A distributed fiber optic sensor based on cladding fluorescence
- 1 January 1990
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Journal of Lightwave Technology
- Vol. 8 (2) , 212-220
- https://doi.org/10.1109/50.47873
Abstract
The fiber for the sensor is formed by cladding fused silica during drawing with polydimethyl siloxane into which an organic fluorescent dye, 9, 10-diphenylanthracene, has been dissolved. Upon side illumination at a wavelength within the excitation range of the dye, the cladding fluoresces; some of this fluorescence is coupled into guided modes in the fiber core through the evanescent fields of these modes. In the presence of oxygen, fluorescent emission by the dye is diminished. For the sensor described, the rubbery liquidlike nature of the polydimethyl siloxane cladding allows rapid diffusion of gases, and the intensity of the guided fluorescence is observed to drop by 30% in less than 5 s when the ambient atmosphere changes from pure nitrogen to pure oxygen. The advantages of this sensing technique, and some of the possibilities for new sensors based on this principle, are discussed.Keywords
This publication has 16 references indexed in Scilit:
- Fiber-optic fluorosensor for oxygen and carbon dioxideAnalytical Chemistry, 1988
- Fibre-optic oxygen sensor with the fluorescence decay time as the information carrierAnalytica Chimica Acta, 1988
- Launching light into fiber cores from sources located in the claddingJournal of Lightwave Technology, 1988
- Measurement and analysis of light transmission through a modified cladding optical fiber with applications to sensorsApplied Optics, 1986
- Optical fiber sensor based on differential spectroscopic absorptionApplied Optics, 1985
- Reversible optical waveguide sensor for ammonia vaporsOptics Letters, 1983
- Fiber optic pH probe for physiological useAnalytical Chemistry, 1980
- Diffusion and partitioning of a pesticide, lindane, into phosphatidylcholine bilayersBiochimica et Biophysica Acta (BBA) - Biomembranes, 1977
- Coated optical guides for spectrophotometry of chemical reactionsNature, 1975
- Silicone-clad fused-silica-core fibreElectronics Letters, 1975