Fiber-optic temperature sensor using a Fabry-Pérot cavity filled with gas of variable pressure

Yujie Lu, Ming Han, Jiajun Tian

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


We report a high-temperature fiber-optic sensor based on measuring the spectral fringes of a Fabry-Pérot (FP) cavity on a microstructure fiber (MF) when the gas pressure in the cavity is varied through the holes in the MF. Theoretical analysis shows that the absolute temperature can be deduced from the slope of the spectral shift versus pressure curve, which requires no calibration and is insensitive to the FP cavity length variations. For demonstration, we fabricated a miniature sensor whose FP cavity is formed by sandwiching a fuse-silica tube between a side-hole MF and a solid-core fiber. Using the holes in the MF as gas channels, the pressure in the FP cavity is controlled. The sensor was tested for operation above 1000^{\circ}{\rm C}. Strain-insensitive temperature measurement was demonstrated at ambient temperature for a strain range up to 3600 \mu\varepsilon.

Original languageEnglish (US)
Article number6737212
Pages (from-to)757-760
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number8
StatePublished - Apr 15 2014


  • Fabry-Pérot interferometer
  • Fiber-optic sensors
  • Microstructure fiber
  • Temperature measurement

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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