Title :
Fibre optic micro-optrode for dissolved oxygen measurements
Author :
McCulloch, S. ; Uttamchandani, D.
Author_Institution :
Dept. of Electr. Eng., Strathclyde Univ., Glasgow, UK
fDate :
5/1/1999 12:00:00 AM
Abstract :
The paper describes a simple, low-cost technique for producing a highly miniaturised oxygen sensor based on indicator-mediated sensing, and results obtained using this device to monitor dissolved oxygen concentration are reported. The technology is based on the use of submicron optical-fibre tips which have a fluorescent chemical reagent immobilised on their end surface. Fibre tips (0.1-1 μm) were formed by drawing single-mode optical fibre (125 μm outer diameter) in a fusion splicer. Sol-gel films doped with a fluorescent, oxygen-sensitive chemical indicator were then deposited on the end surface of the fibre tip using dip-coating techniques. The sensors thus developed using these coating technologies are reversible and have response times of a few seconds
Keywords :
biosensors; chemical sensors; drawing (mechanical); fibre optic sensors; fluorescence; microsensors; optical fibre fabrication; radiation quenching; sol-gel processing; water pollution measurement; 0.1 to 1 micron; 125 micron; blood oxygen; dip-coating; dissolved oxygen concentration; doped sol-gel films; fibre optic micro-optrode; fluorescence quenching; fluorescent chemical reagent; fusion splicer; immobilised on end surface; indicator-mediated sensing; low-cost technique; medical sensing; miniaturised oxygen sensor; optical microsensors; reversible sensors; single-mode optical fibre drawing; submicron optical-fibre tips; water supply quality;
Journal_Title :
Science, Measurement and Technology, IEE Proceedings -
DOI :
10.1049/ip-smt:19990077
