Temperature-dependent strain and temperature sensitivities of fused silica single mode fiber sensors with pulse pre-pump Brillouin optical time domain analysis

Yi Bao, Genda Chen

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

This paper reports a distributed temperature and strain sensor based on pulse pre-pump Brillouin optical time domain analysis. An uncoated, telecom-grade fused silica single-mode fiber as a distributed sensor was calibrated for its sensitivity coefficients under various strains and temperatures up to 800 °C. The Brillouin frequency of fiber samples changed nonlinearly with temperature and linearly with strain. The temperature sensitivity decreased from 1.113 to 0.830 MHz /°C in the range of 22-800 °C. The strain sensitivity was reduced from 0.054 to 0.042 MHz /μϵ as the temperature increased from 22 to 700 °C and became unstable at higher temperatures due to creep effect. The strain measurement range was reduced from 19 100 to 6000 μϵ in the temperature range of 22-800 °C due to fused silica's degradation. The calibrated fiber optic sensor demonstrated adequate accuracy and precision for strain and temperature measurements and stable performance in heating-cooling cycles. It was validated in an application setting.

Original languageEnglish
Article number065101
JournalMeasurement Science and Technology
Volume27
Issue number6
DOIs
StatePublished - 19 Apr 2016

Keywords

  • PPP-BOTDA
  • distributed fiber optic sensor
  • high temperature
  • strain and temperature sensitivity coefficients
  • thermal expansion
  • thermo-mechanical interaction

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