Phase-shifted helical long-period grating-based temperatureinsensitive optical fiber twist sensors

Ran Gao, Yinian Zhu, Sridhar Krishnaswamy, Yi Jiang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

In smart structure monitoring, twist angle is one of the most critical mechanical parameters for infrastructure deterioration. A compact temperature-insensitive optical fiber twist sensor based on multi-phase-shifted helical long period fiber grating has been proposed and experimentally demonstrated in this paper. A multi-phase-shifted helical long period fiber grating is fabricated with a multi-period rotation technology. A π / 2 and a 3π / 2 phase shift is introduced in the helical long period fiber grating by changing the period. The helical pitch can be effectively changed with a different twist rate, which is measured by calculating the wavelength difference between two phase shift peaks. Although the wavelength of the phase shift peak also shifts with a change of the temperature, the wavelength difference between two phase shift peaks is constant due to two fixed phase shifts in the helical long period fiber grating, which is extremely insensitive to temperature change for the multi-phase-shifted helical long period fiber grating. The experimental results show that a sensitivity of up to 1.959 nm/(rad/m) is achieved.

Original languageEnglish (US)
Title of host publicationHealth Monitoring of Structural and Biological Systems 2015
PublisherSPIE
Volume9438
ISBN (Electronic)9781628415414
DOIs
StatePublished - Jan 1 2015
EventHealth Monitoring of Structural and Biological Systems 2015 - San Diego, United States
Duration: Mar 9 2015Mar 12 2015

Other

OtherHealth Monitoring of Structural and Biological Systems 2015
CountryUnited States
CitySan Diego
Period3/9/153/12/15

Keywords

  • All-optical devices
  • Fiber optics sensors
  • Gratings

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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