Optical fiber probes for fluorescence based oxygen sensing

P. A.S. Jorge, P. Caldas, C. C. Rosa, A. G. Oliva, J. L. Santos

Research output: Contribution to journalArticlepeer-review

91 Citations (Scopus)


An optical fiber sensing system, for monitoring oxygen aiming in vivo nuclear magnetic resonance (NMR) applications is presented. Oxygen detection is based on the dynamic quenching of the fluorescence of a ruthenium complex trapped in the porous structure of a sol-gel silica film. Oxygen concentration is determined by phase-modulation fluorometry. Preliminary results concerning the characterization of doped sol-gel thin films deposited by dip coating in glass slides and in optical fiber probes are presented. Four different probe configurations are tested and compared. Best results are obtained with a fiber taper configuration which shows reproducibility and best excitation efficiency. This structure is fully characterized and some considerations regarding optimal fiber optical sensing probes for O2 detection are addressed.

Original languageEnglish
Pages (from-to)290-299
Number of pages10
JournalSensors and Actuators B: Chemical
Issue number1-2
Publication statusPublished - 29 Sept 2004


  • Optical fiber
  • Oxygen sensor
  • Phase fluorometry


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