Title :
LED-based fibre optic oxygen sensor using sol-gel coating
Author :
Craith, B. D Mac ; O´Keeffe, G. ; McDonagh, C. ; McEvoy, A.K.
Author_Institution :
Sch. of Phys. Sci., Dublin City Univ., Ireland
fDate :
5/26/1994 12:00:00 AM
Abstract :
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)
Keywords :
chemical variables measurement; fibre optic sensors; gas sensors; light emitting diodes; optical films; photodiodes; spectrochemical analysis; LED-based fibre optic oxygen sensor; blue LED excitation; cage-like structure; de-clad section; fluorescence; gas phase measurement data; good repeatability; high signal-to-noise ratio; intrinsic evanescent wave fibre optic sensor; low-cost portable sensor devices; multimode optical fibre; photodiode detection; quenching; ruthenium complex; short response time; sol-gel coating; sol-gel-derived porous film;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19940578
