Optical temperature measurement configuration for fluorescence based oxygen sensors

Pedro Alberto Da Silva Jorge, Paulo Caldas, Carla Carmelo Rosa, Abel Martin Gonzalez Oliva, M. B. Marques, José Luís Campos Oliveira Santos

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)


An optical fiber sensor for the measurement of oxygen in gaseous environments, which is based on the quenching of the fluorescence of a ruthenium complex, is presented. The sensing chemistry is immobilized in a sol-gel based solid matrix that is coated on a tapered optical fiber probe. Oxygen measurement is performed both by phase and fluorescence intensity spectroscopy. Experimental results show that the fluorescence intensity and the lifetime depend both on oxygen and temperature. A scheme for simultaneous determination of the temperature and the oxygen concentration is proposed. Temperature measurement is performed using the excitation radiation and an absorption long pass filter. Preliminary results are presented which show a temperature measurement independent of oxygen and of optical power level.

Original languageEnglish
Pages (from-to)279-282
Number of pages4
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 26 Oct 2004
EventSecond European Workshop on Optical Fibre Sensors, EWOFS'04 - Santander, Spain
Duration: 9 Jun 200411 Jun 2004


  • Fluorescence quenching
  • Optical fiber
  • Oxygen sensor
  • Simultaneous temperature measurement


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