A technique to enhance the spatial resolution of typical fiber Bragg grating–based strain gauges has been experimentally verified in this study. Just analyzing the intensity of the reflection spectrum of a sampled fiber Bragg grating, its inner deformation profile has been obtained with a spatial resolution of L<1mm. The proposed method employs a synthesis algorithm to retrieve the longitudinal axis strain profile of a sampled fiber Bragg grating glued to an asymmetric plate. The achieved experimental results have been compared to the mechanical simulations of the employed plate, exhibiting a good response even without compensating the residual stress provoked during the installation process.
Lopez-HigueraJM. Handbook of optical fibre sensing technology. UK: John Wiley & Sons Inc., 2002.
2.
RaoYJJacksonDAZhangL. Strain sensing of modern composite materials with a spatial/wavelength-division multiplexed fiber grating network. Opt Lett1996; 21(9): 683–685.
3.
Lopez-HigueraJMRodriguez CoboLQuintela InceraA. Fiber optic sensors in structural health monitoring. J Lightwave Technol2011; 29(4): 587–608.
4.
AnsariF. State-of-the-art in the applications of fiber-optic sensors to cementitious composites. Cement Concrete Comp1997; 19(1): 3–19.
5.
ReadIJFootePD. Sea and flight trials of optical fibre Bragg grating strain sensing systems. Smar Mat Struct2001; 10(5): 1085.
6.
CarvalhoLSilvaJCCNogueiraRN. Application of Bragg grating sensors in dental biomechanics. J Strain Anal Eng2006; 41(6): 411–416.
7.
AzanaJMurielMA. Reconstructing arbitrary strain distributions within fiber gratings by time-frequency signal analysis. Opt Lett2000; 25(10): 698–700.
8.
ChapeleauXCasariPLeducD. Determination of strain distribution and temperature gradient profiles from phase measurements of embedded fibre Bragg gratings. J Opt A: Pure Appl Op2006; 8: 775.
9.
LeBlancMHuangSYOhnM. Distributed strain measurement based on a fiber Bragg grating and its reflection spectrum analysis. Opt Lett1996; 21(17): 1405–1407.
10.
CasagrandeFCrespiPGrassiAM. From the reflected spectrum to the properties of a fiber Bragg grating: a genetic algorithm approach with application to distributed strain sensing. Appl Optics2002; 41(25): 5238–5244.
11.
ChengCCLoYLLiWY. Estimations of fiber Bragg grating parameters and strain gauge factor using optical spectrum and strain distribution information. Appl Optics2007; 46(21): 4555–4562.
12.
EggletonBJKrugPAPoladianL. Long periodic superstructure Bragg gratings in optical fibres. Electron Lett1994; 30(19): 1620–1622.
KashyapR. Fiber Bragg gratings. San Diego, CA, USA: Academic Press, 1999.
16.
KennedyJEberhartR. Particle swarm optimization. In: Proceedings of the IEEE international conference on neural networks, Perth, WA, 27 November–1 December 1995, vol. 4, pp.1942–1948. New York: IEEE.
