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Proceedings Paper

Silica optical fibers for the development of evanescent-wave chemical sensors
Author(s): Vlastimil Matejec; Marie Pospisilova; Daniela Berkova; Miroslav Chomat; Milos Hayer
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Paper Abstract

The paper examines the fabrication and properties of silica optical fibers suitable for the development of evanescent- wave fiber-optic sensors. Attention is given to factors increasing the fraction of power transmitted in the evanescent wave. The effects of the refractive-index profile and fiber bending in the evanescent-wave area and their relation to the sensor sensitivity are investigated. A simple thermometer is developed on the basis of these effects. Approaches for the modification of optical properties in the evanescent-wave area are examined. In this part, porous layers prepared by the sol-gel method based on the silicon and titanium alkoxides and standard polysiloxane polymer coatings are described. The sol-gel derived layers are investigated from the point of view of preparing an optical core with a porous part. The possibilities of controlling the refractive index, as well as absorption coefficient of the coatings by immobilizing pH indicators and Cu2+-phthalocyanine are shown together with examples of using evanescent-wave sensing structures for the detection of organophosphorous compounds and pH measurements.

Paper Details

Date Published: 11 August 1997
PDF: 9 pages
Proc. SPIE 3200, Third Conference on Photonic Systems for Ecological Monitoring, (11 August 1997); doi: 10.1117/12.284722
Show Author Affiliations
Vlastimil Matejec, Institute of Radio Engineering and Electronics (Czech Republic)
Marie Pospisilova, Institute of Radio Engineering and Electronics (Czech Republic)
Daniela Berkova, Institute of Radio Engineering and Electronics (Czech Republic)
Miroslav Chomat, Institute of Radio Engineering and Electronics (Czech Republic)
Milos Hayer, Institute of Radio Engineering and Electronics (Czech Republic)


Published in SPIE Proceedings Vol. 3200:
Third Conference on Photonic Systems for Ecological Monitoring

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