In-fibre fabry-perot cavity sensor for high temperature applications

Jinesh Mathew, Oliver Schneller, Dimitrios Polyzos, Dirk Havermann, Richard Carter, William Neil MacPherson, Duncan Paul Hand, Robert Raimund Maier

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The fabrication, characterization and encapsulation of a fiber optic temperature sensor based upon a micro Fabry–Perot (F-P) cavity is presented. The F-P cavity is formed between a reflective in-fiber metallic splice and the air-fiber boundary at the end of the sensor. A change in temperature modifies the optical cavity length, and this is observed as a change in the reflected interference spectrum. The sensor has been demonstrated for high-temperature measurement up to 1100 °C. The stability of the sensor system is ∼10 °C over a period exceeding 300 h at 1100 °C. Furthermore, a sealed capillary is used as a protective enclosure.
Original languageEnglish
Pages (from-to)2419-2425
Number of pages7
JournalJournal of Lightwave Technology
Issue number12
Early online date9 Feb 2015
Publication statusPublished - 2015


  • Fabry–Perot cavity
  • metal thin-film
  • optical fiber devices
  • optical fiber sensors
  • strain isolation
  • temperature sensors


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