TY - JOUR
T1 - Long-term strain response of polymer optical fiber FBG sensors
AU - Bundalo, Ivan-Lazar
AU - Nielsen, Kristian
AU - Woyessa, Getinet
AU - Bang, Ole
PY - 2017
Y1 - 2017
N2 - We report on the viscoelastic response of PMMA microstructured polymer optical fibers (mPOFs) when exposed to long periods of strain and relaxation, with the strain period ranging from 0.5 min to 50 min. The behavior of the fibers was monitored by inscribing a fiber Bragg grating (FBG) in them and tracking the reflection peak. We demonstrate that the fiber, when relaxing from strains of up to 0.9%, has a two-phase recovery: initially linear (elastic driven) and subsequently nonlinear (viscoelastic driven) contraction. The linear (elastic) relaxation wavelength range depends both on the strain level and on the strain duration. For short strain durations, this wavelength range stays the same, but with increasing strain duration, it decreases, which will influence the operation range of mPOF and POFbased FBG sensors.
AB - We report on the viscoelastic response of PMMA microstructured polymer optical fibers (mPOFs) when exposed to long periods of strain and relaxation, with the strain period ranging from 0.5 min to 50 min. The behavior of the fibers was monitored by inscribing a fiber Bragg grating (FBG) in them and tracking the reflection peak. We demonstrate that the fiber, when relaxing from strains of up to 0.9%, has a two-phase recovery: initially linear (elastic driven) and subsequently nonlinear (viscoelastic driven) contraction. The linear (elastic) relaxation wavelength range depends both on the strain level and on the strain duration. For short strain durations, this wavelength range stays the same, but with increasing strain duration, it decreases, which will influence the operation range of mPOF and POFbased FBG sensors.
U2 - 10.1364/OME.7.000967
DO - 10.1364/OME.7.000967
M3 - Journal article
SN - 2159-3930
VL - 7
SP - 967
EP - 976
JO - Optical Materials Express
JF - Optical Materials Express
IS - 3
ER -