Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 33, Issue 12, Pages 2419-2425Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2015.2397936
Keywords
Fabry-Perot cavity; metal thin-film; optical fiber devices; optical fiber sensors; strain isolation; temperature sensors
Funding
- EPSRC
- European Union [310279]
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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 degrees C. The stability of the sensor system is similar to 10 degrees C over a period exceeding 300 h at 1100 degrees C. Furthermore, a sealed capillary is used as a protective enclosure.
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