Fiber-optic temperature sensor using dual fabry-perot cavities filled with gas of different pressure

Yujie Lu, Ming Han

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


We present a fiber-optic temperature sensor based on dual Fabry-Perot cavities formed at the end of a multicore fiber and filled will with gas of differential pressure. Making use of the unique relationship of the refractive index of a gas to its pressure and absolute temperature, a theoretical model is developed to extract the absolute temperature from the differential shifts of the spectral fringes from the two cavities. The demodulation of the sensor is inherently insensitive to the strain applied on the sensor. In addition, the sensor has excellent stability due to the use of gas, which has stable optical properties even at elevated temperature, as the sensing element. Such a sensor was fabricated with dual cavities filled with air of a differential pressure of 1000 psi and the sensor is tested for measurement of absolute temperatures up to 900 K (627 °C). The sensor performance in terms of accuracy, resolution, cross-sensitivity to strain, and stability are studied.

Original languageEnglish (US)
Pages (from-to)229-234
Number of pages6
JournalSensors and Actuators, A: Physical
StatePublished - Jul 1 2017


  • Fabry-Perot interferometer
  • Optical fiber sensor
  • Temperature measurement

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering


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