Enhanced pressure and thermal sensitivity of polymer optical fiber Bragg grating sensors

Getinet Woyessa*, Jens K.M. Pedersen, Kristian Nielsen, Ole Bang

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

One of the features of reliable polymer optical fiber (POF) Bragg grating sensors is high sensitivity. Towards this, we have investigated a method to enhance the intrinsic pressure and thermal sensitivity of fiber Bragg grating (FBG) sensors inscribed in POFs. By pre-straining the FBG we demonstrated that: (1) the pressure induced mechanical contraction of the fiber can be suppressed, resulting in an increase in the pressure sensitivity of the grating by a factor of 5; and (2) the temperature induced strain can be suppressed, resulting in an increase in the thermal response by more than a factor of 10. The pressure sensitivity enhancement was found to be independent of the amount of pre-strain for levels ranging from 0.07 to 0.33%. The enhancement of the temperature sensitivity was also found to be independent of the amount of pre-strain, but only for temperatures up to when the thermal expansion cancels the pre-strain.

Original languageEnglish
Article number106357
JournalOptics and Laser Technology
Volume130
Number of pages5
ISSN0030-3992
DOIs
Publication statusPublished - Oct 2020

Keywords

  • Fiber Bragg grating
  • Fiber optic sensors
  • Polymer waveguide
  • Sensitivity

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