Strain optical fiber sensor with modified sensitivity based on the vernier effect

D. Jauregui-Vazquez, J. P. Korterik, H. L. Offerhaus, R. Rojas-Laguna, J. A. Alvarez-Chavez*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

An optical fiber strain sensor with adjustable sensitivity is proposed and demonstrated. The strain sensing setup employs a fiber optic Michelson interferometer (sensing element) and an extrinsic Fabry–Perot interferometer, in which both structures excited the Vernier effect. By adjusting the cavity length of the extrinsic Fabry–Perot interferometer, it is possible to control the M-factor. The set-up offers both sensitivity enhancement and magnification mode, where the maximal sensitivity is 4.38 pm/με (M-factor = 2.3). This design improves the sensor performance and its implementation is not intricate.

Original languageEnglish
JournalInstrumentation Science and Technology
DOIs
Publication statusE-pub ahead of print/First online - 30 Nov 2022

Keywords

  • Fabry–Perot interferometer
  • Michelson interferometer
  • strain fiber optic sensor
  • Vernier effect
  • UT-Hybrid-D

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