Long term strain behavior of PMMA based polymer optical fibers

Ivan-Lazar Bundalo, Kristian Nielsen, Getinet Woyessa, Ole Bang

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We are reporting on the viscoelasticity of PMMA based Fiber Bragg Grating (FBG) strain sensors when exposed to repeated sequences of long term strain and relaxation with various duty-cycles. In terms of the FBG wavelength and how it follows the strain cycle, we have shown that in the small strain regime (up to 1%) an elastic-dominated fast relaxing range, which is followed by a mainly viscous relaxation, depends both on the strain level and on the strain duration. For a small ratio of the strain-relax durations, this fast relaxation range stays almost the same. However, with increasing strain duration, for the same relaxation time, this range will be shortened, which might influence the sensing capabilities of the fiber sensor.
Original languageEnglish
Title of host publicationProceedings of SPIE
Number of pages4
PublisherSPIE - International Society for Optical Engineering
Publication date2015
Article number96347Y
Publication statusPublished - 2015
Event24th International Conference on Optical Fibre Sensors - Curitiba , Brazil
Duration: 28 Sep 20152 Oct 2015


Conference24th International Conference on Optical Fibre Sensors
SeriesProceedings of the SPIE - The International Society for Optical Engineering

Bibliographical note

Copyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.


  • Viscoelasticity
  • pmma
  • FBG
  • Strain
  • Sensor


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