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.
|Title of host publication||Proceedings of SPIE|
|Number of pages||4|
|Publisher||SPIE - International Society for Optical Engineering|
|Publication status||Published - 2015|
|Event||24th International Conference on Optical Fibre Sensors - Curitiba , Brazil|
Duration: 28 Sep 2015 → 2 Oct 2015
|Conference||24th International Conference on Optical Fibre Sensors|
|Period||28/09/2015 → 02/10/2015|
|Series||Proceedings of the SPIE - The International Society for Optical Engineering|
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Bundalo, I-L., Nielsen, K., Woyessa, G., & Bang, O. (2015). Long term strain behavior of PMMA based polymer optical fibers. In Proceedings of SPIE (Vol. 9634). [96347Y] SPIE - International Society for Optical Engineering. Proceedings of the SPIE - The International Society for Optical Engineering, Vol.. 9634 https://doi.org/10.1117/12.2195267