful means for global and real time monitoring of the structure integrity. Natural phenomena like earthquakes, wind, atmospheric pollutions but also more insidious internal effects such as chemical attack (Alkali problem) yield consequent internal damage for which the embedment of sensor arrays could be of great interest. In our application, the transducer scheme is based on a polarimetric approach in which the two modes of a high birefringent fiber are used to measure a phase shift proportional to the strain state. A quasi-distributed measurement is performed by using the low coherence 'White Light Interferometry' (WLI) to separate the information provided by a linear sensor arrangement. Along the fiber, the sensors are separate each other by intrinsic mode couplers [1,2]. In this paper, we report some experimental results of strain states obtained with concrete test structures. The sensors were embedded in the structure during its manufacturing and tests of elongation and compression were performed.

Paper Details

Date Published: 13 September 1994
PDF: 4 pages
Proc. SPIE 2361, Second European Conference on Smart Structures and Materials, (13 September 1994); doi: 10.1117/12.184831
Show Author Affiliations
Jean-Jacques Guerin, Bertin & Cie (France)
Michel Lequime, Bertin & Cie (France)
E. Toppani, EDF/Direction de l'Equipement/TEGG (France)
M. Leygonie, EDF/Direction de l'Equipement/TEGG (France)
D. Chauvel, EDF/Direction de l'Equipement/SEPTEN (France)

Published in SPIE Proceedings Vol. 2361:
Second European Conference on Smart Structures and Materials
Alaster McDonach; Peter T. Gardiner; Ron S. McEwen; Brian Culshaw, Editor(s)

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