Packaged Optical Sensors Based on Regenerated Fiber Bragg Gratings for High Temperature Applications

We report on temperature sensors based on regenerated fiber Bragg gratings (RFBGs) for measurements up to 1100°C. The annealing process required to regenerate such gratings makes the optical fiber too delicate, thus making an adequate packaging necessary. Prior to the grating regeneration the optical fiber is protected with a ceramic tube which in turn is shielded with a thick metal casing. We have performed a thorough characterization of the thermo-optical response of both packaged and unpackaged RFBG sensors placing especial attention on possible residual hysteresis after several temperature cycling tests. The response and recovery times of packaged sensors were found to be, respectively, ~ 9 s and ~ 22 s. © 2006 IEEE.This work was supported in part by the Ministerio de Ciencia e Innovacion, Spain, through projects TEC2007-68065-C03-01, SO-PROMAC No. P41/08, in part by the "Ramon y Cajal" Program, and in part by the European COST Action 299 FIDES. This is an expanded paper from the 4th European Workshop on Optical Fiber Sensors, Porto, Portugal, September 8-10, 2010. Date of publication March 03, 2011; date of current version November 29, 2011. The associate editor coordinating the review of this manuscript and approving it for publication was Dr. William MacPherson.Barrera Vilar, D.; Finazzi, V.; Villatoro, J.; Sales Maicas, S.; Pruneri, V. (2012). Packaged Optical Sensors Based on Regenerated Fiber Bragg Gratings for High Temperature Applications. IEEE Sensors Journal. 12(1):107-112. https://doi.org/10.1109/JSEN.2011.212225410711212