Evanescent-wave oxygen sensing using sol-gel-derived porous coatings

Brian D. MacCraith; Colette M. McDonagh; Gerard O'Keeffe; Johannes G. Vos; Brendan O'Kelly; John F. McGilp

doi:10.1117/12.143513

30 April 1993 Evanescent-wave oxygen sensing using sol-gel-derived porous coatings

Brian D. MacCraith, Colette M. McDonagh, Gerard O'Keeffe, Johannes G. Vos, Brendan O'Kelly, John F. McGilp

Proceedings Volume 1796, Chemical, Biochemical, and Environmental Fiber Sensors IV; (1993) https://doi.org/10.1117/12.143513
Event: Fibers '92, 1992, Boston, MA, United States

Abstract

Porous glass coatings produced by the sol-gel process offer a number of advantages in optical sensor applications. In reagent-based chemical sensors they may be used to provide a robust support matrix in which analyte-sensitive dyes may be entrapped and into which the analyte may diffuse. Although distal tip and side coatings are both possible the latter, evanescent wave approach, is more advantageous. These advantages and the benefits of the sol-gel approach are illustrated by preliminary results from an oxygen sensor based on fluorescence quenching of sol-gel-entrapped ruthenium complexes. Declad multimode optical fibers coated with a thin microporous film containing either of two different oxygen-sensitive complexes were investigated. Under evanescent wave excitation the sensors exhibited repeatable quenching behavior when exposed to varying concentrations of oxygen. The oxygen sensitivity was improved by appropriate choice of ruthenium complex and film preparation. The sensors showed good signal-to-noise ratio, fast response time, and low photobleaching.

Citation Download Citation

Brian D. MacCraith, Colette M. McDonagh, Gerard O'Keeffe, Johannes G. Vos, Brendan O'Kelly, and John F. McGilp "Evanescent-wave oxygen sensing using sol-gel-derived porous coatings", Proc. SPIE 1796, Chemical, Biochemical, and Environmental Fiber Sensors IV, (30 April 1993); https://doi.org/10.1117/12.143513

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