Long-term stability testing of optical fibre Fabry-Perot temperature sensors

Dimitrios Polyzos*, Jinesh Mathew, William Neil MacPherson, Robert R. J. Maier

*Corresponding author for this work

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

5 Citations (Scopus)


Applications of fibre optic sensors at high temperatures have gained a huge interest recently, as they appeared to be suitable for temperature recording in harsh environments. In this paper, we are demonstrating two intrinsic Fabry-Perot ( F-P) fibre optic sensors for high temperature monitoring. The sensors are consisting of a 125 mu m diameter single mode fibre ( SMF28) and a 125 mu m diameter PCF ESM-12B pure fused silica fibre spliced to a SMF28, respectively. The result was a low finesse optical SMF-Cr-SMF, and SMF-Cr-PCF, sensor with cavity lengths varying from 50 mu m to 100 mu m. Both types of Fabry-Perot sensors were tested in a tube furnace over a temperature range from room temperature up to 1100 degrees C. Following a number of annealing cycles, between the above mentioned temperatures range, very good repeatability of the phase response was achieved. During the cycling process, thermal stress relief takes place which makes the sensors suitable for temperature testing at temperatures just in excess of 1000 degrees C. After initial cycling the sensors are subjected to long term stability tests. The phase response is stable, less than 4 degrees C, over a period of 5 days at a temperature of 1050 degrees C for both sensors. The temperature resolution is around 3 degrees C.

Original languageEnglish
Title of host publicationFiber Optic Sensors and Applications XIII
EditorsEric Udd, Gary Pickrell, Henry H. Du
Number of pages7
ISBN (Print)9781510600935
Publication statusPublished - 12 May 2016
EventConference on Fiber Optic Sensors and Applications XIII - Baltimore, United States
Duration: 18 Apr 201621 Apr 2016

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X


ConferenceConference on Fiber Optic Sensors and Applications XIII
Country/TerritoryUnited States


  • optical fibre sensors
  • high temperature
  • stability test
  • Fabry-Perot


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