Interferometric optical fiber inclinometer with dynamic FBG based interrogation

C. R. da Silveira; J. P. Carvalho; P. A. S. Jorge; J. W. A. Costa; M. T. R. Giraldi; J. L. Santos; E. L. Carvalho Júnior; D. O. Figueiredo; O. Frazão

doi:10.1117/12.892186

26 July 2011 Interferometric optical fiber inclinometer with dynamic FBG based interrogation

C. R. da Silveira, J. P. Carvalho, P. A. S. Jorge, J. W. A. Costa, M. T. R. Giraldi, J. L. Santos, E. L. Carvalho Júnior, D. O. Figueiredo, O. Frazão

Author Affiliations +

Proceedings Volume 8001, International Conference on Applications of Optics and Photonics; 800145 (2011) https://doi.org/10.1117/12.892186
Event: International Conference on Applications of Optics and Photonics, 2011, Braga, Portugal

Abstract

The development of an interferometric optical fiber inclinometer is described in this paper. A weak tapered region is induced in a standard single mode fiber in the vicinity of the cleaved fiber tip, using a standard fusion splicer. In this situation an in-fiber Michelson interferometer is constructed that is sensitive to curvature applied in the tapered region. It is shown that depending on the angular range, fringe visibility and/or peak position depend strongly on the applied curvature enabling low cost dielectric inclinometer to be setup that is suitable for high voltage applications. It is presented an analysis of the sensor response by means of experimental measurements and manipulation of these experimental data through computational simulations. The results coming from the numerical simulations indicate a good performance of the sensor within range of angular variation between 3 and 6 degrees and 10 and 14 degrees. A low cost strategy to interrogate the response of sensor using electrically modulated fiber Bragg gratings, a photodetector and frequency analysis is described. The results presented by this electric interrogation technique show a good sensitivity in the range 3.5 to 5.5 degrees.

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C. R. da Silveira, J. P. Carvalho, P. A. S. Jorge, J. W. A. Costa, M. T. R. Giraldi, J. L. Santos, E. L. Carvalho Júnior, D. O. Figueiredo, and O. Frazão "Interferometric optical fiber inclinometer with dynamic FBG based interrogation", Proc. SPIE 8001, International Conference on Applications of Optics and Photonics, 800145 (26 July 2011); https://doi.org/10.1117/12.892186

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