Displacement fiber Bragg grating sensor with temperature compensation

Riccardo Falciai; Cosimo Trono

doi:10.1117/12.623639

23 May 2005 Displacement fiber Bragg grating sensor with temperature compensation

Riccardo Falciai, Cosimo Trono

Proceedings Volume 5855, 17th International Conference on Optical Fibre Sensors; (2005) https://doi.org/10.1117/12.623639
Event: 17th International Conference on Optical Fibre Sensors, 2005, Bruges, Belgium

Abstract

In this work a temperature-compensated configuration for extending the working range of fiber Bragg grating (FBG) strain sensors has been proposed. This technique consists of the application of two FBGs to the opposite surfaces of a straight elastic beam which was bent in a horizontal direction. Pushing nearer of beam ends produced the beam curvature variation measured by means of the two FBG wavelength difference The difference of the two FBGs wavelengths depends on the beam curvature, while the mean value is taken in order to compensate for the temperature effects. The sensitivity of the system was obtained for different beam lengths. Decreasing the beam length increases the sensitivity, but decreases the working range. The sensor proposed is less fragile than the bare fiber and constitutes a displacement sensor particularly suited for applications to breaks or separate elements of structures where it is impossible to affix the bare fiber.

Citation Download Citation

Riccardo Falciai and Cosimo Trono "Displacement fiber Bragg grating sensor with temperature compensation", Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); https://doi.org/10.1117/12.623639

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