Thermal and chemical treatment of polymer optical fiber Bragg grating sensors for enhanced mechanical sensitivity

A. Pospori*, C.A.F. Marques, D. Sáez-Rodríguez, K. Nielsen, O. Bang, D.J. Webb

*Corresponding author for this work

Research output: Contribution to journalArticle


An investigation of the thermal annealing effects on the strain, stress, and force sensitivities of polymer optical fiber Bragg grating sensors is performed. We demonstrate for the first time that the fiber annealing can enhance both stress and force sensitivities of Bragg grating sensors, with the possible cause being the molecular relaxation of the polymer when fiber is raised above the β-transition temperature. A simple, cost-effective, but well controlled method for fiber annealing is also presented in this work. In addition, the effects of chemical etching on the strain, stress, and force sensitivities have been investigated. Results show that fiber etching too can increase the force sensitivity, and it can also affect the strain and stress sensitivities of the Bragg grating sensors.

Original languageEnglish
Pages (from-to)68-74
Number of pages7
JournalOptical Fiber Technology
Early online date3 Mar 2017
Publication statusPublished - Jul 2017


Bibliographical note

© 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International


  • annealing
  • Bragg grating sensors
  • etching
  • mechanical sensitivity
  • POF

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