Sensitivity analysis on strain sensor based on Fabry-Perot interferometer with intensity interrogation

Fan Fan, Jianlin Zhao, Xixing Wen, Biqiang Jiang

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Based on the principle of intensity interrogation, the sensitivity of the fiber Bragg grating Fabry-Perot interferometer (FBG-FPI) strain sensor is analyzed and the influences of the grating length, the effective refractive index change and the cavity length of FBG-FPI resonator on the maximum strain sensitivity are also discussed. The strain sensitivities of two structures which FBG-FPI fibers are affixed to the transducer by different ways are also considered. The comparison between FBG-FPI and single fiber Bragg grating as well as traditional fiber Fabry-Perot interferometer with intensity interrogation is also presented. It is shown that the minimum theoretically detectable strain of the FBG-FPI strain sensors with intensity interrogation should be on the order of 10-12. The corresponding experiments, in which a periodic strain stimulated by a piezoelectric (PZT) affixed to the FBG-FPI, show that such a FBG-FPI strain sensor can be used to detect weak alternating strain signal and it has good linear character after the non-linear correction.

Original languageEnglish
Pages (from-to)1525-1531
Number of pages7
JournalZhongguo Jiguang/Chinese Journal of Lasers
Volume37
Issue number6
DOIs
StatePublished - Jun 2010

Keywords

  • Fabry-Pérot interferometer
  • Fiber Bragg grating
  • Fiber sensor
  • Sensors
  • Strain sensitivity

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