A distributed fiber optic sensor based on cladding fluorescence

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 t...

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Veröffentlicht in:Journal of lightwave technology 1990-02, Vol.8 (2), p.212-220
Hauptverfasser: Lieberman, R.A., Blyler, L.L., Cohen, L.G.
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container_title Journal of lightwave technology
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creator Lieberman, R.A.
Blyler, L.L.
Cohen, L.G.
description 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.< >
doi_str_mv 10.1109/50.47873
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subjects Biological and medical sciences
Biosensors
Biotechnology
Chemical sensors
Fluorescence
Fundamental and applied biological sciences. Psychology
Methods. Procedures. Technologies
Optical fiber sensors
Optical fibers
Optical polymers
Optical sensors
Optical surface waves
Optical waveguides
Sensor phenomena and characterization
Silicon compounds
Various methods and equipments
title A distributed fiber optic sensor based on cladding fluorescence
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