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LED-based fibre optic oxygen sensor using sol-gel coating

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4 Author(s)
B. D. M. Craith ; Sch. of Phys. Sci., Dublin City Univ., Ireland ; G. O'Keeffe ; C. McDonagh ; A. K. McEvoy

An intrinsic evanescent wave fibre optic sensor for oxygen is reported. The sensor is based on the quenching of fluorescence from a ruthenium complex trapped in the cage-like structure of a sol-gel-derived porous film on a de-clad section of multimode optical fibre. The sensor exhibits excellent performance using blue LED excitation and silicon photodiode detection, and establishes the viability of low-cost portable sensor devices based on the sol-gel process. Gas phase measurement data over the range 0-100% oxygen exhibit high signal-to-noise ratio (~150), good repeatability and short response time (<5 s)

Published in:

Electronics Letters  (Volume:30 ,  Issue: 11 )